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42.27. pg_proc

The catalog pg_proc stores information about functions (or procedures). See CREATE FUNCTION and Section 32.3 for more information.

The table contains data for aggregate functions as well as plain functions. If proisagg is true, there should be a matching row in pg_aggregate.

Table 42-27. pg_proc Columns

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
proisagg bool   Function is an aggregate 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 may 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 arguments
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 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. 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.
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 bytea   Additional information about how to invoke the function. Again, the interpretation is language-specific.
proacl aclitem[]   Access privileges; see GRANT and REVOKE for details.

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.

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