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Add transforms feature

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This provides a mechanism for specifying conversions between SQL data
types and procedural languages.  As examples, there are transforms
for hstore and ltree for PL/Perl and PL/Python.

reviews by Pavel Stěhule and Andres Freund
This commit is contained in:
Peter Eisentraut
2015-04-26 10:33:14 -04:00
parent f320cbb615
commit cac7658205
101 changed files with 6034 additions and 2811 deletions
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47
contrib/hstore_plperl/sql/create_transform.sql Normal file
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-- general regression test for transforms
DROP EXTENSION IF EXISTS hstore CASCADE;
DROP EXTENSION IF EXISTS plperl CASCADE;
DROP EXTENSION IF EXISTS hstore_plperl CASCADE;
CREATE EXTENSION hstore;
CREATE EXTENSION plperl;
CREATE FUNCTION hstore_to_plperl(val internal) RETURNS internal
LANGUAGE C STRICT IMMUTABLE
AS '$libdir/hstore_plperl';
CREATE FUNCTION plperl_to_hstore(val internal) RETURNS hstore
LANGUAGE C STRICT IMMUTABLE
AS '$libdir/hstore_plperl';
CREATE TRANSFORM FOR foo LANGUAGE plperl (FROM SQL WITH FUNCTION hstore_to_plperl(internal), TO SQL WITH FUNCTION plperl_to_hstore(internal)); -- fail
CREATE TRANSFORM FOR hstore LANGUAGE foo (FROM SQL WITH FUNCTION hstore_to_plperl(internal), TO SQL WITH FUNCTION plperl_to_hstore(internal)); -- fail
CREATE TRANSFORM FOR hstore LANGUAGE plperl (FROM SQL WITH FUNCTION hstore_out(hstore), TO SQL WITH FUNCTION plperl_to_hstore(internal)); -- fail
CREATE TRANSFORM FOR hstore LANGUAGE plperl (FROM SQL WITH FUNCTION internal_in(cstring), TO SQL WITH FUNCTION plperl_to_hstore(internal)); -- fail
CREATE TRANSFORM FOR hstore LANGUAGE plperl (FROM SQL WITH FUNCTION hstore_to_plperl(internal), TO SQL WITH FUNCTION plperl_to_hstore(internal)); -- ok
CREATE TRANSFORM FOR hstore LANGUAGE plperl (FROM SQL WITH FUNCTION hstore_to_plperl(internal), TO SQL WITH FUNCTION plperl_to_hstore(internal)); -- fail
CREATE OR REPLACE TRANSFORM FOR hstore LANGUAGE plperl (FROM SQL WITH FUNCTION hstore_to_plperl(internal), TO SQL WITH FUNCTION plperl_to_hstore(internal)); -- ok
CREATE OR REPLACE TRANSFORM FOR hstore LANGUAGE plperl (FROM SQL WITH FUNCTION hstore_to_plperl(internal)); -- ok
CREATE OR REPLACE TRANSFORM FOR hstore LANGUAGE plperl (TO SQL WITH FUNCTION plperl_to_hstore(internal)); -- ok
DROP TRANSFORM IF EXISTS FOR fake_type LANGUAGE plperl;
DROP TRANSFORM IF EXISTS FOR hstore LANGUAGE fake_lang;
DROP TRANSFORM FOR foo LANGUAGE plperl;
DROP TRANSFORM FOR hstore LANGUAGE foo;
DROP TRANSFORM FOR hstore LANGUAGE plperl;
DROP TRANSFORM IF EXISTS FOR hstore LANGUAGE plperl;
DROP FUNCTION hstore_to_plperl(val internal);
DROP FUNCTION plperl_to_hstore(val internal);
CREATE EXTENSION hstore_plperl;
\dx+ hstore_plperl
ALTER EXTENSION hstore_plperl DROP TRANSFORM FOR hstore LANGUAGE plperl;
\dx+ hstore_plperl
ALTER EXTENSION hstore_plperl ADD TRANSFORM FOR hstore LANGUAGE plperl;
\dx+ hstore_plperl
DROP EXTENSION hstore CASCADE;
DROP EXTENSION plperl CASCADE;