oid oid

Row identifier

trftype oid (references pg_type.oid)

OID of the data type this transform is for

trflang oid (references pg_language.oid)

OID of the language this transform is for

trffromsql regproc (references pg_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.

trftosql regproc (references pg_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.