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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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19
contrib/hstore_plpython/hstore_plpythonu--1.0.sql Normal file
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-- make sure the prerequisite libraries are loaded
DO '1' LANGUAGE plpythonu;
SELECT NULL::hstore;
CREATE FUNCTION hstore_to_plpython(val internal) RETURNS internal
LANGUAGE C STRICT IMMUTABLE
AS 'MODULE_PATHNAME';
CREATE FUNCTION plpython_to_hstore(val internal) RETURNS hstore
LANGUAGE C STRICT IMMUTABLE
AS 'MODULE_PATHNAME';
CREATE TRANSFORM FOR hstore LANGUAGE plpythonu (
FROM SQL WITH FUNCTION hstore_to_plpython(internal),
TO SQL WITH FUNCTION plpython_to_hstore(internal)
);
COMMENT ON TRANSFORM FOR hstore LANGUAGE plpythonu IS 'transform between hstore and Python dict';