52.57. pg_transform
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## 52.57. 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 52.57. 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.

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