Catalogs: 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 50-48. pg_transform Columns

Name	Type	References	Description
`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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Links:

https://www.postgresql.org/docs/9.6/static/catalog-pg-transform.html

doc_PostgreSQL

2016-10-12 11:32:40

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