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-From: Massimo Dal Zotto <dz@cs.unitn.it>
-Date: Mon, 6 May 1996 01:03:37 +0200 (MET DST)
-Subject: [PG95]: new operators for arrays
-
-- -----BEGIN PGP SIGNED MESSAGE-----
-
-Hi,
-
-I have written an extension to Postgres95 which allows to use qualification
-clauses based on the values of single elements of arrays.
-For example I can now select rows having some or all element of an array
-attribute equal to a given value or matching a regular expression:
-
-select * from t where t.foo *= 'bar';
-select * from t where t.foo **~ '^ba[rz]';
-
-The scheme is quite general, each operator which operates on a base type can
-be iterated over the elements of an array. It seem to work well but defining
-each new operators requires writing a different C function. Furthermore in
-each function there are two hardcoded OIDs which reference a base type and
-a procedure. Not very portable. Can anyone suggest a better and more portable
-way to do it ?  Do you think this could be a useful feature for next release ?
-Here is my code, it can be compiled and loaded as a dynamic module without
-need to recompile the backend. I have defined only the few operators I needed,
-the list can be extended. Feddback is welcome.
-