PG_PROC

PG_PROC records information about functions or procedures.

Table 1 PG_PROC columns

Name	Type	Description
oid	oid	Row identifier (hidden attribute, which must be specified)
proname	name	Function name
pronamespace	oid	OID of the namespace that contains the function
proowner	oid	Owner of the function
prolang	oid	Implementation language or call interface of the 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 the function
prokind	"char"	Function kind, 'f' for a normal function, 'p' for a procedure, 'a' for an aggregate function, or 'w' for a window function
prosecdef	Boolean	Whether the 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 is actually not called at all. Functions that are not "strict" must be prepared to process null inputs.
proretset	Boolean	The function returns a set (multiple values of a specified data type).
provolatile	"char"	Whether the function's result depends only on its input parameters, or is affected by outside factors. - i: for "immutable" functions, which always deliver the same result for the same inputs. - s: for "stable" functions, whose results (for fixed inputs) do not change within a scan. - 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 have default values
prorettype	oid	Data type of return values
proargtypes	oidvector	Array that stores the data types of function parameters. This array includes only input parameters (including INOUT parameters), and represents the call signature (interface) of the function.
proallargtypes	oid[]	Array that contains the data types of function parameters. 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, proargtypes is subscripted from 0.
proargmodes	"char"[]	Array that stores the modes of function parameters, encoded as i for IN parameters, o for OUT parameters, and b for INOUT parameters, v for VARIADIC 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	A definition that describes a function or stored procedure. In an interpreting language, it is the function source code, a link symbol, a file name, or any body content specified when a function or stored procedure is created, depending on how a language or call is used.
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.
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 the 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. For the C function created by the user, the default value of the fencedmode field is true, that is, fence mode; the system built-in function, the fencedmode field is all false, that is, not fence mode.
proshippable	Boolean	Whether the function can be pushed down to database nodes. The default value is false. - Functions of the IMMUTABLE type can always be pushed down to the database nodes. - A STABLE or VOLATILE function can be pushed down to the database nodes only if SHIPPABLE is specified for it.
propackage	Boolean	Whether the function supports overloading. The default value is false.