diff options
Diffstat (limited to 'doc/src/sgml/ref/create_function.sgml')
| -rw-r--r-- | doc/src/sgml/ref/create_function.sgml | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/doc/src/sgml/ref/create_function.sgml b/doc/src/sgml/ref/create_function.sgml index 20019215351..c5beb166cfa 100644 --- a/doc/src/sgml/ref/create_function.sgml +++ b/doc/src/sgml/ref/create_function.sgml @@ -25,6 +25,7 @@ CREATE [ OR REPLACE ] FUNCTION [ RETURNS <replaceable class="parameter">rettype</replaceable> | RETURNS TABLE ( <replaceable class="parameter">column_name</replaceable> <replaceable class="parameter">column_type</replaceable> [, ...] ) ] { LANGUAGE <replaceable class="parameter">lang_name</replaceable> + | TRANSFORM { FOR TYPE <replaceable class="parameter">type_name</replaceable> } [, ... ] | WINDOW | IMMUTABLE | STABLE | VOLATILE | [ NOT ] LEAKPROOF | CALLED ON NULL INPUT | RETURNS NULL ON NULL INPUT | STRICT @@ -261,6 +262,23 @@ CREATE [ OR REPLACE ] FUNCTION </varlistentry> <varlistentry> + <term><literal>TRANSFORM { FOR TYPE <replaceable class="parameter">type_name</replaceable> } [, ... ] }</literal></term> + + <listitem> + <para> + Lists which transforms a call to the function should apply. Transforms + convert between SQL types and language-specific data types; + see <xref linkend="sql-createtransform">. Procedural language + implementations usually have hardcoded knowledge of the built-in types, + so those don't need to be listed here. If a procedural language + implementation does not know how to handle a type and no transform is + supplied, it will fall back to a default behavior for converting data + types, but this depends on the implementation. + </para> + </listitem> + </varlistentry> + + <varlistentry> <term><literal>WINDOW</literal></term> <listitem> |