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PG_PROC

PG_PROC stores information about functions or procedures.

Table 1 PG_PROC columns

Name

Type

Description

proname

name

Indicates the name of the function.

pronamespace

oid

OID of the namespace that contains this function

proowner

oid

Owner of the function

prolang

oid

Implementation language or call interface of this function

procost

real

Estimated execution cost

prorows

real

Estimated number of rows that are influenced

provariadic

oid

Data type of parameter element

protransform

regproc

Simplified call method for this function

proisagg

Boolean

Indicates that this function is an aggregate function.

proiswindow

Boolean

Indicates that this function is a window function.

prosecdef

Boolean

Indicates that this function is a security definer (or a "setuid" function).

proleakproof

Boolean

This function has no side effect. If no leakproof treatment is provided for parameters, the function throws errors.

proisstrict

Boolean

The function returns null if any call parameter is null. In that case the function does not actually be called at all. Functions that are not "strict" must be prepared to process null inputs.

proretset

Boolean

The function returns a set (that is, multiple values of the specified data type).

provolatile

"char"

Whether the function's result depends only on its input parameters, 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 may change at any time. Use v also for functions with side-effects, so that the engine cannot get optimized if volatile functions are called.

pronargs

smallint

Number of parameters

pronargdefaults

smallint

Number of parameters that has default values

prorettype

oid

Data type of returned value

proargtypes

oidvector

Indicates an array with the data types that store function parameters. This includes only input parameters (including INOUT parameters), and represents the call signature (interface) of the function.

proallargtypes

oid[]

Array with the data types of the function arguments. This array includes all parameter types (including OUT and INOUT parameters); however, if all the parameters are IN parameters, this column is null. Note that array subscripting is 1-based, whereas for historical reasons, and proargtypes is subscripted from 0.

proargmodes

"char"[]

Array with the modes of the function parameters, encoded as i for IN parameters, o for OUT parameters, and b for INOUT parameters. If all the parameters are IN parameters, this column is null. Note that subscripts correspond to positions of proallargtypes not proargtypes.

proargnames

text[]

Array that stores the names of the function parameters. Parameters without a name are set to empty strings in the array. If none of the parameters have a name, this column is null. Note that subscripts correspond to positions of proallargtypes not proargtypes.

proargdefaults

pg_node_tree

Expression tree of the default value. This is the list of PRONARGDEFAULTS elements.

prosrc

text

Indicates how the function processor calls the function. It may be the actual source code of the function for interpreted languages, a link symbol, a file name, or anything else, depending on the implementation language/call convention.

probin

text

Additional information about how to call the function. Again, the interpretation is language-specific.

proconfig

text[]

Function's local settings for run-time configuration variables.

proacl

aclitem[]

Access permissions For details, see GRANT and REVOKE.

prodefaultargpos

int2vector

Locations of the function default values. Not only the last few parameters have default values.

fencedmode

Boolean

Execution mode of a function, indicating whether a function is executed in fence or not fence mode. If the execution mode is fence, the function is executed in the fork process that is reworked. The default value is fence.