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45.35. pg_proc
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45.35. pg_proc #

目录pg_proc存放有关函数（或过程）的信息。 更多信息请参见CREATE FUNCTION和第 35.3 节。

该表同时包含聚合函数和普通函数的数据。如果proisagg为真， 在pg_aggregate中应该有一个相匹配的行。

表 45.35. pg_proc 列

Name Type References Description
proname name   Name of the function
pronamespace oid pg_namespace.oid The OID of the namespace that contains this function
proowner oid pg_authid.oid Owner of the function
prolang oid pg_language.oid Implementation language or call interface of this function
procost float4   Estimated execution cost (in units of cpu_operator_cost); if proretset, this is cost per row returned
prorows float4   Estimated number of result rows (zero if not proretset)
provariadic oid pg_type.oid Data type of the variadic array parameter's elements, or zero if the function does not have a variadic parameter
proisagg bool   Function is an aggregate function
proiswindow bool   Function is a window function
prosecdef bool   Function is a security definer (i.e., a “setuid” function)
proisstrict bool   Function returns null if any call argument is null. In that case the function won't actually be called at all. Functions that are not “strict” must be prepared to handle null inputs.
proretset bool   Function returns a set (i.e., multiple values of the specified data type)
provolatile char   provolatile tells whether the function's result depends only on its input arguments, or is affected by outside factors. It is i for “immutable” functions, which always deliver the same result for the same inputs. It is s for “stable” functions, whose results (for fixed inputs) do not change within a scan. It is v for “volatile” functions, whose results might change at any time. (Use v also for functions with side-effects, so that calls to them cannot get optimized away.)
pronargs int2   Number of input arguments
pronargdefaults int2   Number of arguments that have defaults
prorettype oid pg_type.oid Data type of the return value
proargtypes oidvector pg_type.oid An array with the data types of the function arguments. This includes only input arguments (including INOUT and VARIADIC arguments), and thus represents the call signature of the function.
proallargtypes oid[] pg_type.oid An array with the data types of the function arguments. This includes all arguments (including OUT and INOUT arguments); however, if all the arguments are IN arguments, this field will be null. Note that subscripting is 1-based, whereas for historical reasons proargtypes is subscripted from 0.
proargmodes char[]   An array with the modes of the function arguments, encoded as i for IN arguments, o for OUT arguments, b for INOUT arguments, v for VARIADIC arguments, t for TABLE arguments. If all the arguments are IN arguments, this field will be null. Note that subscripts correspond to positions of proallargtypes not proargtypes.
proargnames text[]   An array with the names of the function arguments. Arguments without a name are set to empty strings in the array. If none of the arguments have a name, this field will be null. Note that subscripts correspond to positions of proallargtypes not proargtypes.
proargdefaults pg_node_tree   Expression trees (in nodeToString() representation) for default values. This is a list with pronargdefaults elements, corresponding to the last N input arguments (i.e., the last N proargtypes positions). If none of the arguments have defaults, this field will be null.
prosrc text   This tells the function handler how to invoke the function. It might be the actual source code of the function for interpreted languages, a link symbol, a file name, or just about anything else, depending on the implementation language/call convention.
probin text   Additional information about how to invoke the function. Again, the interpretation is language-specific.
proconfig text[]   Function's local settings for run-time configuration variables
proacl aclitem[]   Access privileges; see GRANT and REVOKE for details

对于编译好的函数，包括内置函数和动态装载函数，prosrc包含函数的 C 语言名字（链接符号）。 所有其他已知的语言类型，prosrc包含函数的源码文本。 除了对于动态载入的C函数之外，probin不使用，对于动态载入的C函数，它给定了包含该函数的共享库文件的名称。

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