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 49-47. pg_transform Columns
|trftype||oid||pg_type.oid||OID of the data type this transform is for|
|trflang||oid||pg_language.oid||OID of the language this transform is for|
|trffromsql||regproc||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||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.|
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