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3.24. pg_proc

This catalog stores information about functions (or procedures). The description of CREATE FUNCTION and the Programmer's Guide contain more information about the meaning of some fields.

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 3-24. 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 int4 pg_shadow.usesysid Owner (creator) 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 (ie, 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 A vector with the data types of the function arguments
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 permissions

Currently, prosrc contains the function's C-language name (link symbol) for compiled functions, both built-in and dynamically loaded. For all other language types, prosrc contains the function's source text.

Currently, 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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