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.
Table 3-15. pg_proc Columns
| Name | Type | References | Description |
|---|---|---|---|
| proname | name | Name of the function | |
| proowner | int4 | pg_shadow.usesysid | Owner (creator) of the function |
| prolang | oid | pg_language.oid | Implementation language or call interface of this function |
| proisinh | bool | unused | |
| proistrusted | bool | not functional | |
| proiscachable | bool | Function returns same result for same input values | |
| 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. | |
| pronargs | int2 | Number of arguments | |
| proretset | bool | Function returns a set (ie, multiple values of the specified datatype) | |
| prorettype | oid | pg_type.oid | Data type of the return value (0 if the function does not return a value) |
| proargtypes | oidvector | pg_type.oid | A vector with the data types of the function arguments |
| probyte_pct | int4 | dead code | |
| properbyte_cpu | int4 | dead code | |
| propercall_cpu | int4 | dead code | |
| prooutin_ratio | int4 | dead code | |
| 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. |
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.