System Catalogs Definitions - pg_proc - 《Greenplum Database v6.23 Documentation》

The pg_proc system catalog table stores information about functions (or procedures), both built-in functions and those defined by CREATE FUNCTION. The table contains data for aggregate and window functions as well as plain functions. If proisagg is true, there should be a matching row in pg_aggregate.

For compiled functions, both built-in and dynamically loaded, prosrc contains the function’s C-language name (link symbol). For all other currently-known language types, prosrc contains the function’s source text. probin is unused except for dynamically-loaded C functions, for which it gives the name of the shared library file containing the function.

column	type	references	description
`oid`	oid		Row identifier (hidden attribute; must be explicitly selected)
`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 cpu_operator_cost units); if `proretset` is `true`, identifies the 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
`protransform`	regproc	pg_proc.oid	Calls to this function can be simplified by this other function
`proisagg`	boolean		Function is an aggregate function
`proiswindow`	boolean		Function is a window function
`prosecdef`	boolean		Function is a security definer (for example, a ‘setuid’ function)
`proleakproof`	boolean		The function has no side effects. No information about the arguments is conveyed except via the return value. Any function that might throw an error depending on the values of its arguments is not leak-proof.
`proisstrict`	boolean		Function returns NULL if any call argument is NULL. In that case the function will not actually be called at all. Functions that are not strict must be prepared to handle NULL inputs.
`proretset`	boolean		Function returns a set (multiple values of the specified data type)
`provolatile`	char		Tells whether the function’s result depends only on its input arguments, or is affected by outside factors. `i` = immutable (always delivers the same result for the same inputs), `s` = stable (results (for fixed inputs) do not change within a scan), or `v` = volatile (results may change at any time or functions with side-effects).
`pronargs`	int2		Number of arguments
`pronargdefaults`	int2		Number of arguments that have default values
`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 of 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: `i` = `IN`, `o` = `OUT` , `b` = `INOUT`, `v` = `VARIADIC`. 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 argument 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 for the function as given by `GRANT`/`REVOKE`
`prodataaccess`	char		Provides a hint regarding the type SQL statements that are included in the function: `n` - does not contain SQL, `c` - contains SQL, `r` - contains SQL that reads data, `m` - contains SQL that modifies data
`proexeclocation`	char		Where the function runs when it is invoked: `m` - master only, `a` - any segment instance, `s` - all segment instances, `i` - initplan.

Parent topic: System Catalogs Definitions