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Allow referring to functions without arguments when unique

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In DDL commands referring to an existing function, allow omitting the
argument list if the function name is unique in its schema, per SQL
standard.

This uses the same logic that the regproc type uses for finding
functions by name only.

Reviewed-by: Michael Paquier <michael.paquier@gmail.com>
This commit is contained in:
Peter Eisentraut
2017-03-09 23:58:48 -05:00
parent 3f6ea5fc8d
commit aefeb68741
17 changed files with 143 additions and 28 deletions
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6
doc/src/sgml/ref/create_cast.sgml
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@@ -19,7 +19,7 @@
<refsynopsisdiv>
<synopsis>
CREATE CAST (<replaceable>source_type</replaceable> AS <replaceable>target_type</replaceable>)
WITH FUNCTION <replaceable>function_name</replaceable> (<replaceable>argument_type</replaceable> [, ...])
WITH FUNCTION <replaceable>function_name</replaceable> [ (<replaceable>argument_type</replaceable> [, ...]) ]
[ AS ASSIGNMENT | AS IMPLICIT ]
CREATE CAST (<replaceable>source_type</replaceable> AS <replaceable>target_type</replaceable>)
@@ -192,7 +192,7 @@ SELECT CAST ( 2 AS numeric ) + 4.0;
</varlistentry>
<varlistentry>
<term><replaceable>function_name</replaceable>(<replaceable>argument_type</replaceable> [, ...])</term>
<term><literal><replaceable>function_name</replaceable>[(<replaceable>argument_type</replaceable> [, ...])]</literal></term>
<listitem>
<para>
@@ -200,6 +200,8 @@ SELECT CAST ( 2 AS numeric ) + 4.0;
be schema-qualified. If it is not, the function will be looked
up in the schema search path. The function's result data type must
match the target type of the cast. Its arguments are discussed below.
If no argument list is specified, the function name must be unique in
its schema.
</para>
</listitem>
</varlistentry>