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expression", "/versions/11/facts/3/label": "Output", "/versions/11/facts/3/value": "Table-function result tuples", "/versions/11/facts/4/label": "Executor initializer", "/versions/11/facts/5/label": "Memory mechanism", "/versions/11/tables/0/title": "EXPLAIN labels in this source build", "/versions/11/related/1/label": "Using EXPLAIN", "/versions/11/related/2/label": "Parallel plans", "/versions/11/sections/0/title": "EXPLAIN names and attributes", "/versions/11/sections/1/title": "Memory and temporary storage", "/versions/11/sections/2/title": "Parallel execution and instrumentation", "/versions/11/sections/3/title": "Executor implementation notes", "/versions/11/sections/4/title": "EXPLAIN identity in core source", "/versions/11/memory/description": "This node creates a tuplestore with work_mem. The tuplestore can move stored tuples to temporary files; this does not make work_mem a cap on every allocation made by the node.", "/versions/11/sections/0/paragraphs/0": "Structured formats use the Node Type above. Text-format spellings can also include operation, strategy, join type, scan direction or aggregation-stage attributes.", "/versions/11/sections/0/paragraphs/1": "Text names recorded by this source: Table Function Scan.", "/versions/11/sections/0/paragraphs/2": "Parallel-aware and parallel-safe are different plan properties. A node running inside a parallel worker is not necessarily a parallel-aware node.", "/versions/11/sections/1/paragraphs/0": "This node creates a tuplestore with work_mem. The tuplestore can move stored tuples to temporary files; this does not make work_mem a cap on every allocation made by the node.", "/versions/11/sections/2/paragraphs/0": "The source callbacks below can coordinate execution or collect worker instrumentation. Their presence is not a blanket claim that this node supports a shared parallel scan or shared state.", "/versions/11/sections/2/paragraphs/1": "Callbacks in this build: none extracted from this node implementation.", "/versions/11/sections/3/paragraphs/0": "nodeTableFuncscan.c Support routines for scanning RangeTableFunc (XMLTABLE like functions).", "/versions/11/sections/3/paragraphs/1": "If first time through, read all tuples from function and put them in a tuplestore. Subsequent calls just fetch tuples from tuplestore.", "/versions/11/sections/3/paragraphs/2": "TableFuncRecheck -- access method routine to recheck a tuple in EvalPlanQual", "/versions/11/sections/3/paragraphs/3": "Scans the function sequentially and returns the next qualifying tuple. We call the ExecScan() routine and pass it the appropriate access method functions.", "/versions/11/sections/3/paragraphs/4": "Each call to fetch a new set of rows - of which there may be very many if XMLTABLE is being used in a lateral join - will allocate a possibly substantial amount of memory, so we cannot use the per-query context here. perTableCxt now serves the same function as \"argcontext\" does in FunctionScan - a place to store per-one-call (i.e. one result table) lifetime data (as opposed to per-query or per-result-tuple).", "/versions/11/tables/0/columns/0/label": "Text-format label", "/versions/11/tables/0/columns/1/label": "Structured node identity"}, "fallback_fields": [], "source_language": "en", "original_snapshot_sha256": "a128aca58712e740aa7cde3165e2b0b932cb7af82826a360cdea1f73be96261c"}, "evidence_kind": "source and documentation", "explain_names": ["Table Function Scan"], "partial_modes": [], "comparison_data": {"node_tag": "T_TableFuncScan", "strategies": [], 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\u540d\u79f0\u4e0e\u5c5e\u6027", "paragraphs": ["\u7ed3\u6784\u5316\u683c\u5f0f\u4f7f\u7528\u4e0a\u8ff0 Node Type\u3002\u6587\u672c\u683c\u5f0f\u540d\u79f0\u8fd8\u53ef\u80fd\u5305\u542b\u64cd\u4f5c\u3001\u7b56\u7565\u3001\u8fde\u63a5\u7c7b\u578b\u3001\u626b\u63cf\u65b9\u5411\u6216\u805a\u5408\u9636\u6bb5\u5c5e\u6027\u3002", "\u6b64\u6e90\u7801\u8bb0\u5f55\u7684\u6587\u672c\u540d\u79f0\uff1aTable Function Scan.", "\u5e76\u884c\u611f\u77e5\u4e0e\u5e76\u884c\u5b89\u5168\u662f\u4e0d\u540c\u7684\u8ba1\u5212\u5c5e\u6027\u3002\u5728\u5e76\u884c\u5de5\u4f5c\u8fdb\u7a0b\u5185\u8fd0\u884c\u7684\u8282\u70b9\u4e0d\u4e00\u5b9a\u662f\u5e76\u884c\u611f\u77e5\u8282\u70b9\u3002"]}, {"title": "\u5185\u5b58\u4e0e\u4e34\u65f6\u5b58\u50a8", "paragraphs": ["\u6b64\u8282\u70b9\u4f7f\u7528 work_mem \u521b\u5efa tuplestore\u3002tuplestore \u53ef\u4ee5\u5c06\u5b58\u50a8\u7684\u5143\u7ec4\u79fb\u5230\u4e34\u65f6\u6587\u4ef6\uff0c\u4f46\u8fd9\u4e0d\u610f\u5473\u7740 work_mem \u9650\u5236\u4e86\u8282\u70b9\u7684\u5168\u90e8\u5185\u5b58\u5206\u914d\u3002"]}, {"title": "\u5e76\u884c\u6267\u884c\u4e0e\u8fd0\u884c\u4fe1\u606f\u91c7\u96c6", "paragraphs": ["\u4ee5\u4e0b\u6e90\u7801\u56de\u8c03\u53ef\u4ee5\u534f\u8c03\u6267\u884c\u6216\u6536\u96c6\u5de5\u4f5c\u8fdb\u7a0b\u7684\u6d4b\u91cf\u6570\u636e\u3002\u56de\u8c03\u5b58\u5728\u4e0d\u4ee3\u8868\u8be5\u8282\u70b9\u666e\u904d\u652f\u6301\u5171\u4eab\u5e76\u884c\u626b\u63cf\u6216\u5171\u4eab\u72b6\u6001\u3002", "\u6b64\u6784\u5efa\u7684\u56de\u8c03\uff1anone extracted from this node implementation."]}, {"title": "\u6267\u884c\u5668\u5b9e\u73b0\u8bf4\u660e", "paragraphs": ["nodeTableFuncscan.c\uff1a\u652f\u6301\u626b\u63cf RangeTableFunc\uff08\u7c7b\u4f3c XMLTABLE \u7684\u51fd\u6570\uff09\u7684\u4f8b\u7a0b\u3002", "\u9996\u6b21\u6267\u884c\u65f6\uff0c\u4ece\u51fd\u6570\u8bfb\u53d6\u5168\u90e8\u5143\u7ec4\u5e76\u5b58\u5165 tuplestore\uff1b\u540e\u7eed\u8c03\u7528\u53ea\u9700\u4ece tuplestore \u83b7\u53d6\u5143\u7ec4\u3002", "TableFuncRecheck\uff1a\u5728 EvalPlanQual \u4e2d\u91cd\u65b0\u68c0\u67e5\u5143\u7ec4\u7684\u8bbf\u95ee\u65b9\u6cd5\u4f8b\u7a0b\u3002", "\u987a\u5e8f\u626b\u63cf\u51fd\u6570\u5e76\u8fd4\u56de\u4e0b\u4e00\u4e2a\u6ee1\u8db3\u6761\u4ef6\u7684\u5143\u7ec4\u3002\u8c03\u7528 ExecScan() \u5e76\u4f20\u5165\u76f8\u5e94\u7684\u8bbf\u95ee\u65b9\u6cd5\u51fd\u6570\u3002", "\u6bcf\u6b21\u8c03\u7528\u83b7\u53d6\u4e00\u7ec4\u65b0\u884c\u90fd\u53ef\u80fd\u5206\u914d\u5927\u91cf\u5185\u5b58\uff1b\u5f53 XMLTABLE \u7528\u4e8e\u6a2a\u5411\u8fde\u63a5\u65f6\uff0c\u6b64\u7c7b\u8c03\u7528\u53ef\u80fd\u5f88\u591a\uff0c\u56e0\u6b64\u8fd9\u91cc\u4e0d\u80fd\u4f7f\u7528\u67e5\u8be2\u7ea7\u5185\u5b58\u4e0a\u4e0b\u6587\u3002perTableCxt \u73b0\u5728\u627f\u62c5\u4e0e FunctionScan \u4e2d\u201cargcontext\u201d\u76f8\u540c\u7684\u4f5c\u7528\uff0c\u7528\u4e8e\u5b58\u50a8\u751f\u547d\u5468\u671f\u9650\u5b9a\u4e3a\u4e00\u6b21\u8c03\u7528\uff08\u5373\u4e00\u4e2a\u7ed3\u679c\u8868\uff09\u7684\u6570\u636e\uff0c\u800c\u975e\u6574\u4e2a\u67e5\u8be2\u6216\u5355\u4e2a\u7ed3\u679c\u5143\u7ec4\u7684\u6570\u636e\u3002"]}, {"code": "case T_TableFuncScan:\n\t\t\tpname = sname = \"Table Function Scan\";\n\t\t\tbreak;", "title": "\u6838\u5fc3\u6e90\u7801\u4e2d\u7684 EXPLAIN \u6807\u8bc6"}], "strategies": [], "description": ["\u626b\u63cf XMLTABLE \u7b49\u8868\u51fd\u6570\u4ea7\u751f\u7684\u884c\u3002"], "localization": {"status": "complete", "sources": [], "language": "zh", "original_text": {"/versions/12/description/0": "Scans the rows produced by a table function such as XMLTABLE.", "/versions/12/facts/0/label": "Core node tag", "/versions/12/facts/1/label": "Structured EXPLAIN Node Type", "/versions/12/facts/2/label": "Inputs", "/versions/12/facts/2/value": "A table-function expression", "/versions/12/facts/3/label": "Output", "/versions/12/facts/3/value": "Table-function result tuples", "/versions/12/facts/4/label": "Executor initializer", "/versions/12/facts/5/label": "Memory mechanism", "/versions/12/tables/0/title": "EXPLAIN labels in this source build", "/versions/12/related/1/label": "Using EXPLAIN", "/versions/12/related/2/label": "Parallel plans", "/versions/12/sections/0/title": "EXPLAIN names and attributes", "/versions/12/sections/1/title": "Memory and temporary storage", "/versions/12/sections/2/title": "Parallel execution and instrumentation", "/versions/12/sections/3/title": "Executor implementation notes", "/versions/12/sections/4/title": "EXPLAIN identity in core source", "/versions/12/memory/description": "This node creates a tuplestore with work_mem. The tuplestore can move stored tuples to temporary files; this does not make work_mem a cap on every allocation made by the node.", "/versions/12/sections/0/paragraphs/0": "Structured formats use the Node Type above. Text-format spellings can also include operation, strategy, join type, scan direction or aggregation-stage attributes.", "/versions/12/sections/0/paragraphs/1": "Text names recorded by this source: Table Function Scan.", "/versions/12/sections/0/paragraphs/2": "Parallel-aware and parallel-safe are different plan properties. A node running inside a parallel worker is not necessarily a parallel-aware node.", "/versions/12/sections/1/paragraphs/0": "This node creates a tuplestore with work_mem. The tuplestore can move stored tuples to temporary files; this does not make work_mem a cap on every allocation made by the node.", "/versions/12/sections/2/paragraphs/0": "The source callbacks below can coordinate execution or collect worker instrumentation. Their presence is not a blanket claim that this node supports a shared parallel scan or shared state.", "/versions/12/sections/2/paragraphs/1": "Callbacks in this build: none extracted from this node implementation.", "/versions/12/sections/3/paragraphs/0": "nodeTableFuncscan.c Support routines for scanning RangeTableFunc (XMLTABLE like functions).", "/versions/12/sections/3/paragraphs/1": "If first time through, read all tuples from function and put them in a tuplestore. Subsequent calls just fetch tuples from tuplestore.", "/versions/12/sections/3/paragraphs/2": "TableFuncRecheck -- access method routine to recheck a tuple in EvalPlanQual", "/versions/12/sections/3/paragraphs/3": "Scans the function sequentially and returns the next qualifying tuple. We call the ExecScan() routine and pass it the appropriate access method functions.", "/versions/12/sections/3/paragraphs/4": "Each call to fetch a new set of rows - of which there may be very many if XMLTABLE is being used in a lateral join - will allocate a possibly substantial amount of memory, so we cannot use the per-query context here. perTableCxt now serves the same function as \"argcontext\" does in FunctionScan - a place to store per-one-call (i.e. one result table) lifetime data (as opposed to per-query or per-result-tuple).", "/versions/12/tables/0/columns/0/label": "Text-format label", "/versions/12/tables/0/columns/1/label": "Structured node identity"}, "fallback_fields": [], "source_language": "en", "original_snapshot_sha256": "60b2729a5951f563d4137c6f5186744ab2a0ca4ccff58683c754557aac1adcd9"}, "evidence_kind": "source and documentation", "explain_names": ["Table Function Scan"], "partial_modes": [], "comparison_data": {"node_tag": "T_TableFuncScan", "strategies": [], "text_names": ["Table Function Scan"], "initializer": "ExecInitTableFuncScan", "partial_modes": [], "memory_mechanism": "tuplestore", "parallel_callbacks": []}, "comparison_hash": "3af859883351e2772215a6137da127cf425f1c99d9906aeea3a3761c8d60b4c5", "explain_prefixes": ["Parallel"], "runtime_verified": false, "source_inventory": {"explain": "src/backend/commands/explain.c", "executor": "src/backend/executor/execProcnode.c", "implementation": "src/backend/executor/nodeTableFuncscan.c"}, "parallel_callbacks": []}, "13": {"facts": [{"label": "\u6838\u5fc3\u8282\u70b9\u6807\u7b7e", "value": "T_TableFuncScan"}, {"label": "\u7ed3\u6784\u5316 EXPLAIN \u8282\u70b9\u7c7b\u578b", "value": "Table Function Scan"}, {"label": "\u8f93\u5165", "value": "\u8868\u51fd\u6570\u8868\u8fbe\u5f0f"}, {"label": "\u8f93\u51fa", "value": "\u8868\u51fd\u6570\u7ed3\u679c\u5143\u7ec4"}, {"label": "\u6267\u884c\u5668\u521d\u59cb\u5316\u51fd\u6570", "value": "ExecInitTableFuncScan"}, {"label": "\u5185\u5b58\u673a\u5236", "value": "tuplestore"}], "memory": {"evidence": [{"url": "https://ftp.postgresql.org/pub/source/v13.23/postgresql-13.23.tar.bz2", "path": "src/backend/executor/nodeTableFuncscan.c", "label": "src/backend/executor/nodeTableFuncscan.c", "sha256": "fe6ca3ec15944a64aeccf053d6dffff00efbc69f8dd0f38313174b57a192a8a3", "archive_sha256": "6ec3c82726af92b7dec873fa1cdf881eca92a4219787dfad05acb6b10e041fd6"}, {"url": "https://ftp.postgresql.org/pub/source/v13.23/postgresql-13.23.tar.bz2", "path": "src/backend/utils/sort/tuplestore.c", "label": "src/backend/utils/sort/tuplestore.c", "sha256": "4cba6490949d7dd9338b8499fcbb489e84cfd6cda9b98599512eb40bfbde6f9d", "archive_sha256": "6ec3c82726af92b7dec873fa1cdf881eca92a4219787dfad05acb6b10e041fd6"}], "mechanism": "tuplestore", "description": "\u6b64\u8282\u70b9\u4f7f\u7528 work_mem \u521b\u5efa tuplestore\u3002tuplestore \u53ef\u4ee5\u5c06\u5b58\u50a8\u7684\u5143\u7ec4\u79fb\u5230\u4e34\u65f6\u6587\u4ef6\uff0c\u4f46\u8fd9\u4e0d\u610f\u5473\u7740 work_mem \u9650\u5236\u4e86\u8282\u70b9\u7684\u5168\u90e8\u5185\u5b58\u5206\u914d\u3002", "source_notes": []}, "tables": [{"key": "explain-labels", "rows": [{"label": "Table Function Scan", "identity": "Table Function Scan"}], "title": "\u672c\u6784\u5efa\u4e2d\u7684 EXPLAIN \u6807\u7b7e", "columns": [{"key": "label", "label": "\u6587\u672c\u683c\u5f0f\u6807\u7b7e"}, {"key": "identity", "label": "\u7ed3\u6784\u5316\u8282\u70b9\u6807\u8bc6"}]}], "related": [{"url": "/wiki/sql/explain/?v=13", "label": "EXPLAIN"}, {"url": "/docs/13/using-explain.html", "label": "\u4f7f\u7528 EXPLAIN"}, {"url": "/docs/13/parallel-plans.html", "label": "\u5e76\u884c\u8ba1\u5212"}, {"url": "/wiki/guc/work_mem/?v=13", "label": "work_mem"}], "release": {"ref": "PostgreSQL 13.23 source archive", "label": "13.23", "major": "13", "channel": "historical", "revision": "6ec3c82726af92b7dec873fa1cdf881eca92a4219787dfad05acb6b10e041fd6", "source_url": "https://ftp.postgresql.org/pub/source/v13.23/postgresql-13.23.tar.bz2", "source_snapshot_utc": ""}, "sources": [{"url": "https://ftp.postgresql.org/pub/source/v13.23/postgresql-13.23.tar.bz2", "line": 1219, "path": "src/backend/commands/explain.c", "label": "src/backend/commands/explain.c:1219", "sha256": "541713e0e7f1c9cc352c2b6028964d440c19d2678a4463000094c24a88c1e730", "archive_sha256": "6ec3c82726af92b7dec873fa1cdf881eca92a4219787dfad05acb6b10e041fd6"}, {"url": "https://ftp.postgresql.org/pub/source/v13.23/postgresql-13.23.tar.bz2", "line": 252, "path": "src/backend/executor/execProcnode.c", "label": "src/backend/executor/execProcnode.c:252", "sha256": "d085ee99acfa00587e6ade3a1d9f8108a0566beedbbee3f54a50c9fc0cc2e875", "archive_sha256": "6ec3c82726af92b7dec873fa1cdf881eca92a4219787dfad05acb6b10e041fd6"}, {"url": "https://ftp.postgresql.org/pub/source/v13.23/postgresql-13.23.tar.bz2", "path": "src/backend/executor/nodeTableFuncscan.c", "label": "src/backend/executor/nodeTableFuncscan.c", "sha256": "fe6ca3ec15944a64aeccf053d6dffff00efbc69f8dd0f38313174b57a192a8a3", "archive_sha256": "6ec3c82726af92b7dec873fa1cdf881eca92a4219787dfad05acb6b10e041fd6"}, {"url": "https://ftp.postgresql.org/pub/source/v13.23/postgresql-13.23.tar.bz2", "path": "src/include/nodes/plannodes.h", "label": "src/include/nodes/plannodes.h", "sha256": "dcb296833777b02008c4b6bae8e8f7c6423b7ffba21f36702597c9d596d039ab", "archive_sha256": "6ec3c82726af92b7dec873fa1cdf881eca92a4219787dfad05acb6b10e041fd6"}, {"url": "https://ftp.postgresql.org/pub/source/v13.23/postgresql-13.23.tar.bz2", "path": "src/backend/utils/sort/tuplestore.c", "label": "src/backend/utils/sort/tuplestore.c", "sha256": "4cba6490949d7dd9338b8499fcbb489e84cfd6cda9b98599512eb40bfbde6f9d", "archive_sha256": "6ec3c82726af92b7dec873fa1cdf881eca92a4219787dfad05acb6b10e041fd6"}], "node_tag": "T_TableFuncScan", "sections": [{"title": "EXPLAIN \u540d\u79f0\u4e0e\u5c5e\u6027", "paragraphs": ["\u7ed3\u6784\u5316\u683c\u5f0f\u4f7f\u7528\u4e0a\u8ff0 Node Type\u3002\u6587\u672c\u683c\u5f0f\u540d\u79f0\u8fd8\u53ef\u80fd\u5305\u542b\u64cd\u4f5c\u3001\u7b56\u7565\u3001\u8fde\u63a5\u7c7b\u578b\u3001\u626b\u63cf\u65b9\u5411\u6216\u805a\u5408\u9636\u6bb5\u5c5e\u6027\u3002", "\u6b64\u6e90\u7801\u8bb0\u5f55\u7684\u6587\u672c\u540d\u79f0\uff1aTable Function Scan.", "\u5e76\u884c\u611f\u77e5\u4e0e\u5e76\u884c\u5b89\u5168\u662f\u4e0d\u540c\u7684\u8ba1\u5212\u5c5e\u6027\u3002\u5728\u5e76\u884c\u5de5\u4f5c\u8fdb\u7a0b\u5185\u8fd0\u884c\u7684\u8282\u70b9\u4e0d\u4e00\u5b9a\u662f\u5e76\u884c\u611f\u77e5\u8282\u70b9\u3002"]}, {"title": "\u5185\u5b58\u4e0e\u4e34\u65f6\u5b58\u50a8", "paragraphs": ["\u6b64\u8282\u70b9\u4f7f\u7528 work_mem \u521b\u5efa tuplestore\u3002tuplestore \u53ef\u4ee5\u5c06\u5b58\u50a8\u7684\u5143\u7ec4\u79fb\u5230\u4e34\u65f6\u6587\u4ef6\uff0c\u4f46\u8fd9\u4e0d\u610f\u5473\u7740 work_mem \u9650\u5236\u4e86\u8282\u70b9\u7684\u5168\u90e8\u5185\u5b58\u5206\u914d\u3002"]}, {"title": "\u5e76\u884c\u6267\u884c\u4e0e\u8fd0\u884c\u4fe1\u606f\u91c7\u96c6", "paragraphs": ["\u4ee5\u4e0b\u6e90\u7801\u56de\u8c03\u53ef\u4ee5\u534f\u8c03\u6267\u884c\u6216\u6536\u96c6\u5de5\u4f5c\u8fdb\u7a0b\u7684\u6d4b\u91cf\u6570\u636e\u3002\u56de\u8c03\u5b58\u5728\u4e0d\u4ee3\u8868\u8be5\u8282\u70b9\u666e\u904d\u652f\u6301\u5171\u4eab\u5e76\u884c\u626b\u63cf\u6216\u5171\u4eab\u72b6\u6001\u3002", "\u6b64\u6784\u5efa\u7684\u56de\u8c03\uff1anone extracted from this node implementation."]}, {"title": "\u6267\u884c\u5668\u5b9e\u73b0\u8bf4\u660e", "paragraphs": ["nodeTableFuncscan.c\uff1a\u652f\u6301\u626b\u63cf RangeTableFunc\uff08\u7c7b\u4f3c XMLTABLE \u7684\u51fd\u6570\uff09\u7684\u4f8b\u7a0b\u3002", "\u9996\u6b21\u6267\u884c\u65f6\uff0c\u4ece\u51fd\u6570\u8bfb\u53d6\u5168\u90e8\u5143\u7ec4\u5e76\u5b58\u5165 tuplestore\uff1b\u540e\u7eed\u8c03\u7528\u53ea\u9700\u4ece tuplestore \u83b7\u53d6\u5143\u7ec4\u3002", "TableFuncRecheck\uff1a\u5728 EvalPlanQual \u4e2d\u91cd\u65b0\u68c0\u67e5\u5143\u7ec4\u7684\u8bbf\u95ee\u65b9\u6cd5\u4f8b\u7a0b\u3002", "\u987a\u5e8f\u626b\u63cf\u51fd\u6570\u5e76\u8fd4\u56de\u4e0b\u4e00\u4e2a\u6ee1\u8db3\u6761\u4ef6\u7684\u5143\u7ec4\u3002\u8c03\u7528 ExecScan() \u5e76\u4f20\u5165\u76f8\u5e94\u7684\u8bbf\u95ee\u65b9\u6cd5\u51fd\u6570\u3002", "\u6bcf\u6b21\u8c03\u7528\u83b7\u53d6\u4e00\u7ec4\u65b0\u884c\u90fd\u53ef\u80fd\u5206\u914d\u5927\u91cf\u5185\u5b58\uff1b\u5f53 XMLTABLE \u7528\u4e8e\u6a2a\u5411\u8fde\u63a5\u65f6\uff0c\u6b64\u7c7b\u8c03\u7528\u53ef\u80fd\u5f88\u591a\uff0c\u56e0\u6b64\u8fd9\u91cc\u4e0d\u80fd\u4f7f\u7528\u67e5\u8be2\u7ea7\u5185\u5b58\u4e0a\u4e0b\u6587\u3002perTableCxt \u73b0\u5728\u627f\u62c5\u4e0e FunctionScan \u4e2d\u201cargcontext\u201d\u76f8\u540c\u7684\u4f5c\u7528\uff0c\u7528\u4e8e\u5b58\u50a8\u751f\u547d\u5468\u671f\u9650\u5b9a\u4e3a\u4e00\u6b21\u8c03\u7528\uff08\u5373\u4e00\u4e2a\u7ed3\u679c\u8868\uff09\u7684\u6570\u636e\uff0c\u800c\u975e\u6574\u4e2a\u67e5\u8be2\u6216\u5355\u4e2a\u7ed3\u679c\u5143\u7ec4\u7684\u6570\u636e\u3002"]}, {"code": "case T_TableFuncScan:\n\t\t\tpname = sname = \"Table Function Scan\";\n\t\t\tbreak;", "title": "\u6838\u5fc3\u6e90\u7801\u4e2d\u7684 EXPLAIN \u6807\u8bc6"}], "strategies": [], "description": ["\u626b\u63cf XMLTABLE \u7b49\u8868\u51fd\u6570\u4ea7\u751f\u7684\u884c\u3002"], "localization": {"status": "complete", "sources": [], "language": "zh", "original_text": {"/versions/13/description/0": "Scans the rows produced by a table function such as XMLTABLE.", "/versions/13/facts/0/label": "Core node tag", "/versions/13/facts/1/label": "Structured EXPLAIN Node Type", "/versions/13/facts/2/label": "Inputs", "/versions/13/facts/2/value": "A table-function expression", "/versions/13/facts/3/label": "Output", "/versions/13/facts/3/value": "Table-function result tuples", "/versions/13/facts/4/label": "Executor initializer", "/versions/13/facts/5/label": "Memory mechanism", "/versions/13/tables/0/title": "EXPLAIN labels in this source build", "/versions/13/related/1/label": "Using EXPLAIN", "/versions/13/related/2/label": "Parallel plans", "/versions/13/sections/0/title": "EXPLAIN names and attributes", "/versions/13/sections/1/title": "Memory and temporary storage", "/versions/13/sections/2/title": "Parallel execution and instrumentation", "/versions/13/sections/3/title": "Executor implementation notes", "/versions/13/sections/4/title": "EXPLAIN identity in core source", "/versions/13/memory/description": "This node creates a tuplestore with work_mem. The tuplestore can move stored tuples to temporary files; this does not make work_mem a cap on every allocation made by the node.", "/versions/13/sections/0/paragraphs/0": "Structured formats use the Node Type above. Text-format spellings can also include operation, strategy, join type, scan direction or aggregation-stage attributes.", "/versions/13/sections/0/paragraphs/1": "Text names recorded by this source: Table Function Scan.", "/versions/13/sections/0/paragraphs/2": "Parallel-aware and parallel-safe are different plan properties. A node running inside a parallel worker is not necessarily a parallel-aware node.", "/versions/13/sections/1/paragraphs/0": "This node creates a tuplestore with work_mem. The tuplestore can move stored tuples to temporary files; this does not make work_mem a cap on every allocation made by the node.", "/versions/13/sections/2/paragraphs/0": "The source callbacks below can coordinate execution or collect worker instrumentation. Their presence is not a blanket claim that this node supports a shared parallel scan or shared state.", "/versions/13/sections/2/paragraphs/1": "Callbacks in this build: none extracted from this node implementation.", "/versions/13/sections/3/paragraphs/0": "nodeTableFuncscan.c Support routines for scanning RangeTableFunc (XMLTABLE like functions).", "/versions/13/sections/3/paragraphs/1": "If first time through, read all tuples from function and put them in a tuplestore. Subsequent calls just fetch tuples from tuplestore.", "/versions/13/sections/3/paragraphs/2": "TableFuncRecheck -- access method routine to recheck a tuple in EvalPlanQual", "/versions/13/sections/3/paragraphs/3": "Scans the function sequentially and returns the next qualifying tuple. We call the ExecScan() routine and pass it the appropriate access method functions.", "/versions/13/sections/3/paragraphs/4": "Each call to fetch a new set of rows - of which there may be very many if XMLTABLE is being used in a lateral join - will allocate a possibly substantial amount of memory, so we cannot use the per-query context here. perTableCxt now serves the same function as \"argcontext\" does in FunctionScan - a place to store per-one-call (i.e. one result table) lifetime data (as opposed to per-query or per-result-tuple).", "/versions/13/tables/0/columns/0/label": "Text-format label", "/versions/13/tables/0/columns/1/label": "Structured node identity"}, "fallback_fields": [], "source_language": "en", "original_snapshot_sha256": "4f382927583541cd5d6d96ee64acade3503a7a65021c7cbd328078fc0b4ddd94"}, "evidence_kind": "source and documentation", "explain_names": ["Table Function Scan"], "partial_modes": [], "comparison_data": {"node_tag": "T_TableFuncScan", "strategies": [], "text_names": ["Table Function Scan"], "initializer": "ExecInitTableFuncScan", "partial_modes": [], "memory_mechanism": "tuplestore", "parallel_callbacks": []}, "comparison_hash": "3af859883351e2772215a6137da127cf425f1c99d9906aeea3a3761c8d60b4c5", "explain_prefixes": ["Parallel"], "runtime_verified": false, "source_inventory": {"explain": "src/backend/commands/explain.c", "executor": "src/backend/executor/execProcnode.c", "implementation": "src/backend/executor/nodeTableFuncscan.c"}, "parallel_callbacks": []}, "14": {"facts": [{"label": "\u6838\u5fc3\u8282\u70b9\u6807\u7b7e", "value": "T_TableFuncScan"}, {"label": "\u7ed3\u6784\u5316 EXPLAIN \u8282\u70b9\u7c7b\u578b", "value": "Table Function Scan"}, {"label": "\u8f93\u5165", "value": "\u8868\u51fd\u6570\u8868\u8fbe\u5f0f"}, {"label": "\u8f93\u51fa", "value": "\u8868\u51fd\u6570\u7ed3\u679c\u5143\u7ec4"}, {"label": "\u6267\u884c\u5668\u521d\u59cb\u5316\u51fd\u6570", "value": "ExecInitTableFuncScan"}, {"label": "\u5185\u5b58\u673a\u5236", "value": "tuplestore"}], "memory": {"evidence": [{"url": "https://ftp.postgresql.org/pub/source/v14.24/postgresql-14.24.tar.bz2", "path": "src/backend/executor/nodeTableFuncscan.c", "label": "src/backend/executor/nodeTableFuncscan.c", "sha256": "7862ea7ec0e663281ee912dfcb3100a807a1e568bb20cc5081f23499821bc1ed", "archive_sha256": "a7fa7ed3d558172355f51406097a7bd4f6b473be80f311ef7cda96bf383d8897"}, {"url": "https://ftp.postgresql.org/pub/source/v14.24/postgresql-14.24.tar.bz2", "path": "src/backend/utils/sort/tuplestore.c", "label": "src/backend/utils/sort/tuplestore.c", "sha256": "833cff27e0a2c863b9e897cd3bf4127df1b3e3a9b976694f3323a1c1a466d9b2", "archive_sha256": "a7fa7ed3d558172355f51406097a7bd4f6b473be80f311ef7cda96bf383d8897"}], "mechanism": "tuplestore", "description": "\u6b64\u8282\u70b9\u4f7f\u7528 work_mem \u521b\u5efa tuplestore\u3002tuplestore \u53ef\u4ee5\u5c06\u5b58\u50a8\u7684\u5143\u7ec4\u79fb\u5230\u4e34\u65f6\u6587\u4ef6\uff0c\u4f46\u8fd9\u4e0d\u610f\u5473\u7740 work_mem \u9650\u5236\u4e86\u8282\u70b9\u7684\u5168\u90e8\u5185\u5b58\u5206\u914d\u3002", "source_notes": []}, "tables": [{"key": "explain-labels", "rows": [{"label": "Table Function Scan", "identity": "Table Function Scan"}], "title": "\u672c\u6784\u5efa\u4e2d\u7684 EXPLAIN \u6807\u7b7e", "columns": [{"key": "label", "label": "\u6587\u672c\u683c\u5f0f\u6807\u7b7e"}, {"key": "identity", "label": "\u7ed3\u6784\u5316\u8282\u70b9\u6807\u8bc6"}]}], "related": [{"url": "/wiki/sql/explain/?v=14", "label": "EXPLAIN"}, {"url": "/docs/14/using-explain.html", "label": "\u4f7f\u7528 EXPLAIN"}, {"url": "/docs/14/parallel-plans.html", "label": "\u5e76\u884c\u8ba1\u5212"}, {"url": "/wiki/guc/work_mem/?v=14", "label": "work_mem"}], "release": {"ref": "PostgreSQL 14.24 source archive", "label": "14.24", "major": "14", "channel": "stable", "revision": "a7fa7ed3d558172355f51406097a7bd4f6b473be80f311ef7cda96bf383d8897", "source_url": "https://ftp.postgresql.org/pub/source/v14.24/postgresql-14.24.tar.bz2", "source_snapshot_utc": ""}, "sources": [{"url": "https://ftp.postgresql.org/pub/source/v14.24/postgresql-14.24.tar.bz2", "line": 1258, "path": "src/backend/commands/explain.c", "label": "src/backend/commands/explain.c:1258", "sha256": "e091be4e2a083b8dea39ccd09beedede22c1716ef974da66c214a44f48be8c41", "archive_sha256": "a7fa7ed3d558172355f51406097a7bd4f6b473be80f311ef7cda96bf383d8897"}, {"url": "https://ftp.postgresql.org/pub/source/v14.24/postgresql-14.24.tar.bz2", "line": 259, "path": "src/backend/executor/execProcnode.c", "label": "src/backend/executor/execProcnode.c:259", "sha256": "72da1c5ad457f1d92a39ab73531701794df858419e3b89d6e6cb7079634e68fa", "archive_sha256": "a7fa7ed3d558172355f51406097a7bd4f6b473be80f311ef7cda96bf383d8897"}, {"url": "https://ftp.postgresql.org/pub/source/v14.24/postgresql-14.24.tar.bz2", "path": "src/backend/executor/nodeTableFuncscan.c", "label": "src/backend/executor/nodeTableFuncscan.c", "sha256": "7862ea7ec0e663281ee912dfcb3100a807a1e568bb20cc5081f23499821bc1ed", "archive_sha256": "a7fa7ed3d558172355f51406097a7bd4f6b473be80f311ef7cda96bf383d8897"}, {"url": "https://ftp.postgresql.org/pub/source/v14.24/postgresql-14.24.tar.bz2", "path": "src/include/nodes/plannodes.h", "label": "src/include/nodes/plannodes.h", "sha256": "302f51a16b570dba7ec4e7bc045f7df5800d21630280354d1a24025f3baec75d", "archive_sha256": "a7fa7ed3d558172355f51406097a7bd4f6b473be80f311ef7cda96bf383d8897"}, {"url": "https://ftp.postgresql.org/pub/source/v14.24/postgresql-14.24.tar.bz2", "path": "src/backend/utils/sort/tuplestore.c", "label": "src/backend/utils/sort/tuplestore.c", "sha256": "833cff27e0a2c863b9e897cd3bf4127df1b3e3a9b976694f3323a1c1a466d9b2", "archive_sha256": "a7fa7ed3d558172355f51406097a7bd4f6b473be80f311ef7cda96bf383d8897"}], "node_tag": "T_TableFuncScan", "sections": [{"title": "EXPLAIN \u540d\u79f0\u4e0e\u5c5e\u6027", "paragraphs": ["\u7ed3\u6784\u5316\u683c\u5f0f\u4f7f\u7528\u4e0a\u8ff0 Node Type\u3002\u6587\u672c\u683c\u5f0f\u540d\u79f0\u8fd8\u53ef\u80fd\u5305\u542b\u64cd\u4f5c\u3001\u7b56\u7565\u3001\u8fde\u63a5\u7c7b\u578b\u3001\u626b\u63cf\u65b9\u5411\u6216\u805a\u5408\u9636\u6bb5\u5c5e\u6027\u3002", "\u6b64\u6e90\u7801\u8bb0\u5f55\u7684\u6587\u672c\u540d\u79f0\uff1aTable Function Scan.", "\u5e76\u884c\u611f\u77e5\u4e0e\u5e76\u884c\u5b89\u5168\u662f\u4e0d\u540c\u7684\u8ba1\u5212\u5c5e\u6027\u3002\u5728\u5e76\u884c\u5de5\u4f5c\u8fdb\u7a0b\u5185\u8fd0\u884c\u7684\u8282\u70b9\u4e0d\u4e00\u5b9a\u662f\u5e76\u884c\u611f\u77e5\u8282\u70b9\u3002"]}, {"title": "\u5185\u5b58\u4e0e\u4e34\u65f6\u5b58\u50a8", "paragraphs": ["\u6b64\u8282\u70b9\u4f7f\u7528 work_mem \u521b\u5efa tuplestore\u3002tuplestore \u53ef\u4ee5\u5c06\u5b58\u50a8\u7684\u5143\u7ec4\u79fb\u5230\u4e34\u65f6\u6587\u4ef6\uff0c\u4f46\u8fd9\u4e0d\u610f\u5473\u7740 work_mem \u9650\u5236\u4e86\u8282\u70b9\u7684\u5168\u90e8\u5185\u5b58\u5206\u914d\u3002"]}, {"title": "\u5e76\u884c\u6267\u884c\u4e0e\u8fd0\u884c\u4fe1\u606f\u91c7\u96c6", "paragraphs": ["\u4ee5\u4e0b\u6e90\u7801\u56de\u8c03\u53ef\u4ee5\u534f\u8c03\u6267\u884c\u6216\u6536\u96c6\u5de5\u4f5c\u8fdb\u7a0b\u7684\u6d4b\u91cf\u6570\u636e\u3002\u56de\u8c03\u5b58\u5728\u4e0d\u4ee3\u8868\u8be5\u8282\u70b9\u666e\u904d\u652f\u6301\u5171\u4eab\u5e76\u884c\u626b\u63cf\u6216\u5171\u4eab\u72b6\u6001\u3002", "\u6b64\u6784\u5efa\u7684\u56de\u8c03\uff1anone extracted from this node implementation."]}, {"title": "\u6267\u884c\u5668\u5b9e\u73b0\u8bf4\u660e", "paragraphs": ["nodeTableFuncscan.c\uff1a\u652f\u6301\u626b\u63cf RangeTableFunc\uff08\u7c7b\u4f3c XMLTABLE \u7684\u51fd\u6570\uff09\u7684\u4f8b\u7a0b\u3002", "\u9996\u6b21\u6267\u884c\u65f6\uff0c\u4ece\u51fd\u6570\u8bfb\u53d6\u5168\u90e8\u5143\u7ec4\u5e76\u5b58\u5165 tuplestore\uff1b\u540e\u7eed\u8c03\u7528\u53ea\u9700\u4ece tuplestore \u83b7\u53d6\u5143\u7ec4\u3002", "TableFuncRecheck\uff1a\u5728 EvalPlanQual \u4e2d\u91cd\u65b0\u68c0\u67e5\u5143\u7ec4\u7684\u8bbf\u95ee\u65b9\u6cd5\u4f8b\u7a0b\u3002", "\u987a\u5e8f\u626b\u63cf\u51fd\u6570\u5e76\u8fd4\u56de\u4e0b\u4e00\u4e2a\u6ee1\u8db3\u6761\u4ef6\u7684\u5143\u7ec4\u3002\u8c03\u7528 ExecScan() \u5e76\u4f20\u5165\u76f8\u5e94\u7684\u8bbf\u95ee\u65b9\u6cd5\u51fd\u6570\u3002", "\u6bcf\u6b21\u8c03\u7528\u83b7\u53d6\u4e00\u7ec4\u65b0\u884c\u90fd\u53ef\u80fd\u5206\u914d\u5927\u91cf\u5185\u5b58\uff1b\u5f53 XMLTABLE \u7528\u4e8e\u6a2a\u5411\u8fde\u63a5\u65f6\uff0c\u6b64\u7c7b\u8c03\u7528\u53ef\u80fd\u5f88\u591a\uff0c\u56e0\u6b64\u8fd9\u91cc\u4e0d\u80fd\u4f7f\u7528\u67e5\u8be2\u7ea7\u5185\u5b58\u4e0a\u4e0b\u6587\u3002perTableCxt \u73b0\u5728\u627f\u62c5\u4e0e FunctionScan \u4e2d\u201cargcontext\u201d\u76f8\u540c\u7684\u4f5c\u7528\uff0c\u7528\u4e8e\u5b58\u50a8\u751f\u547d\u5468\u671f\u9650\u5b9a\u4e3a\u4e00\u6b21\u8c03\u7528\uff08\u5373\u4e00\u4e2a\u7ed3\u679c\u8868\uff09\u7684\u6570\u636e\uff0c\u800c\u975e\u6574\u4e2a\u67e5\u8be2\u6216\u5355\u4e2a\u7ed3\u679c\u5143\u7ec4\u7684\u6570\u636e\u3002"]}, {"code": "case T_TableFuncScan:\n\t\t\tpname = sname = \"Table Function Scan\";\n\t\t\tbreak;", "title": "\u6838\u5fc3\u6e90\u7801\u4e2d\u7684 EXPLAIN \u6807\u8bc6"}], "strategies": [], "description": ["\u626b\u63cf XMLTABLE \u7b49\u8868\u51fd\u6570\u4ea7\u751f\u7684\u884c\u3002"], "localization": {"status": "complete", "sources": [], "language": "zh", "original_text": {"/versions/14/description/0": "Scans the rows produced by a table function such as XMLTABLE.", "/versions/14/facts/0/label": "Core node tag", "/versions/14/facts/1/label": "Structured EXPLAIN Node Type", "/versions/14/facts/2/label": "Inputs", "/versions/14/facts/2/value": "A table-function expression", "/versions/14/facts/3/label": "Output", "/versions/14/facts/3/value": "Table-function result tuples", "/versions/14/facts/4/label": "Executor initializer", "/versions/14/facts/5/label": "Memory mechanism", "/versions/14/tables/0/title": "EXPLAIN labels in this source build", "/versions/14/related/1/label": "Using EXPLAIN", "/versions/14/related/2/label": "Parallel plans", "/versions/14/sections/0/title": "EXPLAIN names and attributes", "/versions/14/sections/1/title": "Memory and temporary storage", "/versions/14/sections/2/title": "Parallel execution and instrumentation", "/versions/14/sections/3/title": "Executor implementation notes", "/versions/14/sections/4/title": "EXPLAIN identity in core source", "/versions/14/memory/description": "This node creates a tuplestore with work_mem. The tuplestore can move stored tuples to temporary files; this does not make work_mem a cap on every allocation made by the node.", "/versions/14/sections/0/paragraphs/0": "Structured formats use the Node Type above. Text-format spellings can also include operation, strategy, join type, scan direction or aggregation-stage attributes.", "/versions/14/sections/0/paragraphs/1": "Text names recorded by this source: Table Function Scan.", "/versions/14/sections/0/paragraphs/2": "Parallel-aware and parallel-safe are different plan properties. A node running inside a parallel worker is not necessarily a parallel-aware node.", "/versions/14/sections/1/paragraphs/0": "This node creates a tuplestore with work_mem. The tuplestore can move stored tuples to temporary files; this does not make work_mem a cap on every allocation made by the node.", "/versions/14/sections/2/paragraphs/0": "The source callbacks below can coordinate execution or collect worker instrumentation. Their presence is not a blanket claim that this node supports a shared parallel scan or shared state.", "/versions/14/sections/2/paragraphs/1": "Callbacks in this build: none extracted from this node implementation.", "/versions/14/sections/3/paragraphs/0": "nodeTableFuncscan.c Support routines for scanning RangeTableFunc (XMLTABLE like functions).", "/versions/14/sections/3/paragraphs/1": "If first time through, read all tuples from function and put them in a tuplestore. Subsequent calls just fetch tuples from tuplestore.", "/versions/14/sections/3/paragraphs/2": "TableFuncRecheck -- access method routine to recheck a tuple in EvalPlanQual", "/versions/14/sections/3/paragraphs/3": "Scans the function sequentially and returns the next qualifying tuple. We call the ExecScan() routine and pass it the appropriate access method functions.", "/versions/14/sections/3/paragraphs/4": "Each call to fetch a new set of rows - of which there may be very many if XMLTABLE is being used in a lateral join - will allocate a possibly substantial amount of memory, so we cannot use the per-query context here. perTableCxt now serves the same function as \"argcontext\" does in FunctionScan - a place to store per-one-call (i.e. one result table) lifetime data (as opposed to per-query or per-result-tuple).", "/versions/14/tables/0/columns/0/label": "Text-format label", "/versions/14/tables/0/columns/1/label": "Structured node identity"}, "fallback_fields": [], "source_language": "en", "original_snapshot_sha256": "d8077ca03dd1081705a21b62f81490a204decd0b3a22c46a93188a0d0692f67b"}, "evidence_kind": "source and documentation", "explain_names": ["Table Function Scan"], "partial_modes": [], "comparison_data": {"node_tag": "T_TableFuncScan", "strategies": [], 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The tuplestore can move stored tuples to temporary files; this does not make work_mem a cap on every allocation made by the node.", "/versions/15/sections/0/paragraphs/0": "Structured formats use the Node Type above. Text-format spellings can also include operation, strategy, join type, scan direction or aggregation-stage attributes.", "/versions/15/sections/0/paragraphs/1": "Text names recorded by this source: Table Function Scan.", "/versions/15/sections/0/paragraphs/2": "Parallel-aware and parallel-safe are different plan properties. A node running inside a parallel worker is not necessarily a parallel-aware node.", "/versions/15/sections/1/paragraphs/0": "This node creates a tuplestore with work_mem. The tuplestore can move stored tuples to temporary files; this does not make work_mem a cap on every allocation made by the node.", "/versions/15/sections/2/paragraphs/0": "The source callbacks below can coordinate execution or collect worker instrumentation. Their presence is not a blanket claim that this node supports a shared parallel scan or shared state.", "/versions/15/sections/2/paragraphs/1": "Callbacks in this build: none extracted from this node implementation.", "/versions/15/sections/3/paragraphs/0": "nodeTableFuncscan.c Support routines for scanning RangeTableFunc (XMLTABLE like functions).", "/versions/15/sections/3/paragraphs/1": "If first time through, read all tuples from function and put them in a tuplestore. Subsequent calls just fetch tuples from tuplestore.", "/versions/15/sections/3/paragraphs/2": "TableFuncRecheck -- access method routine to recheck a tuple in EvalPlanQual", "/versions/15/sections/3/paragraphs/3": "Scans the function sequentially and returns the next qualifying tuple. 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expression", "/versions/16/facts/3/label": "Output", "/versions/16/facts/3/value": "Table-function result tuples", "/versions/16/facts/4/label": "Executor initializer", "/versions/16/facts/5/label": "Memory mechanism", "/versions/16/tables/0/title": "EXPLAIN labels in this source build", "/versions/16/related/1/label": "Using EXPLAIN", "/versions/16/related/2/label": "Parallel plans", "/versions/16/sections/0/title": "EXPLAIN names and attributes", "/versions/16/sections/1/title": "Memory and temporary storage", "/versions/16/sections/2/title": "Parallel execution and instrumentation", "/versions/16/sections/3/title": "Executor implementation notes", "/versions/16/sections/4/title": "EXPLAIN identity in core source", "/versions/16/memory/description": "This node creates a tuplestore with work_mem. The tuplestore can move stored tuples to temporary files; this does not make work_mem a cap on every allocation made by the node.", "/versions/16/sections/0/paragraphs/0": "Structured formats use the Node Type above. Text-format spellings can also include operation, strategy, join type, scan direction or aggregation-stage attributes.", "/versions/16/sections/0/paragraphs/1": "Text names recorded by this source: Table Function Scan.", "/versions/16/sections/0/paragraphs/2": "Parallel-aware and parallel-safe are different plan properties. A node running inside a parallel worker is not necessarily a parallel-aware node.", "/versions/16/sections/1/paragraphs/0": "This node creates a tuplestore with work_mem. The tuplestore can move stored tuples to temporary files; this does not make work_mem a cap on every allocation made by the node.", "/versions/16/sections/2/paragraphs/0": "The source callbacks below can coordinate execution or collect worker instrumentation. Their presence is not a blanket claim that this node supports a shared parallel scan or shared state.", "/versions/16/sections/2/paragraphs/1": "Callbacks in this build: none extracted from this node implementation.", "/versions/16/sections/3/paragraphs/0": "nodeTableFuncscan.c Support routines for scanning RangeTableFunc (XMLTABLE like functions).", "/versions/16/sections/3/paragraphs/1": "If first time through, read all tuples from function and put them in a tuplestore. Subsequent calls just fetch tuples from tuplestore.", "/versions/16/sections/3/paragraphs/2": "TableFuncRecheck -- access method routine to recheck a tuple in EvalPlanQual", "/versions/16/sections/3/paragraphs/3": "Scans the function sequentially and returns the next qualifying tuple. We call the ExecScan() routine and pass it the appropriate access method functions.", "/versions/16/sections/3/paragraphs/4": "Each call to fetch a new set of rows - of which there may be very many if XMLTABLE is being used in a lateral join - will allocate a possibly substantial amount of memory, so we cannot use the per-query context here. perTableCxt now serves the same function as \"argcontext\" does in FunctionScan - a place to store per-one-call (i.e. one result table) lifetime data (as opposed to per-query or per-result-tuple).", "/versions/16/tables/0/columns/0/label": "Text-format label", "/versions/16/tables/0/columns/1/label": "Structured node identity"}, "fallback_fields": [], "source_language": "en", "original_snapshot_sha256": "4133d6a323d0c4267123a4d3c8b9b7f58450bbcd9084b0b9a07d6b26b79905be"}, "evidence_kind": "source and documentation", "explain_names": ["Table Function Scan"], "partial_modes": [], "comparison_data": {"node_tag": "T_TableFuncScan", "strategies": [], 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\u540d\u79f0\u4e0e\u5c5e\u6027", "paragraphs": ["\u7ed3\u6784\u5316\u683c\u5f0f\u4f7f\u7528\u4e0a\u8ff0 Node Type\u3002\u6587\u672c\u683c\u5f0f\u540d\u79f0\u8fd8\u53ef\u80fd\u5305\u542b\u64cd\u4f5c\u3001\u7b56\u7565\u3001\u8fde\u63a5\u7c7b\u578b\u3001\u626b\u63cf\u65b9\u5411\u6216\u805a\u5408\u9636\u6bb5\u5c5e\u6027\u3002", "\u6b64\u6e90\u7801\u8bb0\u5f55\u7684\u6587\u672c\u540d\u79f0\uff1aTable Function Scan.", "\u5e76\u884c\u611f\u77e5\u4e0e\u5e76\u884c\u5b89\u5168\u662f\u4e0d\u540c\u7684\u8ba1\u5212\u5c5e\u6027\u3002\u5728\u5e76\u884c\u5de5\u4f5c\u8fdb\u7a0b\u5185\u8fd0\u884c\u7684\u8282\u70b9\u4e0d\u4e00\u5b9a\u662f\u5e76\u884c\u611f\u77e5\u8282\u70b9\u3002"]}, {"title": "\u5185\u5b58\u4e0e\u4e34\u65f6\u5b58\u50a8", "paragraphs": ["\u6b64\u8282\u70b9\u4f7f\u7528 work_mem \u521b\u5efa tuplestore\u3002tuplestore \u53ef\u4ee5\u5c06\u5b58\u50a8\u7684\u5143\u7ec4\u79fb\u5230\u4e34\u65f6\u6587\u4ef6\uff0c\u4f46\u8fd9\u4e0d\u610f\u5473\u7740 work_mem \u9650\u5236\u4e86\u8282\u70b9\u7684\u5168\u90e8\u5185\u5b58\u5206\u914d\u3002"]}, {"title": "\u5e76\u884c\u6267\u884c\u4e0e\u8fd0\u884c\u4fe1\u606f\u91c7\u96c6", "paragraphs": ["\u4ee5\u4e0b\u6e90\u7801\u56de\u8c03\u53ef\u4ee5\u534f\u8c03\u6267\u884c\u6216\u6536\u96c6\u5de5\u4f5c\u8fdb\u7a0b\u7684\u6d4b\u91cf\u6570\u636e\u3002\u56de\u8c03\u5b58\u5728\u4e0d\u4ee3\u8868\u8be5\u8282\u70b9\u666e\u904d\u652f\u6301\u5171\u4eab\u5e76\u884c\u626b\u63cf\u6216\u5171\u4eab\u72b6\u6001\u3002", "\u6b64\u6784\u5efa\u7684\u56de\u8c03\uff1anone extracted from this node implementation."]}, {"title": "\u6267\u884c\u5668\u5b9e\u73b0\u8bf4\u660e", "paragraphs": ["nodeTableFuncscan.c\uff1a\u652f\u6301\u626b\u63cf RangeTableFunc\uff08\u7c7b\u4f3c XMLTABLE \u7684\u51fd\u6570\uff09\u7684\u4f8b\u7a0b\u3002", "\u9996\u6b21\u6267\u884c\u65f6\uff0c\u4ece\u51fd\u6570\u8bfb\u53d6\u5168\u90e8\u5143\u7ec4\u5e76\u5b58\u5165 tuplestore\uff1b\u540e\u7eed\u8c03\u7528\u53ea\u9700\u4ece tuplestore \u83b7\u53d6\u5143\u7ec4\u3002", "TableFuncRecheck\uff1a\u5728 EvalPlanQual \u4e2d\u91cd\u65b0\u68c0\u67e5\u5143\u7ec4\u7684\u8bbf\u95ee\u65b9\u6cd5\u4f8b\u7a0b\u3002", "\u987a\u5e8f\u626b\u63cf\u51fd\u6570\u5e76\u8fd4\u56de\u4e0b\u4e00\u4e2a\u6ee1\u8db3\u6761\u4ef6\u7684\u5143\u7ec4\u3002\u8c03\u7528 ExecScan() \u5e76\u4f20\u5165\u76f8\u5e94\u7684\u8bbf\u95ee\u65b9\u6cd5\u51fd\u6570\u3002", "\u6bcf\u6b21\u8c03\u7528\u83b7\u53d6\u4e00\u7ec4\u65b0\u884c\u90fd\u53ef\u80fd\u5206\u914d\u5927\u91cf\u5185\u5b58\uff1b\u5f53 XMLTABLE \u6216 JSON_TABLE \u7528\u4e8e\u6a2a\u5411\u8fde\u63a5\u65f6\uff0c\u6b64\u7c7b\u8c03\u7528\u53ef\u80fd\u5f88\u591a\uff0c\u56e0\u6b64\u8fd9\u91cc\u4e0d\u80fd\u4f7f\u7528\u67e5\u8be2\u7ea7\u5185\u5b58\u4e0a\u4e0b\u6587\u3002perTableCxt \u73b0\u5728\u627f\u62c5\u4e0e FunctionScan \u4e2d\u201cargcontext\u201d\u76f8\u540c\u7684\u4f5c\u7528\uff0c\u7528\u4e8e\u5b58\u50a8\u751f\u547d\u5468\u671f\u9650\u5b9a\u4e3a\u4e00\u6b21\u8c03\u7528\uff08\u5373\u4e00\u4e2a\u7ed3\u679c\u8868\uff09\u7684\u6570\u636e\uff0c\u800c\u975e\u6574\u4e2a\u67e5\u8be2\u6216\u5355\u4e2a\u7ed3\u679c\u5143\u7ec4\u7684\u6570\u636e\u3002"]}, {"code": "case T_TableFuncScan:\n\t\t\tpname = sname = \"Table Function Scan\";\n\t\t\tbreak;", "title": "\u6838\u5fc3\u6e90\u7801\u4e2d\u7684 EXPLAIN \u6807\u8bc6"}], "strategies": [], "description": ["\u626b\u63cf XMLTABLE \u7b49\u8868\u51fd\u6570\u4ea7\u751f\u7684\u884c\u3002"], "localization": {"status": "complete", "sources": [], "language": "zh", "original_text": {"/versions/17/description/0": "Scans the rows produced by a table function such as XMLTABLE.", "/versions/17/facts/0/label": "Core node tag", "/versions/17/facts/1/label": "Structured EXPLAIN Node Type", "/versions/17/facts/2/label": "Inputs", "/versions/17/facts/2/value": "A table-function expression", "/versions/17/facts/3/label": "Output", "/versions/17/facts/3/value": "Table-function result tuples", "/versions/17/facts/4/label": "Executor initializer", "/versions/17/facts/5/label": "Memory mechanism", "/versions/17/tables/0/title": "EXPLAIN labels in this source build", "/versions/17/related/1/label": "Using EXPLAIN", "/versions/17/related/2/label": "Parallel plans", "/versions/17/sections/0/title": "EXPLAIN names and attributes", "/versions/17/sections/1/title": "Memory and temporary storage", "/versions/17/sections/2/title": "Parallel execution and instrumentation", "/versions/17/sections/3/title": "Executor implementation notes", "/versions/17/sections/4/title": "EXPLAIN identity in core source", "/versions/17/memory/description": "This node creates a tuplestore with work_mem. The tuplestore can move stored tuples to temporary files; this does not make work_mem a cap on every allocation made by the node.", "/versions/17/sections/0/paragraphs/0": "Structured formats use the Node Type above. Text-format spellings can also include operation, strategy, join type, scan direction or aggregation-stage attributes.", "/versions/17/sections/0/paragraphs/1": "Text names recorded by this source: Table Function Scan.", "/versions/17/sections/0/paragraphs/2": "Parallel-aware and parallel-safe are different plan properties. A node running inside a parallel worker is not necessarily a parallel-aware node.", "/versions/17/sections/1/paragraphs/0": "This node creates a tuplestore with work_mem. The tuplestore can move stored tuples to temporary files; this does not make work_mem a cap on every allocation made by the node.", "/versions/17/sections/2/paragraphs/0": "The source callbacks below can coordinate execution or collect worker instrumentation. Their presence is not a blanket claim that this node supports a shared parallel scan or shared state.", "/versions/17/sections/2/paragraphs/1": "Callbacks in this build: none extracted from this node implementation.", "/versions/17/sections/3/paragraphs/0": "nodeTableFuncscan.c Support routines for scanning RangeTableFunc (XMLTABLE like functions).", "/versions/17/sections/3/paragraphs/1": "If first time through, read all tuples from function and put them in a tuplestore. Subsequent calls just fetch tuples from tuplestore.", "/versions/17/sections/3/paragraphs/2": "TableFuncRecheck -- access method routine to recheck a tuple in EvalPlanQual", "/versions/17/sections/3/paragraphs/3": "Scans the function sequentially and returns the next qualifying tuple. We call the ExecScan() routine and pass it the appropriate access method functions.", "/versions/17/sections/3/paragraphs/4": "Each call to fetch a new set of rows - of which there may be very many if XMLTABLE or JSON_TABLE is being used in a lateral join - will allocate a possibly substantial amount of memory, so we cannot use the per-query context here. perTableCxt now serves the same function as \"argcontext\" does in FunctionScan - a place to store per-one-call (i.e. one result table) lifetime data (as opposed to per-query or per-result-tuple).", "/versions/17/tables/0/columns/0/label": "Text-format label", "/versions/17/tables/0/columns/1/label": "Structured node identity"}, "fallback_fields": [], "source_language": "en", "original_snapshot_sha256": "150b1fd9641cdc9b3a93ca5c57dffd686f22301a12729428d42be52fe5623622"}, "evidence_kind": "source and documentation", "explain_names": ["Table Function Scan"], "partial_modes": [], "comparison_data": {"node_tag": "T_TableFuncScan", 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{"label": "\u5185\u5b58\u673a\u5236", "value": "tuplestore"}], "memory": {"evidence": [{"url": "https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2", "path": "src/backend/executor/nodeTableFuncscan.c", "label": "src/backend/executor/nodeTableFuncscan.c", "sha256": "0a9faaa9e45bb460dd98e4688f088711d459333eb8bd94255779f2c0218df82b", "archive_sha256": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}, {"url": "https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2", "path": "src/backend/utils/sort/tuplestore.c", "label": "src/backend/utils/sort/tuplestore.c", "sha256": "27a85416bafed557006c705ab5d0c5dce3d3c1702812bb54d136f2ac4c41055a", "archive_sha256": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}], "mechanism": "tuplestore", "description": "\u6b64\u8282\u70b9\u4f7f\u7528 work_mem \u521b\u5efa tuplestore\u3002tuplestore \u53ef\u4ee5\u5c06\u5b58\u50a8\u7684\u5143\u7ec4\u79fb\u5230\u4e34\u65f6\u6587\u4ef6\uff0c\u4f46\u8fd9\u4e0d\u610f\u5473\u7740 work_mem \u9650\u5236\u4e86\u8282\u70b9\u7684\u5168\u90e8\u5185\u5b58\u5206\u914d\u3002", "source_notes": []}, "tables": [{"key": "explain-labels", "rows": [{"label": "Table Function Scan", "identity": "Table Function Scan"}], "title": "\u672c\u6784\u5efa\u4e2d\u7684 EXPLAIN \u6807\u7b7e", "columns": [{"key": "label", "label": "\u6587\u672c\u683c\u5f0f\u6807\u7b7e"}, {"key": "identity", "label": "\u7ed3\u6784\u5316\u8282\u70b9\u6807\u8bc6"}]}], "related": [{"url": "/wiki/sql/explain/?v=18", "label": "EXPLAIN"}, {"url": "/docs/18/using-explain.html", "label": "\u4f7f\u7528 EXPLAIN"}, {"url": "/docs/18/parallel-plans.html", "label": "\u5e76\u884c\u8ba1\u5212"}, {"url": "/wiki/guc/work_mem/?v=18", "label": "work_mem"}], "release": {"ref": "PostgreSQL 18.6 source archive", "label": "18.6", "major": "18", "channel": "stable", "revision": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f", "source_url": "https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2", "source_snapshot_utc": ""}, "sources": [{"url": "https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2", "line": 1468, "path": "src/backend/commands/explain.c", "label": "src/backend/commands/explain.c:1468", "sha256": "34c86d6070224a0e981efef51f79101d6d505e5874f1684ace183034bab14bb4", "archive_sha256": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}, {"url": "https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2", "line": 259, "path": "src/backend/executor/execProcnode.c", "label": "src/backend/executor/execProcnode.c:259", "sha256": "f8a06a3f539077249b20664b2812433db6d7bd12b2c0ca633525db43d06f112a", "archive_sha256": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}, {"url": "https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2", "path": "src/backend/executor/nodeTableFuncscan.c", "label": "src/backend/executor/nodeTableFuncscan.c", "sha256": "0a9faaa9e45bb460dd98e4688f088711d459333eb8bd94255779f2c0218df82b", "archive_sha256": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}, {"url": "https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2", "path": "src/include/nodes/plannodes.h", "label": "src/include/nodes/plannodes.h", "sha256": "52422b327a8049fbbb20d8b96008a0fc0a6fafa60f7eff3c695d5b2e83830120", "archive_sha256": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}, {"url": "https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2", "path": "src/backend/utils/sort/tuplestore.c", "label": "src/backend/utils/sort/tuplestore.c", "sha256": "27a85416bafed557006c705ab5d0c5dce3d3c1702812bb54d136f2ac4c41055a", "archive_sha256": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}], "node_tag": "T_TableFuncScan", "sections": [{"title": "EXPLAIN \u540d\u79f0\u4e0e\u5c5e\u6027", "paragraphs": ["\u7ed3\u6784\u5316\u683c\u5f0f\u4f7f\u7528\u4e0a\u8ff0 Node Type\u3002\u6587\u672c\u683c\u5f0f\u540d\u79f0\u8fd8\u53ef\u80fd\u5305\u542b\u64cd\u4f5c\u3001\u7b56\u7565\u3001\u8fde\u63a5\u7c7b\u578b\u3001\u626b\u63cf\u65b9\u5411\u6216\u805a\u5408\u9636\u6bb5\u5c5e\u6027\u3002", "\u6b64\u6e90\u7801\u8bb0\u5f55\u7684\u6587\u672c\u540d\u79f0\uff1aTable Function Scan.", "\u5e76\u884c\u611f\u77e5\u4e0e\u5e76\u884c\u5b89\u5168\u662f\u4e0d\u540c\u7684\u8ba1\u5212\u5c5e\u6027\u3002\u5728\u5e76\u884c\u5de5\u4f5c\u8fdb\u7a0b\u5185\u8fd0\u884c\u7684\u8282\u70b9\u4e0d\u4e00\u5b9a\u662f\u5e76\u884c\u611f\u77e5\u8282\u70b9\u3002"]}, {"title": "\u5185\u5b58\u4e0e\u4e34\u65f6\u5b58\u50a8", "paragraphs": ["\u6b64\u8282\u70b9\u4f7f\u7528 work_mem \u521b\u5efa tuplestore\u3002tuplestore \u53ef\u4ee5\u5c06\u5b58\u50a8\u7684\u5143\u7ec4\u79fb\u5230\u4e34\u65f6\u6587\u4ef6\uff0c\u4f46\u8fd9\u4e0d\u610f\u5473\u7740 work_mem \u9650\u5236\u4e86\u8282\u70b9\u7684\u5168\u90e8\u5185\u5b58\u5206\u914d\u3002"]}, {"title": "\u5e76\u884c\u6267\u884c\u4e0e\u8fd0\u884c\u4fe1\u606f\u91c7\u96c6", "paragraphs": ["\u4ee5\u4e0b\u6e90\u7801\u56de\u8c03\u53ef\u4ee5\u534f\u8c03\u6267\u884c\u6216\u6536\u96c6\u5de5\u4f5c\u8fdb\u7a0b\u7684\u6d4b\u91cf\u6570\u636e\u3002\u56de\u8c03\u5b58\u5728\u4e0d\u4ee3\u8868\u8be5\u8282\u70b9\u666e\u904d\u652f\u6301\u5171\u4eab\u5e76\u884c\u626b\u63cf\u6216\u5171\u4eab\u72b6\u6001\u3002", "\u6b64\u6784\u5efa\u7684\u56de\u8c03\uff1anone extracted from this node implementation."]}, {"title": "\u6267\u884c\u5668\u5b9e\u73b0\u8bf4\u660e", "paragraphs": ["nodeTableFuncscan.c\uff1a\u652f\u6301\u626b\u63cf RangeTableFunc\uff08\u7c7b\u4f3c XMLTABLE \u7684\u51fd\u6570\uff09\u7684\u4f8b\u7a0b\u3002", "\u9996\u6b21\u6267\u884c\u65f6\uff0c\u4ece\u51fd\u6570\u8bfb\u53d6\u5168\u90e8\u5143\u7ec4\u5e76\u5b58\u5165 tuplestore\uff1b\u540e\u7eed\u8c03\u7528\u53ea\u9700\u4ece tuplestore \u83b7\u53d6\u5143\u7ec4\u3002", "TableFuncRecheck\uff1a\u5728 EvalPlanQual \u4e2d\u91cd\u65b0\u68c0\u67e5\u5143\u7ec4\u7684\u8bbf\u95ee\u65b9\u6cd5\u4f8b\u7a0b\u3002", "\u987a\u5e8f\u626b\u63cf\u51fd\u6570\u5e76\u8fd4\u56de\u4e0b\u4e00\u4e2a\u6ee1\u8db3\u6761\u4ef6\u7684\u5143\u7ec4\u3002\u8c03\u7528 ExecScan() \u5e76\u4f20\u5165\u76f8\u5e94\u7684\u8bbf\u95ee\u65b9\u6cd5\u51fd\u6570\u3002", "\u6bcf\u6b21\u8c03\u7528\u83b7\u53d6\u4e00\u7ec4\u65b0\u884c\u90fd\u53ef\u80fd\u5206\u914d\u5927\u91cf\u5185\u5b58\uff1b\u5f53 XMLTABLE \u6216 JSON_TABLE \u7528\u4e8e\u6a2a\u5411\u8fde\u63a5\u65f6\uff0c\u6b64\u7c7b\u8c03\u7528\u53ef\u80fd\u5f88\u591a\uff0c\u56e0\u6b64\u8fd9\u91cc\u4e0d\u80fd\u4f7f\u7528\u67e5\u8be2\u7ea7\u5185\u5b58\u4e0a\u4e0b\u6587\u3002perTableCxt \u73b0\u5728\u627f\u62c5\u4e0e FunctionScan \u4e2d\u201cargcontext\u201d\u76f8\u540c\u7684\u4f5c\u7528\uff0c\u7528\u4e8e\u5b58\u50a8\u751f\u547d\u5468\u671f\u9650\u5b9a\u4e3a\u4e00\u6b21\u8c03\u7528\uff08\u5373\u4e00\u4e2a\u7ed3\u679c\u8868\uff09\u7684\u6570\u636e\uff0c\u800c\u975e\u6574\u4e2a\u67e5\u8be2\u6216\u5355\u4e2a\u7ed3\u679c\u5143\u7ec4\u7684\u6570\u636e\u3002"]}, {"code": "case T_TableFuncScan:\n\t\t\tpname = sname = \"Table Function Scan\";\n\t\t\tbreak;", "title": "\u6838\u5fc3\u6e90\u7801\u4e2d\u7684 EXPLAIN \u6807\u8bc6"}], "strategies": [], "description": ["\u626b\u63cf XMLTABLE \u7b49\u8868\u51fd\u6570\u4ea7\u751f\u7684\u884c\u3002"], "localization": {"status": "complete", "sources": [], "language": "zh", "original_text": {"/versions/18/description/0": "Scans the rows produced by a table function such as XMLTABLE.", "/versions/18/facts/0/label": "Core node tag", "/versions/18/facts/1/label": "Structured EXPLAIN Node Type", "/versions/18/facts/2/label": "Inputs", "/versions/18/facts/2/value": "A table-function expression", "/versions/18/facts/3/label": "Output", "/versions/18/facts/3/value": "Table-function result tuples", "/versions/18/facts/4/label": "Executor initializer", "/versions/18/facts/5/label": "Memory mechanism", "/versions/18/tables/0/title": "EXPLAIN labels in this source build", "/versions/18/related/1/label": "Using EXPLAIN", "/versions/18/related/2/label": "Parallel plans", "/versions/18/sections/0/title": "EXPLAIN names and attributes", "/versions/18/sections/1/title": "Memory and temporary storage", "/versions/18/sections/2/title": "Parallel execution and instrumentation", "/versions/18/sections/3/title": "Executor implementation notes", "/versions/18/sections/4/title": "EXPLAIN identity in core source", "/versions/18/memory/description": "This node creates a tuplestore with work_mem. The tuplestore can move stored tuples to temporary files; this does not make work_mem a cap on every allocation made by the node.", "/versions/18/sections/0/paragraphs/0": "Structured formats use the Node Type above. Text-format spellings can also include operation, strategy, join type, scan direction or aggregation-stage attributes.", "/versions/18/sections/0/paragraphs/1": "Text names recorded by this source: Table Function Scan.", "/versions/18/sections/0/paragraphs/2": "Parallel-aware and parallel-safe are different plan properties. A node running inside a parallel worker is not necessarily a parallel-aware node.", "/versions/18/sections/1/paragraphs/0": "This node creates a tuplestore with work_mem. The tuplestore can move stored tuples to temporary files; this does not make work_mem a cap on every allocation made by the node.", "/versions/18/sections/2/paragraphs/0": "The source callbacks below can coordinate execution or collect worker instrumentation. Their presence is not a blanket claim that this node supports a shared parallel scan or shared state.", "/versions/18/sections/2/paragraphs/1": "Callbacks in this build: none extracted from this node implementation.", "/versions/18/sections/3/paragraphs/0": "nodeTableFuncscan.c Support routines for scanning RangeTableFunc (XMLTABLE like functions).", "/versions/18/sections/3/paragraphs/1": "If first time through, read all tuples from function and put them in a tuplestore. Subsequent calls just fetch tuples from tuplestore.", "/versions/18/sections/3/paragraphs/2": "TableFuncRecheck -- access method routine to recheck a tuple in EvalPlanQual", "/versions/18/sections/3/paragraphs/3": "Scans the function sequentially and returns the next qualifying tuple. We call the ExecScan() routine and pass it the appropriate access method functions.", "/versions/18/sections/3/paragraphs/4": "Each call to fetch a new set of rows - of which there may be very many if XMLTABLE or JSON_TABLE is being used in a lateral join - will allocate a possibly substantial amount of memory, so we cannot use the per-query context here. perTableCxt now serves the same function as \"argcontext\" does in FunctionScan - a place to store per-one-call (i.e. one result table) lifetime data (as opposed to per-query or per-result-tuple).", "/versions/18/tables/0/columns/0/label": "Text-format label", "/versions/18/tables/0/columns/1/label": "Structured node identity"}, "fallback_fields": [], "source_language": "en", "original_snapshot_sha256": "1674845b281805f73bce62eea7e503b81192495879b3ad27b672da42323a2566"}, "evidence_kind": "source and documentation", "explain_names": ["Table Function Scan"], "partial_modes": [], "comparison_data": {"node_tag": "T_TableFuncScan", 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\u53ef\u4ee5\u5c06\u5b58\u50a8\u7684\u5143\u7ec4\u79fb\u5230\u4e34\u65f6\u6587\u4ef6\uff0c\u4f46\u8fd9\u4e0d\u610f\u5473\u7740 work_mem \u9650\u5236\u4e86\u8282\u70b9\u7684\u5168\u90e8\u5185\u5b58\u5206\u914d\u3002", "source_notes": []}, "tables": [{"key": "explain-labels", "rows": [{"label": "Table Function Scan", "identity": "Table Function Scan"}], "title": "\u672c\u6784\u5efa\u4e2d\u7684 EXPLAIN \u6807\u7b7e", "columns": [{"key": "label", "label": "\u6587\u672c\u683c\u5f0f\u6807\u7b7e"}, {"key": "identity", "label": "\u7ed3\u6784\u5316\u8282\u70b9\u6807\u8bc6"}]}], "related": [{"url": "/wiki/sql/explain/?v=19", "label": "EXPLAIN"}, {"url": "/docs/19/using-explain.html", "label": "\u4f7f\u7528 EXPLAIN"}, {"url": "/docs/19/parallel-plans.html", "label": "\u5e76\u884c\u8ba1\u5212"}, {"url": "/wiki/guc/work_mem/?v=19", "label": "work_mem"}], "release": {"ref": "PostgreSQL 19beta4 source archive", "label": "19beta4", "major": "19", "channel": "preview", "revision": "83157ee9c599d03b2f7a3d73ef3a56ec24e0e79cc2b3501a64d1364f56398c86", "source_url": "https://ftp.postgresql.org/pub/source/v19beta4/postgresql-19beta4.tar.bz2", "source_snapshot_utc": ""}, "sources": [{"url": "https://ftp.postgresql.org/pub/source/v19beta4/postgresql-19beta4.tar.bz2", "line": 1480, "path": "src/backend/commands/explain.c", "label": "src/backend/commands/explain.c:1480", "sha256": "8b115b1c194a4b54ae630209a741e293b1df49a9052f10b2de9ca092a48998e3", "archive_sha256": "83157ee9c599d03b2f7a3d73ef3a56ec24e0e79cc2b3501a64d1364f56398c86"}, {"url": "https://ftp.postgresql.org/pub/source/v19beta4/postgresql-19beta4.tar.bz2", "line": 259, "path": "src/backend/executor/execProcnode.c", "label": "src/backend/executor/execProcnode.c:259", "sha256": "5e39b2037bed672da55104229ecc32da5abde44c26bcad01479edcfa044d09ed", "archive_sha256": "83157ee9c599d03b2f7a3d73ef3a56ec24e0e79cc2b3501a64d1364f56398c86"}, {"url": "https://ftp.postgresql.org/pub/source/v19beta4/postgresql-19beta4.tar.bz2", "path": "src/backend/executor/nodeTableFuncscan.c", "label": "src/backend/executor/nodeTableFuncscan.c", "sha256": "1e5e0e709dd7ce8128e8d0d0923516bcb1fc7c4970889b82cd041821ed41bb12", "archive_sha256": "83157ee9c599d03b2f7a3d73ef3a56ec24e0e79cc2b3501a64d1364f56398c86"}, {"url": "https://ftp.postgresql.org/pub/source/v19beta4/postgresql-19beta4.tar.bz2", "path": "src/include/nodes/plannodes.h", "label": "src/include/nodes/plannodes.h", "sha256": "1c65d5d6b6c81c71531685843647869bcae630779d815a5036b06e070c6c06c7", "archive_sha256": "83157ee9c599d03b2f7a3d73ef3a56ec24e0e79cc2b3501a64d1364f56398c86"}, {"url": "https://ftp.postgresql.org/pub/source/v19beta4/postgresql-19beta4.tar.bz2", "path": "src/backend/utils/sort/tuplestore.c", "label": "src/backend/utils/sort/tuplestore.c", "sha256": "cda3af245b88d079a32616b4cc5316913d349ba3acaab5fc1fd8aec479cc51ee", "archive_sha256": "83157ee9c599d03b2f7a3d73ef3a56ec24e0e79cc2b3501a64d1364f56398c86"}], "node_tag": "T_TableFuncScan", "sections": [{"title": "EXPLAIN \u540d\u79f0\u4e0e\u5c5e\u6027", "paragraphs": ["\u7ed3\u6784\u5316\u683c\u5f0f\u4f7f\u7528\u4e0a\u8ff0 Node Type\u3002\u6587\u672c\u683c\u5f0f\u540d\u79f0\u8fd8\u53ef\u80fd\u5305\u542b\u64cd\u4f5c\u3001\u7b56\u7565\u3001\u8fde\u63a5\u7c7b\u578b\u3001\u626b\u63cf\u65b9\u5411\u6216\u805a\u5408\u9636\u6bb5\u5c5e\u6027\u3002", "\u6b64\u6e90\u7801\u8bb0\u5f55\u7684\u6587\u672c\u540d\u79f0\uff1aTable Function Scan.", "\u5e76\u884c\u611f\u77e5\u4e0e\u5e76\u884c\u5b89\u5168\u662f\u4e0d\u540c\u7684\u8ba1\u5212\u5c5e\u6027\u3002\u5728\u5e76\u884c\u5de5\u4f5c\u8fdb\u7a0b\u5185\u8fd0\u884c\u7684\u8282\u70b9\u4e0d\u4e00\u5b9a\u662f\u5e76\u884c\u611f\u77e5\u8282\u70b9\u3002"]}, {"title": "\u5185\u5b58\u4e0e\u4e34\u65f6\u5b58\u50a8", "paragraphs": ["\u6b64\u8282\u70b9\u4f7f\u7528 work_mem \u521b\u5efa tuplestore\u3002tuplestore \u53ef\u4ee5\u5c06\u5b58\u50a8\u7684\u5143\u7ec4\u79fb\u5230\u4e34\u65f6\u6587\u4ef6\uff0c\u4f46\u8fd9\u4e0d\u610f\u5473\u7740 work_mem \u9650\u5236\u4e86\u8282\u70b9\u7684\u5168\u90e8\u5185\u5b58\u5206\u914d\u3002"]}, {"title": "\u5e76\u884c\u6267\u884c\u4e0e\u8fd0\u884c\u4fe1\u606f\u91c7\u96c6", "paragraphs": ["\u4ee5\u4e0b\u6e90\u7801\u56de\u8c03\u53ef\u4ee5\u534f\u8c03\u6267\u884c\u6216\u6536\u96c6\u5de5\u4f5c\u8fdb\u7a0b\u7684\u6d4b\u91cf\u6570\u636e\u3002\u56de\u8c03\u5b58\u5728\u4e0d\u4ee3\u8868\u8be5\u8282\u70b9\u666e\u904d\u652f\u6301\u5171\u4eab\u5e76\u884c\u626b\u63cf\u6216\u5171\u4eab\u72b6\u6001\u3002", "\u6b64\u6784\u5efa\u7684\u56de\u8c03\uff1anone extracted from this node implementation."]}, {"title": "\u6267\u884c\u5668\u5b9e\u73b0\u8bf4\u660e", "paragraphs": ["nodeTableFuncscan.c\uff1a\u652f\u6301\u626b\u63cf RangeTableFunc\uff08\u7c7b\u4f3c XMLTABLE \u7684\u51fd\u6570\uff09\u7684\u4f8b\u7a0b\u3002", "\u9996\u6b21\u6267\u884c\u65f6\uff0c\u4ece\u51fd\u6570\u8bfb\u53d6\u5168\u90e8\u5143\u7ec4\u5e76\u5b58\u5165 tuplestore\uff1b\u540e\u7eed\u8c03\u7528\u53ea\u9700\u4ece tuplestore \u83b7\u53d6\u5143\u7ec4\u3002", "TableFuncRecheck\uff1a\u5728 EvalPlanQual \u4e2d\u91cd\u65b0\u68c0\u67e5\u5143\u7ec4\u7684\u8bbf\u95ee\u65b9\u6cd5\u4f8b\u7a0b\u3002", "\u987a\u5e8f\u626b\u63cf\u51fd\u6570\u5e76\u8fd4\u56de\u4e0b\u4e00\u4e2a\u6ee1\u8db3\u6761\u4ef6\u7684\u5143\u7ec4\u3002\u8c03\u7528 ExecScan() \u5e76\u4f20\u5165\u76f8\u5e94\u7684\u8bbf\u95ee\u65b9\u6cd5\u51fd\u6570\u3002", "\u6bcf\u6b21\u8c03\u7528\u83b7\u53d6\u4e00\u7ec4\u65b0\u884c\u90fd\u53ef\u80fd\u5206\u914d\u5927\u91cf\u5185\u5b58\uff1b\u5f53 XMLTABLE \u6216 JSON_TABLE \u7528\u4e8e\u6a2a\u5411\u8fde\u63a5\u65f6\uff0c\u6b64\u7c7b\u8c03\u7528\u53ef\u80fd\u5f88\u591a\uff0c\u56e0\u6b64\u8fd9\u91cc\u4e0d\u80fd\u4f7f\u7528\u67e5\u8be2\u7ea7\u5185\u5b58\u4e0a\u4e0b\u6587\u3002perTableCxt \u73b0\u5728\u627f\u62c5\u4e0e FunctionScan \u4e2d\u201cargcontext\u201d\u76f8\u540c\u7684\u4f5c\u7528\uff0c\u7528\u4e8e\u5b58\u50a8\u751f\u547d\u5468\u671f\u9650\u5b9a\u4e3a\u4e00\u6b21\u8c03\u7528\uff08\u5373\u4e00\u4e2a\u7ed3\u679c\u8868\uff09\u7684\u6570\u636e\uff0c\u800c\u975e\u6574\u4e2a\u67e5\u8be2\u6216\u5355\u4e2a\u7ed3\u679c\u5143\u7ec4\u7684\u6570\u636e\u3002"]}, {"code": "case T_TableFuncScan:\n\t\t\tpname = sname = \"Table Function Scan\";\n\t\t\tbreak;", "title": "\u6838\u5fc3\u6e90\u7801\u4e2d\u7684 EXPLAIN \u6807\u8bc6"}], "strategies": [], "description": ["\u626b\u63cf XMLTABLE \u7b49\u8868\u51fd\u6570\u4ea7\u751f\u7684\u884c\u3002"], "localization": {"status": "complete", "sources": [], "language": "zh", "original_text": {"/versions/19/description/0": "Scans the rows produced by a table function such as XMLTABLE.", "/versions/19/facts/0/label": "Core node tag", "/versions/19/facts/1/label": "Structured EXPLAIN Node Type", "/versions/19/facts/2/label": "Inputs", "/versions/19/facts/2/value": "A table-function expression", "/versions/19/facts/3/label": "Output", "/versions/19/facts/3/value": "Table-function result tuples", "/versions/19/facts/4/label": "Executor initializer", "/versions/19/facts/5/label": "Memory mechanism", "/versions/19/tables/0/title": "EXPLAIN labels in this source build", "/versions/19/related/1/label": "Using EXPLAIN", "/versions/19/related/2/label": "Parallel plans", "/versions/19/sections/0/title": "EXPLAIN names and attributes", "/versions/19/sections/1/title": "Memory and temporary storage", "/versions/19/sections/2/title": "Parallel execution and instrumentation", "/versions/19/sections/3/title": "Executor implementation notes", "/versions/19/sections/4/title": "EXPLAIN identity in core source", "/versions/19/memory/description": "This node creates a tuplestore with work_mem. The tuplestore can move stored tuples to temporary files; this does not make work_mem a cap on every allocation made by the node.", "/versions/19/sections/0/paragraphs/0": "Structured formats use the Node Type above. Text-format spellings can also include operation, strategy, join type, scan direction or aggregation-stage attributes.", "/versions/19/sections/0/paragraphs/1": "Text names recorded by this source: Table Function Scan.", "/versions/19/sections/0/paragraphs/2": "Parallel-aware and parallel-safe are different plan properties. A node running inside a parallel worker is not necessarily a parallel-aware node.", "/versions/19/sections/1/paragraphs/0": "This node creates a tuplestore with work_mem. The tuplestore can move stored tuples to temporary files; this does not make work_mem a cap on every allocation made by the node.", "/versions/19/sections/2/paragraphs/0": "The source callbacks below can coordinate execution or collect worker instrumentation. Their presence is not a blanket claim that this node supports a shared parallel scan or shared state.", "/versions/19/sections/2/paragraphs/1": "Callbacks in this build: none extracted from this node implementation.", "/versions/19/sections/3/paragraphs/0": "nodeTableFuncscan.c Support routines for scanning RangeTableFunc (XMLTABLE like functions).", "/versions/19/sections/3/paragraphs/1": "If first time through, read all tuples from function and put them in a tuplestore. Subsequent calls just fetch tuples from tuplestore.", "/versions/19/sections/3/paragraphs/2": "TableFuncRecheck -- access method routine to recheck a tuple in EvalPlanQual", "/versions/19/sections/3/paragraphs/3": "Scans the function sequentially and returns the next qualifying tuple. We call the ExecScan() routine and pass it the appropriate access method functions.", "/versions/19/sections/3/paragraphs/4": "Each call to fetch a new set of rows - of which there may be very many if XMLTABLE or JSON_TABLE is being used in a lateral join - will allocate a possibly substantial amount of memory, so we cannot use the per-query context here. perTableCxt now serves the same function as \"argcontext\" does in FunctionScan - a place to store per-one-call (i.e. one result table) lifetime data (as opposed to per-query or per-result-tuple).", "/versions/19/tables/0/columns/0/label": "Text-format label", "/versions/19/tables/0/columns/1/label": "Structured node identity"}, "fallback_fields": [], "source_language": "en", "original_snapshot_sha256": "153e7f4af3b80b8c66bd6b47432a0dbed76f2e8b5f652d4af47fbb13138cc76f"}, "evidence_kind": "source and documentation", "explain_names": ["Table Function Scan"], "partial_modes": [], "comparison_data": {"node_tag": "T_TableFuncScan", 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The tuplestore can move stored tuples to temporary files; this does not make work_mem a cap on every allocation made by the node.", "/versions/20/sections/0/paragraphs/0": "Structured formats use the Node Type above. Text-format spellings can also include operation, strategy, join type, scan direction or aggregation-stage attributes.", "/versions/20/sections/0/paragraphs/1": "Text names recorded by this source: Table Function Scan.", "/versions/20/sections/0/paragraphs/2": "Parallel-aware and parallel-safe are different plan properties. A node running inside a parallel worker is not necessarily a parallel-aware node.", "/versions/20/sections/1/paragraphs/0": "This node creates a tuplestore with work_mem. The tuplestore can move stored tuples to temporary files; this does not make work_mem a cap on every allocation made by the node.", "/versions/20/sections/2/paragraphs/0": "The source callbacks below can coordinate execution or collect worker instrumentation. Their presence is not a blanket claim that this node supports a shared parallel scan or shared state.", "/versions/20/sections/2/paragraphs/1": "Callbacks in this build: none extracted from this node implementation.", "/versions/20/sections/3/paragraphs/0": "nodeTableFuncscan.c Support routines for scanning RangeTableFunc (XMLTABLE like functions).", "/versions/20/sections/3/paragraphs/1": "If first time through, read all tuples from function and put them in a tuplestore. Subsequent calls just fetch tuples from tuplestore.", "/versions/20/sections/3/paragraphs/2": "TableFuncRecheck -- access method routine to recheck a tuple in EvalPlanQual", "/versions/20/sections/3/paragraphs/3": "Scans the function sequentially and returns the next qualifying tuple. 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\u540d\u79f0\u4e0e\u5c5e\u6027", "paragraphs": ["\u7ed3\u6784\u5316\u683c\u5f0f\u4f7f\u7528\u4e0a\u8ff0 Node Type\u3002\u6587\u672c\u683c\u5f0f\u540d\u79f0\u8fd8\u53ef\u80fd\u5305\u542b\u64cd\u4f5c\u3001\u7b56\u7565\u3001\u8fde\u63a5\u7c7b\u578b\u3001\u626b\u63cf\u65b9\u5411\u6216\u805a\u5408\u9636\u6bb5\u5c5e\u6027\u3002", "\u6b64\u6e90\u7801\u8bb0\u5f55\u7684\u6587\u672c\u540d\u79f0\uff1aTable Function Scan.", "\u5e76\u884c\u611f\u77e5\u4e0e\u5e76\u884c\u5b89\u5168\u662f\u4e0d\u540c\u7684\u8ba1\u5212\u5c5e\u6027\u3002\u5728\u5e76\u884c\u5de5\u4f5c\u8fdb\u7a0b\u5185\u8fd0\u884c\u7684\u8282\u70b9\u4e0d\u4e00\u5b9a\u662f\u5e76\u884c\u611f\u77e5\u8282\u70b9\u3002"]}, {"title": "\u5185\u5b58\u4e0e\u4e34\u65f6\u5b58\u50a8", "paragraphs": ["\u6b64\u8282\u70b9\u4f7f\u7528 work_mem \u521b\u5efa tuplestore\u3002tuplestore \u53ef\u4ee5\u5c06\u5b58\u50a8\u7684\u5143\u7ec4\u79fb\u5230\u4e34\u65f6\u6587\u4ef6\uff0c\u4f46\u8fd9\u4e0d\u610f\u5473\u7740 work_mem \u9650\u5236\u4e86\u8282\u70b9\u7684\u5168\u90e8\u5185\u5b58\u5206\u914d\u3002"]}, {"title": "\u5e76\u884c\u6267\u884c\u4e0e\u8fd0\u884c\u4fe1\u606f\u91c7\u96c6", "paragraphs": ["\u4ee5\u4e0b\u6e90\u7801\u56de\u8c03\u53ef\u4ee5\u534f\u8c03\u6267\u884c\u6216\u6536\u96c6\u5de5\u4f5c\u8fdb\u7a0b\u7684\u6d4b\u91cf\u6570\u636e\u3002\u56de\u8c03\u5b58\u5728\u4e0d\u4ee3\u8868\u8be5\u8282\u70b9\u666e\u904d\u652f\u6301\u5171\u4eab\u5e76\u884c\u626b\u63cf\u6216\u5171\u4eab\u72b6\u6001\u3002", "\u6b64\u6784\u5efa\u7684\u56de\u8c03\uff1anone extracted from this node implementation."]}, {"title": "\u6267\u884c\u5668\u5b9e\u73b0\u8bf4\u660e", "paragraphs": ["nodeTableFuncscan.c\uff1a\u652f\u6301\u626b\u63cf RangeTableFunc\uff08\u7c7b\u4f3c XMLTABLE \u7684\u51fd\u6570\uff09\u7684\u4f8b\u7a0b\u3002", "\u9996\u6b21\u6267\u884c\u65f6\uff0c\u4ece\u51fd\u6570\u8bfb\u53d6\u5168\u90e8\u5143\u7ec4\u5e76\u5b58\u5165 tuplestore\uff1b\u540e\u7eed\u8c03\u7528\u53ea\u9700\u4ece tuplestore \u83b7\u53d6\u5143\u7ec4\u3002", "TableFuncRecheck\uff1a\u5728 EvalPlanQual \u4e2d\u91cd\u65b0\u68c0\u67e5\u5143\u7ec4\u7684\u8bbf\u95ee\u65b9\u6cd5\u4f8b\u7a0b\u3002", "\u987a\u5e8f\u626b\u63cf\u51fd\u6570\u5e76\u8fd4\u56de\u4e0b\u4e00\u4e2a\u6ee1\u8db3\u6761\u4ef6\u7684\u5143\u7ec4\u3002\u8c03\u7528 ExecScan() \u5e76\u4f20\u5165\u76f8\u5e94\u7684\u8bbf\u95ee\u65b9\u6cd5\u51fd\u6570\u3002", "\u6bcf\u6b21\u8c03\u7528\u83b7\u53d6\u4e00\u7ec4\u65b0\u884c\u90fd\u53ef\u80fd\u5206\u914d\u5927\u91cf\u5185\u5b58\uff1b\u5f53 XMLTABLE \u6216 JSON_TABLE \u7528\u4e8e\u6a2a\u5411\u8fde\u63a5\u65f6\uff0c\u6b64\u7c7b\u8c03\u7528\u53ef\u80fd\u5f88\u591a\uff0c\u56e0\u6b64\u8fd9\u91cc\u4e0d\u80fd\u4f7f\u7528\u67e5\u8be2\u7ea7\u5185\u5b58\u4e0a\u4e0b\u6587\u3002perTableCxt \u73b0\u5728\u627f\u62c5\u4e0e FunctionScan \u4e2d\u201cargcontext\u201d\u76f8\u540c\u7684\u4f5c\u7528\uff0c\u7528\u4e8e\u5b58\u50a8\u751f\u547d\u5468\u671f\u9650\u5b9a\u4e3a\u4e00\u6b21\u8c03\u7528\uff08\u5373\u4e00\u4e2a\u7ed3\u679c\u8868\uff09\u7684\u6570\u636e\uff0c\u800c\u975e\u6574\u4e2a\u67e5\u8be2\u6216\u5355\u4e2a\u7ed3\u679c\u5143\u7ec4\u7684\u6570\u636e\u3002"]}, {"code": "case T_TableFuncScan:\n\t\t\tpname = sname = \"Table Function Scan\";\n\t\t\tbreak;", "title": "\u6838\u5fc3\u6e90\u7801\u4e2d\u7684 EXPLAIN \u6807\u8bc6"}], "strategies": [], "description": ["\u626b\u63cf XMLTABLE \u7b49\u8868\u51fd\u6570\u4ea7\u751f\u7684\u884c\u3002"], "localization": {"status": "complete", "sources": [], "language": "zh", "original_text": {"/versions/18/description/0": "Scans the rows produced by a table function such as XMLTABLE.", "/versions/18/facts/0/label": "Core node tag", "/versions/18/facts/1/label": "Structured EXPLAIN Node Type", "/versions/18/facts/2/label": "Inputs", "/versions/18/facts/2/value": "A table-function expression", "/versions/18/facts/3/label": "Output", "/versions/18/facts/3/value": "Table-function result tuples", "/versions/18/facts/4/label": "Executor initializer", "/versions/18/facts/5/label": "Memory mechanism", "/versions/18/tables/0/title": "EXPLAIN labels in this source build", "/versions/18/related/1/label": "Using EXPLAIN", "/versions/18/related/2/label": "Parallel plans", "/versions/18/sections/0/title": "EXPLAIN names and attributes", "/versions/18/sections/1/title": "Memory and temporary storage", "/versions/18/sections/2/title": "Parallel execution and instrumentation", "/versions/18/sections/3/title": "Executor implementation notes", "/versions/18/sections/4/title": "EXPLAIN identity in core source", "/versions/18/memory/description": "This node creates a tuplestore with work_mem. The tuplestore can move stored tuples to temporary files; this does not make work_mem a cap on every allocation made by the node.", "/versions/18/sections/0/paragraphs/0": "Structured formats use the Node Type above. Text-format spellings can also include operation, strategy, join type, scan direction or aggregation-stage attributes.", "/versions/18/sections/0/paragraphs/1": "Text names recorded by this source: Table Function Scan.", "/versions/18/sections/0/paragraphs/2": "Parallel-aware and parallel-safe are different plan properties. A node running inside a parallel worker is not necessarily a parallel-aware node.", "/versions/18/sections/1/paragraphs/0": "This node creates a tuplestore with work_mem. The tuplestore can move stored tuples to temporary files; this does not make work_mem a cap on every allocation made by the node.", "/versions/18/sections/2/paragraphs/0": "The source callbacks below can coordinate execution or collect worker instrumentation. Their presence is not a blanket claim that this node supports a shared parallel scan or shared state.", "/versions/18/sections/2/paragraphs/1": "Callbacks in this build: none extracted from this node implementation.", "/versions/18/sections/3/paragraphs/0": "nodeTableFuncscan.c Support routines for scanning RangeTableFunc (XMLTABLE like functions).", "/versions/18/sections/3/paragraphs/1": "If first time through, read all tuples from function and put them in a tuplestore. Subsequent calls just fetch tuples from tuplestore.", "/versions/18/sections/3/paragraphs/2": "TableFuncRecheck -- access method routine to recheck a tuple in EvalPlanQual", "/versions/18/sections/3/paragraphs/3": "Scans the function sequentially and returns the next qualifying tuple. We call the ExecScan() routine and pass it the appropriate access method functions.", "/versions/18/sections/3/paragraphs/4": "Each call to fetch a new set of rows - of which there may be very many if XMLTABLE or JSON_TABLE is being used in a lateral join - will allocate a possibly substantial amount of memory, so we cannot use the per-query context here. perTableCxt now serves the same function as \"argcontext\" does in FunctionScan - a place to store per-one-call (i.e. one result table) lifetime data (as opposed to per-query or per-result-tuple).", "/versions/18/tables/0/columns/0/label": "Text-format label", "/versions/18/tables/0/columns/1/label": "Structured node identity"}, "fallback_fields": [], "source_language": "en", "original_snapshot_sha256": "1674845b281805f73bce62eea7e503b81192495879b3ad27b672da42323a2566"}, "evidence_kind": "source and documentation", "explain_names": ["Table Function Scan"], "partial_modes": [], "comparison_data": {"node_tag": "T_TableFuncScan", "strategies": [], "text_names": ["Table Function Scan"], "initializer": "ExecInitTableFuncScan", "partial_modes": [], "memory_mechanism": "tuplestore", "parallel_callbacks": []}, "comparison_hash": "3af859883351e2772215a6137da127cf425f1c99d9906aeea3a3761c8d60b4c5", "explain_prefixes": ["Parallel", "Async"], "runtime_verified": false, "source_inventory": {"explain": "src/backend/commands/explain.c", "executor": "src/backend/executor/execProcnode.c", "implementation": "src/backend/executor/nodeTableFuncscan.c"}, "parallel_callbacks": []}, "comparison": {"left": "17", "right": "18", "status": "unchanged", "diff": ""}}