pg_proc

PostgreSQL 7.3.4 Documentation
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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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