49.48. 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 49.48. pg_transform Columns

NameTypeReferencesDescription
trftypeoidpg_type.oidOID of the data type this transform is for
trflangoidpg_language.oidOID of the language this transform is for
trffromsqlregprocpg_proc.oid 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.
trftosqlregprocpg_proc.oid 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.