# 52.55. 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 52.55. pg_transform
Columns
Column Type Description |
---|
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 the default behavior should be used. |
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 the default behavior should be used. |