Here is an updated patch for the transforms feature. The previous discussion was here: http://www.postgresql.org/message-id/1339713732.11971.79.ca...@vanquo.pezone.net
Old news: At the surface, this contains: - New catalog pg_transform - CREATE/DROP TRANSFORM As proofs of concept and useful applications, I have included transforms for - PL/Perl - hstore - PL/Python - hstore - PL/Python - ltree New news: I have tried to address all issues raised during previous reviews. The regression tests for hstore_plpython and ltree_plpython don't pass with Python 3. This needs to be fixed, obviously, but it's an issue unrelated to the core functionality. As a demo that this can be used externally as well, I have written a proof-of-concept transform between plpython and the mpz type in the pgmp extension (multi-precision arithmetic extension): https://github.com/petere/pgmp/tree/transforms/plpython Note: There was a lot of churn lately in src/backend/commands/, and I had to fix merge conflicts several times, so you need source as of about right now to apply this patch cleanly. Side issue/peculiarity: I had to change some shared library linking flags for OS X. Ordinarily, when linking a dynamically loadable module on OS X, if there are unresolved symbols, it's an error. But for example, when we link hstore_plpython, we expect some symbols to be resolved in hstore.so or plpythonu.so, so we need to ignore unresolved symbols. This change basically just makes OS X behave like other platforms in this regard. There might be other portability issues on other platforms.
pg-transforms-20130115.patch.gz
Description: GNU Zip compressed data
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