对于运行 9.4.X 的用户，不需要转储/恢复。
\n但是，如果你是从早于 9.4.18 的版本升级，请参见第 E.9 节。
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\n但是，如果你是从早于 9.4.18 的版本升级，请参见第 E.9 节。
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修复带重复连接名的查询的错误打印（Philip Dubé）
\n这一疏漏导致包含此类查询的视图在转储/恢复时失败。
", "text": "修复带重复连接名的查询的错误打印（Philip Dubé） 这一疏漏导致包含此类查询的视图在转储/恢复时失败。", "title": "修复带重复连接名的查询的错误打印", "commits": [], "section": "变更", "category": "bugfix", "source_url": "/docs/release/9.4.23/#id-1.11.6.8.6", "source_hash": "9ee159ed3109c4b0f0bf1c1ffffedca601b89fb052b78ff94e7c67f0079c35ab", "section_path": ["变更"], "commit_groups": [["30d3df0a7", "3d99a8139", "8ace51a6b", "ad3e61b28", "bf612fd3a", "f95d8f810"]], "identity_text": "Fix incorrect printing of queries with duplicate join names (Philip Dubé) This oversight caused a dump/restore failure for views containing such queries.", "commit_aliases": ["30d3df0a7", "3d99a8139", "8ace51a6b", "ad3e61b28", "bf612fd3a", "f95d8f810"], "source_commits": ["8ace51a6b"], "source_entry_id": "9.4.23/changes/002", "db_id": "b99a1ae1d7541f85fbc0194f8c662e0d", "patch_ids": ["58dc2880d650759c2ee405bf3a9b2fdd"], "statement_hash": "9330ff3ed22edad6c481ad437d7f285101418275e0baf7a9dd075e2620dca9a1", "relations": [{"rule": 2, "type": "equivalent", "target": "2656cbfb941f38df372fc01f0006353b", "evidence": {"same_day": true, "patch_ids": ["58dc2880d650759c2ee405bf3a9b2fdd"], "statement_hash": "9330ff3ed22edad6c481ad437d7f285101418275e0baf7a9dd075e2620dca9a1"}}, {"rule": 2, "type": "equivalent", "target": "7a23f8ee65e5b7bcee65cd28cfc4b10c", "evidence": {"same_day": true, "patch_ids": ["58dc2880d650759c2ee405bf3a9b2fdd"], "statement_hash": "9330ff3ed22edad6c481ad437d7f285101418275e0baf7a9dd075e2620dca9a1"}}, {"rule": 2, "type": "equivalent", "target": "ce621bfa11fdf4057e33a07171485043", "evidence": {"same_day": true, "patch_ids": ["58dc2880d650759c2ee405bf3a9b2fdd"], "statement_hash": "9330ff3ed22edad6c481ad437d7f285101418275e0baf7a9dd075e2620dca9a1"}}, {"rule": 2, "type": "equivalent", "target": "da9f7a3369239a5bbd2afff9bc43dcf1", "evidence": {"same_day": true, "patch_ids": ["58dc2880d650759c2ee405bf3a9b2fdd"], "statement_hash": "9330ff3ed22edad6c481ad437d7f285101418275e0baf7a9dd075e2620dca9a1"}}], "version": "9.4.23", "category_label": "BUG 修复", "also_in": [], "variants": [], "related_changes": [{"db_id": "2656cbfb941f38df372fc01f0006353b", "kind": "equivalent", "version": "11.4", "label": "11.4", "title": "修复带有重复连接名称的查询的不正确输出", "evidence": {"same_day": true, "patch_ids": ["58dc2880d650759c2ee405bf3a9b2fdd"], "statement_hash": "9330ff3ed22edad6c481ad437d7f285101418275e0baf7a9dd075e2620dca9a1"}, "url": "/docs/compare/?release=11.4#11.4-67f47b7727df0059", "source_url": "/docs/release/11.4/#id-1.11.6.23.5"}, {"db_id": "ce621bfa11fdf4057e33a07171485043", "kind": "equivalent", "version": "10.9", "label": "10.9", "title": "修复带有重复连接名称的查询的不正确输出", "evidence": {"same_day": true, "patch_ids": ["58dc2880d650759c2ee405bf3a9b2fdd"], "statement_hash": "9330ff3ed22edad6c481ad437d7f285101418275e0baf7a9dd075e2620dca9a1"}, "url": "/docs/compare/?release=10.9#10.9-67f47b7727df0059", "source_url": "/docs/release/10.9/#id-1.11.6.19.5"}, {"db_id": "da9f7a3369239a5bbd2afff9bc43dcf1", "kind": "equivalent", "version": "9.6.14", "label": "9.6.14", "title": "修复带重复连接名的查询的错误打印", "evidence": {"same_day": true, "patch_ids": ["58dc2880d650759c2ee405bf3a9b2fdd"], "statement_hash": "9330ff3ed22edad6c481ad437d7f285101418275e0baf7a9dd075e2620dca9a1"}, "url": "/docs/compare/?release=9.6.14#9.6.14-7b4f811fceeb4bff", "source_url": "/docs/release/9.6.14/#id-1.11.6.15.5"}, {"db_id": "7a23f8ee65e5b7bcee65cd28cfc4b10c", "kind": "equivalent", "version": "9.5.18", "label": "9.5.18", "title": "修复带重复连接名的查询的错误打印", "evidence": {"same_day": true, "patch_ids": ["58dc2880d650759c2ee405bf3a9b2fdd"], "statement_hash": "9330ff3ed22edad6c481ad437d7f285101418275e0baf7a9dd075e2620dca9a1"}, "url": "/docs/compare/?release=9.5.18#9.5.18-7b4f811fceeb4bff", "source_url": "/docs/release/9.5.18/#id-1.11.6.12.5"}]}, {"id": "9.4.23-bbac378f1b5576b4", "cves": [], "html": "修复正则表达式中 {1,1} 量词的错误优化（Tom Lane）
此类量词被当作无操作而被优化掉；但文档规定它们会给所附加的子表达式施加贪婪性，或者对于非贪婪变体 {1,1}? 施加非贪婪性，而这没有发生。只有当子表达式包含捕获圆括号或反向引用时才会出现错误行为。
修复检查冲突 postmaster 是否仍在使用既有共享内存段的竞态条件（Tom Lane）
", "text": "修复检查冲突 postmaster 是否仍在使用既有共享内存段的竞态条件（Tom Lane）", "title": "修复检查冲突 postmaster 是否仍在使用既有共享内存段的竞态条件", "commits": [], "section": "变更", "category": "bugfix", "source_url": "/docs/release/9.4.23/#id-1.11.6.8.6", "source_hash": "6b410dc547bb255e33e18eaf615e83fe2390eb910f81b8796832a72dcf253fb8", "section_path": ["变更"], "commit_groups": [["3dcf45af5", "610747d86", "803f90ab7", "91a05390c", "a73c8caea", "b1cde67a4"]], "identity_text": "Fix race condition in check to see whether a pre-existing shared memory segment is still in use by a conflicting postmaster (Tom Lane)", "commit_aliases": ["3dcf45af5", "610747d86", "803f90ab7", "91a05390c", "a73c8caea", "b1cde67a4"], "source_commits": ["b1cde67a4"], "source_entry_id": "9.4.23/changes/004", "db_id": "d7fe2a0ebf38ee8098fe1d6d28299d08", "patch_ids": ["7bd7781fee3550eb7607c07befef081a"], "statement_hash": "dd879be66b00ecee021da17e7068e63e61bdac9b9606c0740bb936aaf5bd26da", "relations": [{"rule": 2, "type": "equivalent", "target": "2b65208026195e9279c5a53ceba66228", "evidence": {"same_day": true, "patch_ids": ["7bd7781fee3550eb7607c07befef081a"], "statement_hash": "dd879be66b00ecee021da17e7068e63e61bdac9b9606c0740bb936aaf5bd26da"}}, {"rule": 2, "type": "equivalent", "target": "78c86fc36a8a5f6abd288250eaf289f1", "evidence": {"same_day": true, "patch_ids": ["7bd7781fee3550eb7607c07befef081a"], "statement_hash": "dd879be66b00ecee021da17e7068e63e61bdac9b9606c0740bb936aaf5bd26da"}}, {"rule": 2, "type": "equivalent", "target": "9fdc1030c6b13b64ab065e3b76c5248f", "evidence": {"same_day": true, "patch_ids": ["7bd7781fee3550eb7607c07befef081a"], "statement_hash": "dd879be66b00ecee021da17e7068e63e61bdac9b9606c0740bb936aaf5bd26da"}}, {"rule": 2, "type": "equivalent", "target": "ebcf9d6b59071557e6ee1fbdc63e94b6", "evidence": {"same_day": true, "patch_ids": ["7bd7781fee3550eb7607c07befef081a"], "statement_hash": "dd879be66b00ecee021da17e7068e63e61bdac9b9606c0740bb936aaf5bd26da"}}], "version": "9.4.23", "category_label": "BUG 修复", "also_in": [], "variants": [], "related_changes": [{"db_id": "9fdc1030c6b13b64ab065e3b76c5248f", "kind": "equivalent", "version": "11.4", "label": "11.4", "title": "修复检查预先存在的共享内存段是否仍被冲突的 postmaster 使用时的竞争条件", "evidence": {"same_day": true, "patch_ids": ["7bd7781fee3550eb7607c07befef081a"], "statement_hash": "dd879be66b00ecee021da17e7068e63e61bdac9b9606c0740bb936aaf5bd26da"}, "url": "/docs/compare/?release=11.4#11.4-145ae36803661d4b", "source_url": "/docs/release/11.4/#id-1.11.6.23.5"}, {"db_id": "2b65208026195e9279c5a53ceba66228", "kind": "equivalent", "version": "10.9", "label": "10.9", "title": "修复检查预先存在的共享内存段是否仍被冲突的 postmaster 使用时的竞争条件", "evidence": {"same_day": true, "patch_ids": ["7bd7781fee3550eb7607c07befef081a"], "statement_hash": "dd879be66b00ecee021da17e7068e63e61bdac9b9606c0740bb936aaf5bd26da"}, "url": "/docs/compare/?release=10.9#10.9-145ae36803661d4b", "source_url": "/docs/release/10.9/#id-1.11.6.19.5"}, {"db_id": "78c86fc36a8a5f6abd288250eaf289f1", "kind": "equivalent", "version": "9.6.14", "label": "9.6.14", "title": "修复检查冲突 postmaster 是否仍在使用既有共享内存段的竞态条件", "evidence": {"same_day": true, "patch_ids": ["7bd7781fee3550eb7607c07befef081a"], "statement_hash": "dd879be66b00ecee021da17e7068e63e61bdac9b9606c0740bb936aaf5bd26da"}, "url": "/docs/compare/?release=9.6.14#9.6.14-bf0209ff63e0472d", "source_url": "/docs/release/9.6.14/#id-1.11.6.15.5"}, {"db_id": "ebcf9d6b59071557e6ee1fbdc63e94b6", "kind": "equivalent", "version": "9.5.18", "label": "9.5.18", "title": "修复检查冲突 postmaster 是否仍在使用既有共享内存段的竞态条件", "evidence": {"same_day": true, "patch_ids": ["7bd7781fee3550eb7607c07befef081a"], "statement_hash": "dd879be66b00ecee021da17e7068e63e61bdac9b9606c0740bb936aaf5bd26da"}, "url": "/docs/compare/?release=9.5.18#9.5.18-bf0209ff63e0472d", "source_url": "/docs/release/9.5.18/#id-1.11.6.12.5"}]}, {"id": "9.4.23-6d1c297754a0d746", "cves": [], "html": "避免在未连接到特定数据库的进程中尝试为参数检查做数据库访问（Vignesh C、Andres Freund）
\n这个错误可能导致诸如 “cannot read pg_class without having selected a database” 之类的失败。
", "text": "避免在未连接到特定数据库的进程中尝试为参数检查做数据库访问（Vignesh C、Andres Freund） 这个错误可能导致诸如 “cannot read pg_class without having selected a database” 之类的失败。", "title": "避免在未连接到特定数据库的进程中尝试为参数检查做数据库访问", "commits": [], "section": "变更", "category": "improvement", "source_url": "/docs/release/9.4.23/#id-1.11.6.8.6", "source_hash": "cc03b84e150e13131d76dd41ba5f9cffacd7c6a63ab680f2e8b0b2d2bc3bcb77", "section_path": ["变更"], "commit_groups": [["483b2d7ae", "52ad5fc0a", "69f32206d", "b8607e15e", "c01556017", "fff2a7d7b"]], "identity_text": "Avoid attempting to do database accesses for parameter checking in processes that are not connected to a specific database (Vignesh C, Andres Freund) This error could result in failures like cannot read pg_class without having selected a database.", "commit_aliases": ["483b2d7ae", "52ad5fc0a", "69f32206d", "b8607e15e", "c01556017", "fff2a7d7b"], "source_commits": ["69f32206d"], "source_entry_id": "9.4.23/changes/005", "db_id": "827a6d2e0daa51d02fae5f72e9ed1c60", "patch_ids": ["eb7ca5a3deb1764915b19a4212f1d25e"], "statement_hash": "1a7670883364a8b3a9b3127f168808c3902ef044f9e9a3683497cbacab1e08c7", "relations": [{"rule": 2, "type": "equivalent", "target": "8a9e52a1d52618e73a157df3f8bb3bec", "evidence": {"same_day": true, "patch_ids": ["eb7ca5a3deb1764915b19a4212f1d25e"], "statement_hash": "1a7670883364a8b3a9b3127f168808c3902ef044f9e9a3683497cbacab1e08c7"}}, {"rule": 2, "type": "equivalent", "target": "90744f89a54c75c9d18bbda103670c0b", "evidence": {"same_day": true, "patch_ids": ["eb7ca5a3deb1764915b19a4212f1d25e"], "statement_hash": "1a7670883364a8b3a9b3127f168808c3902ef044f9e9a3683497cbacab1e08c7"}}, {"rule": 2, "type": "equivalent", "target": "93eb49d1a9fa05b38f11502f6653af76", "evidence": {"same_day": true, "patch_ids": ["eb7ca5a3deb1764915b19a4212f1d25e"], "statement_hash": "1a7670883364a8b3a9b3127f168808c3902ef044f9e9a3683497cbacab1e08c7"}}, {"rule": 2, "type": "equivalent", "target": "b0a2c3f14f56fa7697ddbdcfd9782707", "evidence": {"same_day": true, "patch_ids": ["eb7ca5a3deb1764915b19a4212f1d25e"], "statement_hash": "1a7670883364a8b3a9b3127f168808c3902ef044f9e9a3683497cbacab1e08c7"}}], "version": "9.4.23", "category_label": "其他改进", "also_in": [], "variants": [], "related_changes": [{"db_id": "b0a2c3f14f56fa7697ddbdcfd9782707", "kind": "equivalent", "version": "11.4", "label": "11.4", "title": "避免在未连接到特定数据库的进程中，为检查参数而尝试访问数据库", "evidence": {"same_day": true, "patch_ids": ["eb7ca5a3deb1764915b19a4212f1d25e"], "statement_hash": "1a7670883364a8b3a9b3127f168808c3902ef044f9e9a3683497cbacab1e08c7"}, "url": "/docs/compare/?release=11.4#11.4-4c8922c4b309d53f", "source_url": "/docs/release/11.4/#id-1.11.6.23.5"}, {"db_id": "8a9e52a1d52618e73a157df3f8bb3bec", "kind": "equivalent", "version": "10.9", "label": "10.9", "title": "避免在未连接到特定数据库的进程中，为检查参数而尝试访问数据库", "evidence": {"same_day": true, "patch_ids": ["eb7ca5a3deb1764915b19a4212f1d25e"], "statement_hash": "1a7670883364a8b3a9b3127f168808c3902ef044f9e9a3683497cbacab1e08c7"}, "url": "/docs/compare/?release=10.9#10.9-4c8922c4b309d53f", "source_url": "/docs/release/10.9/#id-1.11.6.19.5"}, {"db_id": "93eb49d1a9fa05b38f11502f6653af76", "kind": "equivalent", "version": "9.6.14", "label": "9.6.14", "title": "避免在未连接到特定数据库的进程中尝试为参数检查做数据库访问", "evidence": {"same_day": true, "patch_ids": ["eb7ca5a3deb1764915b19a4212f1d25e"], "statement_hash": "1a7670883364a8b3a9b3127f168808c3902ef044f9e9a3683497cbacab1e08c7"}, "url": "/docs/compare/?release=9.6.14#9.6.14-6d1c297754a0d746", "source_url": "/docs/release/9.6.14/#id-1.11.6.15.5"}, {"db_id": "90744f89a54c75c9d18bbda103670c0b", "kind": "equivalent", "version": "9.5.18", "label": "9.5.18", "title": "避免在未连接到特定数据库的进程中尝试为参数检查做数据库访问", "evidence": {"same_day": true, "patch_ids": ["eb7ca5a3deb1764915b19a4212f1d25e"], "statement_hash": "1a7670883364a8b3a9b3127f168808c3902ef044f9e9a3683497cbacab1e08c7"}, "url": "/docs/compare/?release=9.5.18#9.5.18-6d1c297754a0d746", "source_url": "/docs/release/9.5.18/#id-1.11.6.12.5"}]}, {"id": "9.4.23-86822b1aaeb92736", "cves": [], "html": "改进 initdb 对系统时区多个等价名称的处理（Tom Lane、Andrew Gierth）
\n让 initdb 检查 /etc/localtime 符号链接（如果存在），以在系统时区的等价名称之间打破平局。这使 initdb 在存在多个相同时区时更可能选择用户期望的时区名。如果 /etc/localtime 不是指向时区数据文件的符号链接，或者时区是由 TZ 环境变量确定的，则不会改变行为。
另外，当 TZ 和 /etc/localtime 都未提供提示时，优先选择 UTC 而不是该时区的其他拼法。这修复了 tzdata 2019a 把 UCT 和 UTC 时区名变为等价而引入的烦恼：initdb 随后偏爱 UCT，而几乎没人想要它。
修复 reindexdb 的误导性错误报告（Julien Rouhaud）
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如果触发器修改了 UPDATE 本不会更改的列，新值不会被传输到远程服务器。
在 Windows 上，避免数据库编码设为 SQL_ASCII 而我们尝试记录非 ASCII 字符串时的失败（Noah Misch）
\n代码此前假定这种字符串必须是 UTF-8，如果它们看起来不是有效编码就会抛出错误。现在，只是把未翻译的字节传给日志。
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