51.55. pg_transform
The catalog pg_transform stores information about transforms, which are a mechanism to adapt data types to procedural languages. See CREATE TRANSFORM for more information.
Table 51.55. pg_transform Columns
| Name | Type | References | Description |
|---|---|---|---|
trftype | oid | | OID of the data type this transform is for |
trflang | oid | | OID of the language this transform is for |
trffromsql | regproc | | The OID of the function to use when converting the data type for input to the procedural language (e.g., function parameters). Zero is stored if this operation is not supported. |
trftosql | regproc | | The OID of the function to use when converting output from the procedural language (e.g., return values) to the data type. Zero is stored if this operation is not supported. |