Teach planner and executor to handle ScalarArrayOpExpr as an indexable

qualification when the underlying operator is indexable and useOr is true.
That is, indexkey op ANY (ARRAY[...]) is effectively translated into an
OR combination of one indexscan for each array element.  This only works
for bitmap index scans, of course, since regular indexscans no longer
support OR'ing of scans.  There are still some loose ends to clean up
before changing 'x IN (list)' to translate as a ScalarArrayOpExpr;
for instance predtest.c ought to be taught about it.  But this gets the
basic functionality in place.

src/include/utils/selfuncs.h

@@ -8,7 +8,7 @@
  * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/utils/selfuncs.h,v 1.25 2005/11/07 17:36:47 tgl Exp $
+ * $PostgreSQL: pgsql/src/include/utils/selfuncs.h,v 1.26 2005/11/25 19:47:50 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -112,6 +112,10 @@ extern Selectivity booltestsel(PlannerInfo *root, BoolTestType booltesttype,
 			Node *arg, int varRelid, JoinType jointype);
 extern Selectivity nulltestsel(PlannerInfo *root, NullTestType nulltesttype,
 			Node *arg, int varRelid);
+extern Selectivity scalararraysel(PlannerInfo *root,
+								  ScalarArrayOpExpr *clause,
+								  bool is_join_clause,
+								  int varRelid, JoinType jointype);
 
 extern void mergejoinscansel(PlannerInfo *root, Node *clause,
 				 Selectivity *leftscan,