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.
