pg_proc

The pg_proc system catalog table stores information about functions, both built-in functions and those defined by CREATE FUNCTION. The table contains data for aggregate and window 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

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 (`0` if not `proretset`)
provariadic	oid	pg_type.oid	Data type of the variadic array parameter’s elements, or `0` 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). `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 indexed 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 list has `pronargdefaults` elements, which match the last N input arguments — the last N positions in `proargtypes`. 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`.

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 (0 if not proretset)

provariadic

oid

pg_type.oid

Data type of the variadic array parameter’s elements, or 0 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).
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 indexed 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 list has pronargdefaults elements, which match the last N input arguments — the last N positions in proargtypes. 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.

pg_pltemplate

pg_resgroup