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-Array iterator functions, by Massimo Dal Zotto <dz@cs.unitn.it>
-Copyright (C) 1999, Massimo Dal Zotto <dz@cs.unitn.it>
-
-This software is distributed under the GNU General Public License
-either version 2, or (at your option) any later version.
-
-
-This loadable module defines a new class of functions which take
-an array and a scalar value, iterate a scalar operator over the
-elements of the array and the value, and compute a result as
-the logical OR or AND of the iteration results.
-For example array_int4eq returns true if some of the elements
-of an array of int4 is equal to the given value:
-
-	array_int4eq({1,2,3}, 1)  -->  true
-	array_int4eq({1,2,3}, 4)  -->  false
-
-If we have defined T array types and O scalar operators we can
-define T x O x 2 array functions, each of them has a name like
-"array_[all_]<basetype><operation>" and takes an array of type T
-iterating the operator O over all the elements. Note however
-that some of the possible combination are invalid, for example
-the array_int4_like because there is no like operator for int4.
-
-We can then define new operators based on these functions and use
-them to write queries with qualification clauses based on the
-values of some of the elements of an array.
-For example to select rows having some or all element of an array
-attribute equal to a given value or matching a regular expression:
-
-	create table t(id int4[], txt text[]);
-
-	-- select tuples with some id element equal to 123
-	select * from t where t.id *= 123;
-
-	-- select tuples with some txt element matching '[a-z]'
-	select * from t where t.txt *~ '[a-z]';
-
-	-- select tuples with all txt elements matching '^[A-Z]'
-	select * from t where t.txt[1:3] **~ '^[A-Z]';
-
-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 ?
-
-See also array_iterator.sql for an example on how to use this module.