This commit was manufactured by cvs2git to create branch 'ecpg_big_bison'.

Sprout from master 2002-06-20 20:29:54 UTC Bruce Momjian <bruce@momjian.us> 'Update copyright to 2002.'
Delete:
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diff --git a/src/backend/optimizer/path/indxpath.c b/src/backend/optimizer/path/indxpath.c
deleted file mode 100644
index baeed1f34b2..00000000000
--- a/src/backend/optimizer/path/indxpath.c
+++ /dev/null
@@ -1,2188 +0,0 @@
-/*-------------------------------------------------------------------------
- *
- * indxpath.c
- *	  Routines to determine which indices are usable for scanning a
- *	  given relation, and create IndexPaths accordingly.
- *
- * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
- * Portions Copyright (c) 1994, Regents of the University of California
- *
- *
- * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/optimizer/path/indxpath.c,v 1.119 2002/06/20 20:29:29 momjian Exp $
- *
- *-------------------------------------------------------------------------
- */
-#include "postgres.h"
-
-#include <math.h>
-
-#include "access/heapam.h"
-#include "access/nbtree.h"
-#include "catalog/catname.h"
-#include "catalog/pg_amop.h"
-#include "catalog/pg_namespace.h"
-#include "catalog/pg_operator.h"
-#include "executor/executor.h"
-#include "nodes/makefuncs.h"
-#include "nodes/nodeFuncs.h"
-#include "optimizer/clauses.h"
-#include "optimizer/cost.h"
-#include "optimizer/pathnode.h"
-#include "optimizer/paths.h"
-#include "optimizer/restrictinfo.h"
-#include "optimizer/var.h"
-#include "parser/parse_coerce.h"
-#include "parser/parse_expr.h"
-#include "parser/parse_oper.h"
-#include "utils/builtins.h"
-#include "utils/fmgroids.h"
-#include "utils/lsyscache.h"
-#include "utils/selfuncs.h"
-#include "utils/syscache.h"
-
-
-/*
- * DoneMatchingIndexKeys() - MACRO
- *
- * Determine whether we should continue matching index keys in a clause.
- * Depends on if there are more to match or if this is a functional index.
- * In the latter case we stop after the first match since there can
- * be only 1 key (i.e. the function's return value) and the attributes in
- * keys list represent the arguments to the function.  -mer 3 Oct. 1991
- */
-#define DoneMatchingIndexKeys(indexkeys, index) \
-		(indexkeys[0] == 0 || \
-		 (index->indproc != InvalidOid))
-
-#define is_indexable_operator(clause,opclass,indexkey_on_left) \
-	(indexable_operator(clause,opclass,indexkey_on_left) != InvalidOid)
-
-
-static void match_index_orclauses(RelOptInfo *rel, IndexOptInfo *index,
-					  List *restrictinfo_list);
-static List *match_index_orclause(RelOptInfo *rel, IndexOptInfo *index,
-					 List *or_clauses,
-					 List *other_matching_indices);
-static bool match_or_subclause_to_indexkey(RelOptInfo *rel,
-							   IndexOptInfo *index,
-							   Expr *clause);
-static List *group_clauses_by_indexkey(RelOptInfo *rel, IndexOptInfo *index,
-						  int *indexkeys, Oid *classes,
-						  List *restrictinfo_list);
-static List *group_clauses_by_ikey_for_joins(RelOptInfo *rel,
-								IndexOptInfo *index,
-								int *indexkeys, Oid *classes,
-								List *join_cinfo_list,
-								List *restr_cinfo_list);
-static bool match_clause_to_indexkey(RelOptInfo *rel, IndexOptInfo *index,
-						 int indexkey, Oid opclass,
-						 Expr *clause, bool join);
-static bool pred_test(List *predicate_list, List *restrictinfo_list,
-		  List *joininfo_list);
-static bool pred_test_restrict_list(Expr *predicate, List *restrictinfo_list);
-static bool pred_test_recurse_clause(Expr *predicate, Node *clause);
-static bool pred_test_recurse_pred(Expr *predicate, Node *clause);
-static bool pred_test_simple_clause(Expr *predicate, Node *clause);
-static void indexable_joinclauses(RelOptInfo *rel, IndexOptInfo *index,
-					  List *joininfo_list, List *restrictinfo_list,
-					  List **clausegroups, List **outerrelids);
-static List *index_innerjoin(Query *root, RelOptInfo *rel, IndexOptInfo *index,
-				List *clausegroup_list, List *outerrelids_list);
-static bool match_index_to_operand(int indexkey, Var *operand,
-					   RelOptInfo *rel, IndexOptInfo *index);
-static bool function_index_operand(Expr *funcOpnd, RelOptInfo *rel,
-					   IndexOptInfo *index);
-static bool match_special_index_operator(Expr *clause, Oid opclass,
-							 bool indexkey_on_left);
-static List *prefix_quals(Var *leftop, Oid expr_op,
-			 char *prefix, Pattern_Prefix_Status pstatus);
-static List *network_prefix_quals(Var *leftop, Oid expr_op, Datum rightop);
-static Oid	find_operator(const char *opname, Oid datatype);
-static Datum string_to_datum(const char *str, Oid datatype);
-static Const *string_to_const(const char *str, Oid datatype);
-
-
-/*
- * create_index_paths()
- *	  Generate all interesting index paths for the given relation.
- *	  Candidate paths are added to the rel's pathlist (using add_path).
- *	  Additional IndexPath nodes may also be added to rel's innerjoin list.
- *
- * To be considered for an index scan, an index must match one or more
- * restriction clauses or join clauses from the query's qual condition,
- * or match the query's ORDER BY condition.
- *
- * There are two basic kinds of index scans.  A "plain" index scan uses
- * only restriction clauses (possibly none at all) in its indexqual,
- * so it can be applied in any context.  An "innerjoin" index scan uses
- * join clauses (plus restriction clauses, if available) in its indexqual.
- * Therefore it can only be used as the inner relation of a nestloop
- * join against an outer rel that includes all the other rels mentioned
- * in its join clauses.  In that context, values for the other rels'
- * attributes are available and fixed during any one scan of the indexpath.
- *
- * An IndexPath is generated and submitted to add_path() for each index
- * this routine deems potentially interesting for the current query.
- * An innerjoin path is also generated for each interesting combination of
- * outer join relations.  The innerjoin paths are *not* passed to add_path(),
- * but are appended to the "innerjoin" list of the relation for later
- * consideration in nested-loop joins.
- *
- * 'rel' is the relation for which we want to generate index paths
- */
-void
-create_index_paths(Query *root, RelOptInfo *rel)
-{
-	List	   *restrictinfo_list = rel->baserestrictinfo;
-	List	   *joininfo_list = rel->joininfo;
-	List	   *ilist;
-
-	foreach(ilist, rel->indexlist)
-	{
-		IndexOptInfo *index = (IndexOptInfo *) lfirst(ilist);
-		List	   *restrictclauses;
-		List	   *index_pathkeys;
-		List	   *useful_pathkeys;
-		bool		index_is_ordered;
-		List	   *joinclausegroups;
-		List	   *joinouterrelids;
-
-		/*
-		 * If this is a partial index, we can only use it if it passes the
-		 * predicate test.
-		 */
-		if (index->indpred != NIL)
-			if (!pred_test(index->indpred, restrictinfo_list, joininfo_list))
-				continue;
-
-		/*
-		 * 1. Try matching the index against subclauses of restriction
-		 * 'or' clauses (ie, 'or' clauses that reference only this
-		 * relation). The restrictinfo nodes for the 'or' clauses are
-		 * marked with lists of the matching indices.  No paths are
-		 * actually created now; that will be done in orindxpath.c after
-		 * all indexes for the rel have been examined.	(We need to do it
-		 * that way because we can potentially use a different index for
-		 * each subclause of an 'or', so we can't build a path for an 'or'
-		 * clause until all indexes have been matched against it.)
-		 *
-		 * We don't even think about special handling of 'or' clauses that
-		 * involve more than one relation (ie, are join clauses). Can we
-		 * do anything useful with those?
-		 */
-		match_index_orclauses(rel, index, restrictinfo_list);
-
-		/*
-		 * 2. Match the index against non-'or' restriction clauses.
-		 */
-		restrictclauses = group_clauses_by_indexkey(rel,
-													index,
-													index->indexkeys,
-													index->classlist,
-													restrictinfo_list);
-
-		/*
-		 * 3. Compute pathkeys describing index's ordering, if any, then
-		 * see how many of them are actually useful for this query.
-		 */
-		index_pathkeys = build_index_pathkeys(root, rel, index,
-											  ForwardScanDirection);
-		index_is_ordered = (index_pathkeys != NIL);
-		useful_pathkeys = truncate_useless_pathkeys(root, rel,
-													index_pathkeys);
-
-		/*
-		 * 4. Generate an indexscan path if there are relevant restriction
-		 * clauses OR the index ordering is potentially useful for later
-		 * merging or final output ordering.
-		 *
-		 * If there is a predicate, consider it anyway since the index
-		 * predicate has already been found to match the query.  The
-		 * selectivity of the predicate might alone make the index useful.
-		 */
-		if (restrictclauses != NIL ||
-			useful_pathkeys != NIL ||
-			index->indpred != NIL)
-			add_path(rel, (Path *)
-					 create_index_path(root, rel, index,
-									   restrictclauses,
-									   useful_pathkeys,
-									   index_is_ordered ?
-									   ForwardScanDirection :
-									   NoMovementScanDirection));
-
-		/*
-		 * 5. If the index is ordered, a backwards scan might be
-		 * interesting. Currently this is only possible for a DESC query
-		 * result ordering.
-		 */
-		if (index_is_ordered)
-		{
-			index_pathkeys = build_index_pathkeys(root, rel, index,
-												  BackwardScanDirection);
-			useful_pathkeys = truncate_useless_pathkeys(root, rel,
-														index_pathkeys);
-			if (useful_pathkeys != NIL)
-				add_path(rel, (Path *)
-						 create_index_path(root, rel, index,
-										   restrictclauses,
-										   useful_pathkeys,
-										   BackwardScanDirection));
-		}
-
-		/*
-		 * 6. Create an innerjoin index path for each combination of other
-		 * rels used in available join clauses.  These paths will be
-		 * considered as the inner side of nestloop joins against those
-		 * sets of other rels.	indexable_joinclauses() finds sets of
-		 * clauses that can be used with each combination of outer rels,
-		 * and index_innerjoin builds the paths themselves.  We add the
-		 * paths to the rel's innerjoin list, NOT to the result list.
-		 */
-		indexable_joinclauses(rel, index,
-							  joininfo_list, restrictinfo_list,
-							  &joinclausegroups,
-							  &joinouterrelids);
-		if (joinclausegroups != NIL)
-		{
-			rel->innerjoin = nconc(rel->innerjoin,
-								   index_innerjoin(root, rel, index,
-												   joinclausegroups,
-												   joinouterrelids));
-		}
-	}
-}
-
-
-/****************************************************************************
- *		----  ROUTINES TO PROCESS 'OR' CLAUSES	----
- ****************************************************************************/
-
-
-/*
- * match_index_orclauses
- *	  Attempt to match an index against subclauses within 'or' clauses.
- *	  Each subclause that does match is marked with the index's node.
- *
- *	  Essentially, this adds 'index' to the list of subclause indices in
- *	  the RestrictInfo field of each of the 'or' clauses where it matches.
- *	  NOTE: we can use storage in the RestrictInfo for this purpose because
- *	  this processing is only done on single-relation restriction clauses.
- *	  Therefore, we will never have indexes for more than one relation
- *	  mentioned in the same RestrictInfo node's list.
- *
- * 'rel' is the node of the relation on which the index is defined.
- * 'index' is the index node.
- * 'restrictinfo_list' is the list of available restriction clauses.
- */
-static void
-match_index_orclauses(RelOptInfo *rel,
-					  IndexOptInfo *index,
-					  List *restrictinfo_list)
-{
-	List	   *i;
-
-	foreach(i, restrictinfo_list)
-	{
-		RestrictInfo *restrictinfo = (RestrictInfo *) lfirst(i);
-
-		if (restriction_is_or_clause(restrictinfo))
-		{
-			/*
-			 * Add this index to the subclause index list for each
-			 * subclause that it matches.
-			 */
-			restrictinfo->subclauseindices =
-				match_index_orclause(rel, index,
-									 restrictinfo->clause->args,
-									 restrictinfo->subclauseindices);
-		}
-	}
-}
-
-/*
- * match_index_orclause
- *	  Attempts to match an index against the subclauses of an 'or' clause.
- *
- *	  A match means that:
- *	  (1) the operator within the subclause can be used with the
- *		  index's specified operator class, and
- *	  (2) one operand of the subclause matches the index key.
- *
- *	  If a subclause is an 'and' clause, then it matches if any of its
- *	  subclauses is an opclause that matches.
- *
- * 'or_clauses' is the list of subclauses within the 'or' clause
- * 'other_matching_indices' is the list of information on other indices
- *		that have already been matched to subclauses within this
- *		particular 'or' clause (i.e., a list previously generated by
- *		this routine), or NIL if this routine has not previously been
- *		run for this 'or' clause.
- *
- * Returns a list of the form ((a b c) (d e f) nil (g h) ...) where
- * a,b,c are nodes of indices that match the first subclause in
- * 'or-clauses', d,e,f match the second subclause, no indices
- * match the third, g,h match the fourth, etc.
- */
-static List *
-match_index_orclause(RelOptInfo *rel,
-					 IndexOptInfo *index,
-					 List *or_clauses,
-					 List *other_matching_indices)
-{
-	List	   *matching_indices;
-	List	   *index_list;
-	List	   *clist;
-
-	/*
-	 * first time through, we create list of same length as OR clause,
-	 * containing an empty sublist for each subclause.
-	 */
-	if (!other_matching_indices)
-	{
-		matching_indices = NIL;
-		foreach(clist, or_clauses)
-			matching_indices = lcons(NIL, matching_indices);
-	}
-	else
-		matching_indices = other_matching_indices;
-
-	index_list = matching_indices;
-
-	foreach(clist, or_clauses)
-	{
-		Expr	   *clause = lfirst(clist);
-
-		if (match_or_subclause_to_indexkey(rel, index, clause))
-		{
-			/* OK to add this index to sublist for this subclause */
-			lfirst(matching_indices) = lcons(index,
-											 lfirst(matching_indices));
-		}
-
-		matching_indices = lnext(matching_indices);
-	}
-
-	return index_list;
-}
-
-/*
- * See if a subclause of an OR clause matches an index.
- *
- * We accept the subclause if it is an operator clause that matches the
- * index, or if it is an AND clause any of whose members is an opclause
- * that matches the index.
- *
- * For multi-key indexes, we only look for matches to the first key;
- * without such a match the index is useless.  If the clause is an AND
- * then we may be able to extract additional subclauses to use with the
- * later indexkeys, but we need not worry about that until
- * extract_or_indexqual_conditions() is called (if it ever is).
- */
-static bool
-match_or_subclause_to_indexkey(RelOptInfo *rel,
-							   IndexOptInfo *index,
-							   Expr *clause)
-{
-	int			indexkey = index->indexkeys[0];
-	Oid			opclass = index->classlist[0];
-
-	if (and_clause((Node *) clause))
-	{
-		List	   *item;
-
-		foreach(item, clause->args)
-		{
-			if (match_clause_to_indexkey(rel, index, indexkey, opclass,
-										 lfirst(item), false))
-				return true;
-		}
-		return false;
-	}
-	else
-		return match_clause_to_indexkey(rel, index, indexkey, opclass,
-										clause, false);
-}
-
-/*----------
- * Given an OR subclause that has previously been determined to match
- * the specified index, extract a list of specific opclauses that can be
- * used as indexquals.
- *
- * In the simplest case this just means making a one-element list of the
- * given opclause.	However, if the OR subclause is an AND, we have to
- * scan it to find the opclause(s) that match the index.  (There should
- * be at least one, if match_or_subclause_to_indexkey succeeded, but there
- * could be more.)
- *
- * Also, we can look at other restriction clauses of the rel to discover
- * additional candidate indexquals: for example, consider
- *			... where (a = 11 or a = 12) and b = 42;
- * If we are dealing with an index on (a,b) then we can include the clause
- * b = 42 in the indexqual list generated for each of the OR subclauses.
- * Essentially, we are making an index-specific transformation from CNF to
- * DNF.  (NOTE: when we do this, we end up with a slightly inefficient plan
- * because create_indexscan_plan is not very bright about figuring out which
- * restriction clauses are implied by the generated indexqual condition.
- * Currently we'll end up rechecking both the OR clause and the transferred
- * restriction clause as qpquals.  FIXME someday.)
- *
- * Also, we apply expand_indexqual_conditions() to convert any special
- * matching opclauses to indexable operators.
- *
- * The passed-in clause is not changed.
- *----------
- */
-List *
-extract_or_indexqual_conditions(RelOptInfo *rel,
-								IndexOptInfo *index,
-								Expr *orsubclause)
-{
-	List	   *quals = NIL;
-	int		   *indexkeys = index->indexkeys;
-	Oid		   *classes = index->classlist;
-
-	/*
-	 * Extract relevant indexclauses in indexkey order.  This is
-	 * essentially just like group_clauses_by_indexkey() except that the
-	 * input and output are lists of bare clauses, not of RestrictInfo
-	 * nodes.
-	 */
-	do
-	{
-		int			curIndxKey = indexkeys[0];
-		Oid			curClass = classes[0];
-		List	   *clausegroup = NIL;
-		List	   *item;
-
-		if (and_clause((Node *) orsubclause))
-		{
-			foreach(item, orsubclause->args)
-			{
-				Expr	   *subsubclause = (Expr *) lfirst(item);
-
-				if (match_clause_to_indexkey(rel, index,
-											 curIndxKey, curClass,
-											 subsubclause, false))
-					clausegroup = lappend(clausegroup, subsubclause);
-			}
-		}
-		else if (match_clause_to_indexkey(rel, index,
-										  curIndxKey, curClass,
-										  orsubclause, false))
-			clausegroup = makeList1(orsubclause);
-
-		/*
-		 * If we found no clauses for this indexkey in the OR subclause
-		 * itself, try looking in the rel's top-level restriction list.
-		 */
-		if (clausegroup == NIL)
-		{
-			foreach(item, rel->baserestrictinfo)
-			{
-				RestrictInfo *rinfo = (RestrictInfo *) lfirst(item);
-
-				if (match_clause_to_indexkey(rel, index,
-											 curIndxKey, curClass,
-											 rinfo->clause, false))
-					clausegroup = lappend(clausegroup, rinfo->clause);
-			}
-		}
-
-		/*
-		 * If still no clauses match this key, we're done; we don't want
-		 * to look at keys to its right.
-		 */
-		if (clausegroup == NIL)
-			break;
-
-		quals = nconc(quals, clausegroup);
-
-		indexkeys++;
-		classes++;
-	} while (!DoneMatchingIndexKeys(indexkeys, index));
-
-	if (quals == NIL)
-		elog(ERROR, "extract_or_indexqual_conditions: no matching clause");
-
-	return expand_indexqual_conditions(quals);
-}
-
-
-/****************************************************************************
- *				----  ROUTINES TO CHECK RESTRICTIONS  ----
- ****************************************************************************/
-
-
-/*
- * group_clauses_by_indexkey
- *	  Generates a list of restriction clauses that can be used with an index.
- *
- * 'rel' is the node of the relation itself.
- * 'index' is a index on 'rel'.
- * 'indexkeys' are the index keys to be matched.
- * 'classes' are the classes of the index operators on those keys.
- * 'restrictinfo_list' is the list of available restriction clauses for 'rel'.
- *
- * Returns a list of all the RestrictInfo nodes for clauses that can be
- * used with this index.
- *
- * The list is ordered by index key.  (This is not depended on by any part
- * of the planner, as far as I can tell; but some parts of the executor
- * do assume that the indxqual list ultimately delivered to the executor
- * is so ordered.  One such place is _bt_orderkeys() in the btree support.
- * Perhaps that ought to be fixed someday --- tgl 7/00)
- *
- * Note that in a multi-key index, we stop if we find a key that cannot be
- * used with any clause.  For example, given an index on (A,B,C), we might
- * return (C1 C2 C3 C4) if we find that clauses C1 and C2 use column A,
- * clauses C3 and C4 use column B, and no clauses use column C.  But if
- * no clauses match B we will return (C1 C2), whether or not there are
- * clauses matching column C, because the executor couldn't use them anyway.
- */
-static List *
-group_clauses_by_indexkey(RelOptInfo *rel,
-						  IndexOptInfo *index,
-						  int *indexkeys,
-						  Oid *classes,
-						  List *restrictinfo_list)
-{
-	List	   *clausegroup_list = NIL;
-
-	if (restrictinfo_list == NIL || indexkeys[0] == 0)
-		return NIL;
-
-	do
-	{
-		int			curIndxKey = indexkeys[0];
-		Oid			curClass = classes[0];
-		List	   *clausegroup = NIL;
-		List	   *curCinfo;
-
-		foreach(curCinfo, restrictinfo_list)
-		{
-			RestrictInfo *rinfo = (RestrictInfo *) lfirst(curCinfo);
-
-			if (match_clause_to_indexkey(rel,
-										 index,
-										 curIndxKey,
-										 curClass,
-										 rinfo->clause,
-										 false))
-				clausegroup = lappend(clausegroup, rinfo);
-		}
-
-		/*
-		 * If no clauses match this key, we're done; we don't want to look
-		 * at keys to its right.
-		 */
-		if (clausegroup == NIL)
-			break;
-
-		clausegroup_list = nconc(clausegroup_list, clausegroup);
-
-		indexkeys++;
-		classes++;
-
-	} while (!DoneMatchingIndexKeys(indexkeys, index));
-
-	/* clausegroup_list holds all matched clauses ordered by indexkeys */
-	return clausegroup_list;
-}
-
-/*
- * group_clauses_by_ikey_for_joins
- *	  Generates a list of join clauses that can be used with an index
- *	  to scan the inner side of a nestloop join.
- *
- * This is much like group_clauses_by_indexkey(), but we consider both
- * join and restriction clauses.  For each indexkey in the index, we
- * accept both join and restriction clauses that match it, since both
- * will make useful indexquals if the index is being used to scan the
- * inner side of a nestloop join.  But there must be at least one matching
- * join clause, or we return NIL indicating that this index isn't useful
- * for nestloop joining.
- */
-static List *
-group_clauses_by_ikey_for_joins(RelOptInfo *rel,
-								IndexOptInfo *index,
-								int *indexkeys,
-								Oid *classes,
-								List *join_cinfo_list,
-								List *restr_cinfo_list)
-{
-	List	   *clausegroup_list = NIL;
-	bool		jfound = false;
-
-	if (join_cinfo_list == NIL || indexkeys[0] == 0)
-		return NIL;
-
-	do
-	{
-		int			curIndxKey = indexkeys[0];
-		Oid			curClass = classes[0];
-		List	   *clausegroup = NIL;
-		List	   *curCinfo;
-
-		foreach(curCinfo, join_cinfo_list)
-		{
-			RestrictInfo *rinfo = (RestrictInfo *) lfirst(curCinfo);
-
-			if (match_clause_to_indexkey(rel,
-										 index,
-										 curIndxKey,
-										 curClass,
-										 rinfo->clause,
-										 true))
-			{
-				clausegroup = lappend(clausegroup, rinfo);
-				jfound = true;
-			}
-		}
-		foreach(curCinfo, restr_cinfo_list)
-		{
-			RestrictInfo *rinfo = (RestrictInfo *) lfirst(curCinfo);
-
-			if (match_clause_to_indexkey(rel,
-										 index,
-										 curIndxKey,
-										 curClass,
-										 rinfo->clause,
-										 false))
-				clausegroup = lappend(clausegroup, rinfo);
-		}
-
-		/*
-		 * If no clauses match this key, we're done; we don't want to look
-		 * at keys to its right.
-		 */
-		if (clausegroup == NIL)
-			break;
-
-		clausegroup_list = nconc(clausegroup_list, clausegroup);
-
-		indexkeys++;
-		classes++;
-
-	} while (!DoneMatchingIndexKeys(indexkeys, index));
-
-	/*
-	 * if no join clause was matched then there ain't clauses for joins at
-	 * all.
-	 */
-	if (!jfound)
-	{
-		freeList(clausegroup_list);
-		return NIL;
-	}
-
-	/* clausegroup_list holds all matched clauses ordered by indexkeys */
-	return clausegroup_list;
-}
-
-
-/*
- * match_clause_to_indexkey()
- *	  Determines whether a restriction or join clause matches
- *	  a key of an index.
- *
- *	  To match, the clause:
- *
- *	  (1a) for a restriction clause: must be in the form (indexkey op const)
- *		   or (const op indexkey), or
- *	  (1b) for a join clause: must be in the form (indexkey op others)
- *		   or (others op indexkey), where others is an expression involving
- *		   only vars of the other relation(s); and
- *	  (2)  must contain an operator which is in the same class as the index
- *		   operator for this key, or is a "special" operator as recognized
- *		   by match_special_index_operator().
- *
- *	  Presently, the executor can only deal with indexquals that have the
- *	  indexkey on the left, so we can only use clauses that have the indexkey
- *	  on the right if we can commute the clause to put the key on the left.
- *	  We do not actually do the commuting here, but we check whether a
- *	  suitable commutator operator is available.
- *
- *	  Note that in the join case, we already know that the clause as a
- *	  whole uses vars from the interesting set of relations.  But we need
- *	  to defend against expressions like (a.f1 OP (b.f2 OP a.f3)); that's
- *	  not processable by an indexscan nestloop join, whereas
- *	  (a.f1 OP (b.f2 OP c.f3)) is.
- *
- * 'rel' is the relation of interest.
- * 'index' is an index on 'rel'.
- * 'indexkey' is a key of 'index'.
- * 'opclass' is the corresponding operator class.
- * 'clause' is the clause to be tested.
- * 'join' is true if we are considering this clause for joins.
- *
- * Returns true if the clause can be used with this index key.
- *
- * NOTE:  returns false if clause is an OR or AND clause; it is the
- * responsibility of higher-level routines to cope with those.
- */
-static bool
-match_clause_to_indexkey(RelOptInfo *rel,
-						 IndexOptInfo *index,
-						 int indexkey,
-						 Oid opclass,
-						 Expr *clause,
-						 bool join)
-{
-	Var		   *leftop,
-			   *rightop;
-
-	/* Clause must be a binary opclause. */
-	if (!is_opclause((Node *) clause))
-		return false;
-	leftop = get_leftop(clause);
-	rightop = get_rightop(clause);
-	if (!leftop || !rightop)
-		return false;
-
-	if (!join)
-	{
-		/*
-		 * Not considering joins, so check for clauses of the form:
-		 * (indexkey operator constant) or (constant operator indexkey).
-		 * Anything that is a "pseudo constant" expression will do.
-		 */
-
-		if (match_index_to_operand(indexkey, leftop, rel, index) &&
-			is_pseudo_constant_clause((Node *) rightop))
-		{
-			if (is_indexable_operator(clause, opclass, true))
-				return true;
-
-			/*
-			 * If we didn't find a member of the index's opclass, see
-			 * whether it is a "special" indexable operator.
-			 */
-			if (match_special_index_operator(clause, opclass, true))
-				return true;
-			return false;
-		}
-		if (match_index_to_operand(indexkey, rightop, rel, index) &&
-			is_pseudo_constant_clause((Node *) leftop))
-		{
-			if (is_indexable_operator(clause, opclass, false))
-				return true;
-
-			/*
-			 * If we didn't find a member of the index's opclass, see
-			 * whether it is a "special" indexable operator.
-			 */
-			if (match_special_index_operator(clause, opclass, false))
-				return true;
-			return false;
-		}
-	}
-	else
-	{
-		/*
-		 * Check for an indexqual that could be handled by a nestloop
-		 * join. We need the index key to be compared against an
-		 * expression that uses none of the indexed relation's vars and
-		 * contains no volatile functions.
-		 */
-		if (match_index_to_operand(indexkey, leftop, rel, index))
-		{
-			List	   *othervarnos = pull_varnos((Node *) rightop);
-			bool		isIndexable;
-
-			isIndexable =
-				!intMember(lfirsti(rel->relids), othervarnos) &&
-				!contain_volatile_functions((Node *) rightop) &&
-				is_indexable_operator(clause, opclass, true);
-			freeList(othervarnos);
-			return isIndexable;
-		}
-		else if (match_index_to_operand(indexkey, rightop, rel, index))
-		{
-			List	   *othervarnos = pull_varnos((Node *) leftop);
-			bool		isIndexable;
-
-			isIndexable =
-				!intMember(lfirsti(rel->relids), othervarnos) &&
-				!contain_volatile_functions((Node *) leftop) &&
-				is_indexable_operator(clause, opclass, false);
-			freeList(othervarnos);
-			return isIndexable;
-		}
-	}
-
-	return false;
-}
-
-/*
- * indexable_operator
- *	  Does a binary opclause contain an operator matching the index opclass?
- *
- * If the indexkey is on the right, what we actually want to know
- * is whether the operator has a commutator operator that matches
- * the index's opclass.
- *
- * We try both the straightforward match and matches that rely on
- * recognizing binary-compatible datatypes.  For example, if we have
- * an expression like "oid = 123", the operator will be oideqint4,
- * which we need to replace with oideq in order to recognize it as
- * matching an oid_ops index on the oid field.	A variant case is where
- * the expression is like "oid::int4 = 123", where the given operator
- * will be int4eq and again we need to intuit that we want to use oideq.
- *
- * Returns the OID of the matching operator, or InvalidOid if no match.
- * Note that the returned OID will be different from the one in the given
- * expression if we used a binary-compatible substitution.	Also note that
- * if indexkey_on_left is FALSE (meaning we need to commute), the returned
- * OID is *not* commuted; it can be plugged directly into the given clause.
- */
-Oid
-indexable_operator(Expr *clause, Oid opclass, bool indexkey_on_left)
-{
-	Oid			expr_op = ((Oper *) clause->oper)->opno;
-	Oid			commuted_op,
-				new_op;
-	Operator	oldoptup;
-	Form_pg_operator oldopform;
-	char	   *opname;
-	Oid			ltype,
-				rtype,
-				indexkeytype;
-
-	/* Get the commuted operator if necessary */
-	if (indexkey_on_left)
-		commuted_op = expr_op;
-	else
-		commuted_op = get_commutator(expr_op);
-	if (commuted_op == InvalidOid)
-		return InvalidOid;
-
-	/* Done if the (commuted) operator is a member of the index's opclass */
-	if (op_in_opclass(commuted_op, opclass))
-		return expr_op;
-
-	/*
-	 * Maybe the index uses a binary-compatible operator set.
-	 *
-	 * Get the nominal input types of the given operator and the actual type
-	 * (before binary-compatible relabeling) of the index key.
-	 */
-	oldoptup = SearchSysCache(OPEROID,
-							  ObjectIdGetDatum(expr_op),
-							  0, 0, 0);
-	if (!HeapTupleIsValid(oldoptup))
-		return InvalidOid;		/* probably can't happen */
-	oldopform = (Form_pg_operator) GETSTRUCT(oldoptup);
-	opname = pstrdup(NameStr(oldopform->oprname));
-	ltype = oldopform->oprleft;
-	rtype = oldopform->oprright;
-	ReleaseSysCache(oldoptup);
-
-	if (indexkey_on_left)
-	{
-		Node	   *leftop = (Node *) get_leftop(clause);
-
-		if (leftop && IsA(leftop, RelabelType))
-			leftop = ((RelabelType *) leftop)->arg;
-		indexkeytype = exprType(leftop);
-	}
-	else
-	{
-		Node	   *rightop = (Node *) get_rightop(clause);
-
-		if (rightop && IsA(rightop, RelabelType))
-			rightop = ((RelabelType *) rightop)->arg;
-		indexkeytype = exprType(rightop);
-	}
-
-	/*
-	 * Make sure we have different but binary-compatible types.
-	 */
-	if (ltype == indexkeytype && rtype == indexkeytype)
-		return InvalidOid;		/* no chance for a different operator */
-	if (!IsBinaryCompatible(ltype, indexkeytype))
-		return InvalidOid;
-	if (!IsBinaryCompatible(rtype, indexkeytype))
-		return InvalidOid;
-
-	/*
-	 * OK, look for operator of the same name with the indexkey's data
-	 * type. (In theory this might find a non-semantically-comparable
-	 * operator, but in practice that seems pretty unlikely for
-	 * binary-compatible types.)
-	 */
-	new_op = compatible_oper_opid(makeList1(makeString(opname)),
-								  indexkeytype, indexkeytype, true);
-
-	if (OidIsValid(new_op))
-	{
-		if (new_op != expr_op)
-		{
-			/*
-			 * OK, we found a binary-compatible operator of the same name;
-			 * now does it match the index?
-			 */
-			if (indexkey_on_left)
-				commuted_op = new_op;
-			else
-				commuted_op = get_commutator(new_op);
-			if (commuted_op == InvalidOid)
-				return InvalidOid;
-
-			if (op_in_opclass(commuted_op, opclass))
-				return new_op;
-		}
-	}
-
-	return InvalidOid;
-}
-
-/****************************************************************************
- *				----  ROUTINES TO DO PARTIAL INDEX PREDICATE TESTS	----
- ****************************************************************************/
-
-/*
- * pred_test
- *	  Does the "predicate inclusion test" for partial indexes.
- *
- *	  Recursively checks whether the clauses in restrictinfo_list imply
- *	  that the given predicate is true.
- *
- *	  This routine (together with the routines it calls) iterates over
- *	  ANDs in the predicate first, then reduces the qualification
- *	  clauses down to their constituent terms, and iterates over ORs
- *	  in the predicate last.  This order is important to make the test
- *	  succeed whenever possible (assuming the predicate has been converted
- *	  to CNF format). --Nels, Jan '93
- */
-static bool
-pred_test(List *predicate_list, List *restrictinfo_list, List *joininfo_list)
-{
-	List	   *pred;
-
-	/*
-	 * Note: if Postgres tried to optimize queries by forming equivalence
-	 * classes over equi-joined attributes (i.e., if it recognized that a
-	 * qualification such as "where a.b=c.d and a.b=5" could make use of
-	 * an index on c.d), then we could use that equivalence class info
-	 * here with joininfo_list to do more complete tests for the usability
-	 * of a partial index.	For now, the test only uses restriction
-	 * clauses (those in restrictinfo_list). --Nels, Dec '92
-	 *
-	 * XXX as of 7.1, equivalence class info *is* available.  Consider
-	 * improving this code as foreseen by Nels.
-	 */
-
-	if (predicate_list == NIL)
-		return true;			/* no predicate: the index is usable */
-	if (restrictinfo_list == NIL)
-		return false;			/* no restriction clauses: the test must
-								 * fail */
-
-	foreach(pred, predicate_list)
-	{
-		/*
-		 * if any clause is not implied, the whole predicate is not
-		 * implied.  Note we assume that any sub-ANDs have been flattened
-		 * when the predicate was fed through canonicalize_qual().
-		 */
-		if (!pred_test_restrict_list(lfirst(pred), restrictinfo_list))
-			return false;
-	}
-	return true;
-}
-
-
-/*
- * pred_test_restrict_list
- *	  Does the "predicate inclusion test" for one conjunct of a predicate
- *	  expression.
- */
-static bool
-pred_test_restrict_list(Expr *predicate, List *restrictinfo_list)
-{
-	List	   *item;
-
-	foreach(item, restrictinfo_list)
-	{
-		RestrictInfo *restrictinfo = (RestrictInfo *) lfirst(item);
-
-		/* if any clause implies the predicate, return true */
-		if (pred_test_recurse_clause(predicate,
-									 (Node *) restrictinfo->clause))
-			return true;
-	}
-	return false;
-}
-
-
-/*
- * pred_test_recurse_clause
- *	  Does the "predicate inclusion test" for a general restriction-clause
- *	  expression.  Here we recursively deal with the possibility that the
- *	  restriction clause is itself an AND or OR structure.
- */
-static bool
-pred_test_recurse_clause(Expr *predicate, Node *clause)
-{
-	List	   *items,
-			   *item;
-
-	Assert(clause != NULL);
-	if (or_clause(clause))
-	{
-		items = ((Expr *) clause)->args;
-		foreach(item, items)
-		{
-			/* if any OR item doesn't imply the predicate, clause doesn't */
-			if (!pred_test_recurse_clause(predicate, lfirst(item)))
-				return false;
-		}
-		return true;
-	}
-	else if (and_clause(clause))
-	{
-		items = ((Expr *) clause)->args;
-		foreach(item, items)
-		{
-			/*
-			 * if any AND item implies the predicate, the whole clause
-			 * does
-			 */
-			if (pred_test_recurse_clause(predicate, lfirst(item)))
-				return true;
-		}
-		return false;
-	}
-	else
-		return pred_test_recurse_pred(predicate, clause);
-}
-
-
-/*
- * pred_test_recurse_pred
- *	  Does the "predicate inclusion test" for one conjunct of a predicate
- *	  expression for a simple restriction clause.  Here we recursively deal
- *	  with the possibility that the predicate conjunct is itself an AND or
- *	  OR structure.
- */
-static bool
-pred_test_recurse_pred(Expr *predicate, Node *clause)
-{
-	List	   *items,
-			   *item;
-
-	Assert(predicate != NULL);
-	if (or_clause((Node *) predicate))
-	{
-		items = predicate->args;
-		foreach(item, items)
-		{
-			/* if any item is implied, the whole predicate is implied */
-			if (pred_test_recurse_pred(lfirst(item), clause))
-				return true;
-		}
-		return false;
-	}
-	else if (and_clause((Node *) predicate))
-	{
-		items = predicate->args;
-		foreach(item, items)
-		{
-			/*
-			 * if any item is not implied, the whole predicate is not
-			 * implied
-			 */
-			if (!pred_test_recurse_pred(lfirst(item), clause))
-				return false;
-		}
-		return true;
-	}
-	else
-		return pred_test_simple_clause(predicate, clause);
-}
-
-
-/*
- * Define an "operator implication table" for btree operators ("strategies").
- * The "strategy numbers" are:	(1) <	(2) <=	 (3) =	 (4) >=   (5) >
- *
- * The interpretation of:
- *
- *		test_op = BT_implic_table[given_op-1][target_op-1]
- *
- * where test_op, given_op and target_op are strategy numbers (from 1 to 5)
- * of btree operators, is as follows:
- *
- *	 If you know, for some ATTR, that "ATTR given_op CONST1" is true, and you
- *	 want to determine whether "ATTR target_op CONST2" must also be true, then
- *	 you can use "CONST1 test_op CONST2" as a test.  If this test returns true,
- *	 then the target expression must be true; if the test returns false, then
- *	 the target expression may be false.
- *
- * An entry where test_op==0 means the implication cannot be determined, i.e.,
- * this test should always be considered false.
- */
-
-static const StrategyNumber
-			BT_implic_table[BTMaxStrategyNumber][BTMaxStrategyNumber] = {
-	{2, 2, 0, 0, 0},
-	{1, 2, 0, 0, 0},
-	{1, 2, 3, 4, 5},
-	{0, 0, 0, 4, 5},
-	{0, 0, 0, 4, 4}
-};
-
-
-/*
- * pred_test_simple_clause
- *	  Does the "predicate inclusion test" for a "simple clause" predicate
- *	  and a "simple clause" restriction.
- *
- *	  We have two strategies for determining whether one simple clause
- *	  implies another.	A simple and general way is to see if they are
- *	  equal(); this works for any kind of expression.  (Actually, there
- *	  is an implied assumption that the functions in the expression are
- *	  immutable, ie dependent only on their input arguments --- but this
- *	  was checked for the predicate by CheckPredicate().)
- *
- *	  Our other way works only for (binary boolean) operators that are
- *	  in some btree operator class.  We use the above operator implication
- *	  table to be able to derive implications between nonidentical clauses.
- *
- *	  Eventually, rtree operators could also be handled by defining an
- *	  appropriate "RT_implic_table" array.
- */
-static bool
-pred_test_simple_clause(Expr *predicate, Node *clause)
-{
-	Var		   *pred_var,
-			   *clause_var;
-	Const	   *pred_const,
-			   *clause_const;
-	Oid			pred_op,
-				clause_op,
-				test_op;
-	Oid			opclass_id = InvalidOid;
-	StrategyNumber pred_strategy = 0,
-				clause_strategy,
-				test_strategy;
-	Oper	   *test_oper;
-	Expr	   *test_expr;
-	Datum		test_result;
-	bool		isNull;
-	Relation	relation;
-	HeapScanDesc scan;
-	HeapTuple	tuple;
-	ScanKeyData entry[1];
-	Form_pg_amop aform;
-	ExprContext *econtext;
-
-	/* First try the equal() test */
-	if (equal((Node *) predicate, clause))
-		return true;
-
-	/*
-	 * Can't do anything more unless they are both binary opclauses with a
-	 * Var on the left and a Const on the right.
-	 */
-	if (!is_opclause((Node *) predicate))
-		return false;
-	pred_var = (Var *) get_leftop(predicate);
-	pred_const = (Const *) get_rightop(predicate);
-
-	if (!is_opclause(clause))
-		return false;
-	clause_var = (Var *) get_leftop((Expr *) clause);
-	clause_const = (Const *) get_rightop((Expr *) clause);
-
-	if (!IsA(clause_var, Var) ||
-		clause_const == NULL ||
-		!IsA(clause_const, Const) ||
-		!IsA(pred_var, Var) ||
-		pred_const == NULL ||
-		!IsA(pred_const, Const))
-		return false;
-
-	/*
-	 * The implication can't be determined unless the predicate and the
-	 * clause refer to the same attribute.
-	 */
-	if (clause_var->varno != pred_var->varno ||
-		clause_var->varattno != pred_var->varattno)
-		return false;
-
-	/* Get the operators for the two clauses we're comparing */
-	pred_op = ((Oper *) ((Expr *) predicate)->oper)->opno;
-	clause_op = ((Oper *) ((Expr *) clause)->oper)->opno;
-
-	/*
-	 * 1. Find a "btree" strategy number for the pred_op
-	 *
-	 * The following assumes that any given operator will only be in a single
-	 * btree operator class.  This is true at least for all the
-	 * pre-defined operator classes.  If it isn't true, then whichever
-	 * operator class happens to be returned first for the given operator
-	 * will be used to find the associated strategy numbers for the test.
-	 * --Nels, Jan '93
-	 */
-	ScanKeyEntryInitialize(&entry[0], 0x0,
-						   Anum_pg_amop_amopopr,
-						   F_OIDEQ,
-						   ObjectIdGetDatum(pred_op));
-
-	relation = heap_openr(AccessMethodOperatorRelationName, AccessShareLock);
-	scan = heap_beginscan(relation, SnapshotNow, 1, entry);
-
-	while ((tuple = heap_getnext(scan, ForwardScanDirection)) != NULL)
-	{
-		aform = (Form_pg_amop) GETSTRUCT(tuple);
-		if (opclass_is_btree(aform->amopclaid))
-		{
-			/* Get the predicate operator's btree strategy number (1 to 5) */
-			pred_strategy = (StrategyNumber) aform->amopstrategy;
-			Assert(pred_strategy >= 1 && pred_strategy <= 5);
-
-			/*
-			 * Remember which operator class this strategy number came
-			 * from
-			 */
-			opclass_id = aform->amopclaid;
-			break;
-		}
-	}
-
-	heap_endscan(scan);
-	heap_close(relation, AccessShareLock);
-
-	if (!OidIsValid(opclass_id))
-	{
-		/* predicate operator isn't btree-indexable */
-		return false;
-	}
-
-	/*
-	 * 2. From the same opclass, find a strategy num for the clause_op
-	 */
-	tuple = SearchSysCache(AMOPOPID,
-						   ObjectIdGetDatum(opclass_id),
-						   ObjectIdGetDatum(clause_op),
-						   0, 0);
-	if (!HeapTupleIsValid(tuple))
-	{
-		/* clause operator isn't btree-indexable, or isn't in this opclass */
-		return false;
-	}
-	aform = (Form_pg_amop) GETSTRUCT(tuple);
-
-	/* Get the restriction clause operator's strategy number (1 to 5) */
-	clause_strategy = (StrategyNumber) aform->amopstrategy;
-	Assert(clause_strategy >= 1 && clause_strategy <= 5);
-
-	ReleaseSysCache(tuple);
-
-	/*
-	 * 3. Look up the "test" strategy number in the implication table
-	 */
-	test_strategy = BT_implic_table[clause_strategy - 1][pred_strategy - 1];
-	if (test_strategy == 0)
-	{
-		return false;			/* the implication cannot be determined */
-	}
-
-	/*
-	 * 4. From the same opclass, find the operator for the test strategy
-	 */
-	tuple = SearchSysCache(AMOPSTRATEGY,
-						   ObjectIdGetDatum(opclass_id),
-						   Int16GetDatum(test_strategy),
-						   0, 0);
-	if (!HeapTupleIsValid(tuple))
-	{
-		/* this probably shouldn't fail? */
-		elog(LOG, "pred_test_simple_clause: unknown test_op");
-		return false;
-	}
-	aform = (Form_pg_amop) GETSTRUCT(tuple);
-
-	/* Get the test operator */
-	test_op = aform->amopopr;
-
-	ReleaseSysCache(tuple);
-
-	/*
-	 * 5. Evaluate the test
-	 */
-	test_oper = makeOper(test_op,		/* opno */
-						 InvalidOid,	/* opid */
-						 BOOLOID,		/* opresulttype */
-						 false);		/* opretset */
-	replace_opid(test_oper);
-	test_expr = make_opclause(test_oper,
-							  (Var *) clause_const,
-							  (Var *) pred_const);
-
-	econtext = MakeExprContext(NULL, TransactionCommandContext);
-	test_result = ExecEvalExprSwitchContext((Node *) test_expr, econtext,
-											&isNull, NULL);
-	FreeExprContext(econtext);
-
-	if (isNull)
-	{
-		elog(LOG, "pred_test_simple_clause: null test result");
-		return false;
-	}
-	return DatumGetBool(test_result);
-}
-
-
-/****************************************************************************
- *				----  ROUTINES TO CHECK JOIN CLAUSES  ----
- ****************************************************************************/
-
-/*
- * indexable_joinclauses
- *	  Finds all groups of join clauses from among 'joininfo_list' that can
- *	  be used in conjunction with 'index' for the inner scan of a nestjoin.
- *
- *	  Each clause group comes from a single joininfo node plus the current
- *	  rel's restrictinfo list.  Therefore, every clause in the group references
- *	  the current rel plus the same set of other rels (except for the restrict
- *	  clauses, which only reference the current rel).  Therefore, this set
- *	  of clauses could be used as an indexqual if the relation is scanned
- *	  as the inner side of a nestloop join when the outer side contains
- *	  (at least) all those "other rels".
- *
- *	  XXX Actually, given that we are considering a join that requires an
- *	  outer rel set (A,B,C), we should use all qual clauses that reference
- *	  any subset of these rels, not just the full set or none.	This is
- *	  doable with a doubly nested loop over joininfo_list; is it worth it?
- *
- * Returns two parallel lists of the same length: the clause groups,
- * and the required outer rel set for each one.
- *
- * 'rel' is the relation for which 'index' is defined
- * 'joininfo_list' is the list of JoinInfo nodes for 'rel'
- * 'restrictinfo_list' is the list of restriction clauses for 'rel'
- * '*clausegroups' receives a list of clause sublists
- * '*outerrelids' receives a list of relid lists
- */
-static void
-indexable_joinclauses(RelOptInfo *rel, IndexOptInfo *index,
-					  List *joininfo_list, List *restrictinfo_list,
-					  List **clausegroups, List **outerrelids)
-{
-	List	   *cg_list = NIL;
-	List	   *relid_list = NIL;
-	List	   *i;
-
-	foreach(i, joininfo_list)
-	{
-		JoinInfo   *joininfo = (JoinInfo *) lfirst(i);
-		List	   *clausegroup;
-
-		clausegroup = group_clauses_by_ikey_for_joins(rel,
-													  index,
-													  index->indexkeys,
-													  index->classlist,
-											joininfo->jinfo_restrictinfo,
-													  restrictinfo_list);
-
-		if (clausegroup != NIL)
-		{
-			cg_list = lappend(cg_list, clausegroup);
-			relid_list = lappend(relid_list, joininfo->unjoined_relids);
-		}
-	}
-
-	*clausegroups = cg_list;
-	*outerrelids = relid_list;
-}
-
-/****************************************************************************
- *				----  PATH CREATION UTILITIES  ----
- ****************************************************************************/
-
-/*
- * index_innerjoin
- *	  Creates index path nodes corresponding to paths to be used as inner
- *	  relations in nestloop joins.
- *
- * 'rel' is the relation for which 'index' is defined
- * 'clausegroup_list' is a list of lists of restrictinfo nodes which can use
- * 'index'.  Each sublist refers to the same set of outer rels.
- * 'outerrelids_list' is a list of the required outer rels for each sublist
- * of join clauses.
- *
- * Returns a list of index pathnodes.
- */
-static List *
-index_innerjoin(Query *root, RelOptInfo *rel, IndexOptInfo *index,
-				List *clausegroup_list, List *outerrelids_list)
-{
-	List	   *path_list = NIL;
-	List	   *i;
-
-	foreach(i, clausegroup_list)
-	{
-		List	   *clausegroup = lfirst(i);
-		IndexPath  *pathnode = makeNode(IndexPath);
-		List	   *indexquals = NIL;
-		bool		alljoinquals = true;
-		List	   *temp;
-
-		/* XXX this code ought to be merged with create_index_path? */
-
-		pathnode->path.pathtype = T_IndexScan;
-		pathnode->path.parent = rel;
-
-		/*
-		 * There's no point in marking the path with any pathkeys, since
-		 * it will only ever be used as the inner path of a nestloop, and
-		 * so its ordering does not matter.
-		 */
-		pathnode->path.pathkeys = NIL;
-
-		/* extract bare indexqual clauses, check whether all from JOIN/ON */
-		foreach(temp, clausegroup)
-		{
-			RestrictInfo *clause = (RestrictInfo *) lfirst(temp);
-
-			indexquals = lappend(indexquals, clause->clause);
-			if (clause->ispusheddown)
-				alljoinquals = false;
-		}
-
-		/* expand special operators to indexquals the executor can handle */
-		indexquals = expand_indexqual_conditions(indexquals);
-
-		/*
-		 * Note that we are making a pathnode for a single-scan indexscan;
-		 * therefore, both indexinfo and indexqual should be
-		 * single-element lists.
-		 */
-		pathnode->indexinfo = makeList1(index);
-		pathnode->indexqual = makeList1(indexquals);
-
-		/* We don't actually care what order the index scans in ... */
-		pathnode->indexscandir = NoMovementScanDirection;
-
-		/* joinrelids saves the rels needed on the outer side of the join */
-		pathnode->joinrelids = lfirst(outerrelids_list);
-
-		pathnode->alljoinquals = alljoinquals;
-
-		/*
-		 * We must compute the estimated number of output rows for the
-		 * indexscan.  This is less than rel->rows because of the
-		 * additional selectivity of the join clauses.	Since clausegroup
-		 * may contain both restriction and join clauses, we have to do a
-		 * set union to get the full set of clauses that must be
-		 * considered to compute the correct selectivity.  (We can't just
-		 * nconc the two lists; then we might have some restriction
-		 * clauses appearing twice, which'd mislead
-		 * restrictlist_selectivity into double-counting their
-		 * selectivity.)
-		 */
-		pathnode->rows = rel->tuples *
-			restrictlist_selectivity(root,
-									 set_union(rel->baserestrictinfo,
-											   clausegroup),
-									 lfirsti(rel->relids));
-		/* Like costsize.c, force estimate to be at least one row */
-		if (pathnode->rows < 1.0)
-			pathnode->rows = 1.0;
-
-		cost_index(&pathnode->path, root, rel, index, indexquals, true);
-
-		path_list = lappend(path_list, pathnode);
-		outerrelids_list = lnext(outerrelids_list);
-	}
-	return path_list;
-}
-
-/****************************************************************************
- *				----  ROUTINES TO CHECK OPERANDS  ----
- ****************************************************************************/
-
-/*
- * match_index_to_operand()
- *	  Generalized test for a match between an index's key
- *	  and the operand on one side of a restriction or join clause.
- *	  Now check for functional indices as well.
- */
-static bool
-match_index_to_operand(int indexkey,
-					   Var *operand,
-					   RelOptInfo *rel,
-					   IndexOptInfo *index)
-{
-	/*
-	 * Ignore any RelabelType node above the indexkey.	This is needed to
-	 * be able to apply indexscanning in binary-compatible-operator cases.
-	 * Note: we can assume there is at most one RelabelType node;
-	 * eval_const_expressions() will have simplified if more than one.
-	 */
-	if (operand && IsA(operand, RelabelType))
-		operand = (Var *) ((RelabelType *) operand)->arg;
-
-	if (index->indproc == InvalidOid)
-	{
-		/*
-		 * Simple index.
-		 */
-		if (operand && IsA(operand, Var) &&
-			lfirsti(rel->relids) == operand->varno &&
-			indexkey == operand->varattno)
-			return true;
-		else
-			return false;
-	}
-
-	/*
-	 * Functional index.
-	 */
-	return function_index_operand((Expr *) operand, rel, index);
-}
-
-static bool
-function_index_operand(Expr *funcOpnd, RelOptInfo *rel, IndexOptInfo *index)
-{
-	int			relvarno = lfirsti(rel->relids);
-	Func	   *function;
-	List	   *funcargs;
-	int		   *indexKeys = index->indexkeys;
-	List	   *arg;
-	int			i;
-
-	/*
-	 * sanity check, make sure we know what we're dealing with here.
-	 */
-	if (funcOpnd == NULL || !IsA(funcOpnd, Expr) ||
-		funcOpnd->opType != FUNC_EXPR ||
-		funcOpnd->oper == NULL || indexKeys == NULL)
-		return false;
-
-	function = (Func *) funcOpnd->oper;
-	funcargs = funcOpnd->args;
-
-	if (function->funcid != index->indproc)
-		return false;
-
-	/*----------
-	 * Check that the arguments correspond to the same arguments used to
-	 * create the functional index.  To do this we must check that
-	 *	1. they refer to the right relation.
-	 *	2. the args have the right attr. numbers in the right order.
-	 * We must ignore RelabelType nodes above the argument Vars in order
-	 * to recognize binary-compatible-function cases correctly.
-	 *----------
-	 */
-	i = 0;
-	foreach(arg, funcargs)
-	{
-		Var		   *var = (Var *) lfirst(arg);
-
-		if (var && IsA(var, RelabelType))
-			var = (Var *) ((RelabelType *) var)->arg;
-		if (var == NULL || !IsA(var, Var))
-			return false;
-		if (indexKeys[i] == 0)
-			return false;
-		if (var->varno != relvarno || var->varattno != indexKeys[i])
-			return false;
-
-		i++;
-	}
-
-	if (indexKeys[i] != 0)
-		return false;			/* not enough arguments */
-
-	return true;
-}
-
-/****************************************************************************
- *			----  ROUTINES FOR "SPECIAL" INDEXABLE OPERATORS  ----
- ****************************************************************************/
-
-/*----------
- * These routines handle special optimization of operators that can be
- * used with index scans even though they are not known to the executor's
- * indexscan machinery.  The key idea is that these operators allow us
- * to derive approximate indexscan qual clauses, such that any tuples
- * that pass the operator clause itself must also satisfy the simpler
- * indexscan condition(s).	Then we can use the indexscan machinery
- * to avoid scanning as much of the table as we'd otherwise have to,
- * while applying the original operator as a qpqual condition to ensure
- * we deliver only the tuples we want.	(In essence, we're using a regular
- * index as if it were a lossy index.)
- *
- * An example of what we're doing is
- *			textfield LIKE 'abc%'
- * from which we can generate the indexscanable conditions
- *			textfield >= 'abc' AND textfield < 'abd'
- * which allow efficient scanning of an index on textfield.
- * (In reality, character set and collation issues make the transformation
- * from LIKE to indexscan limits rather harder than one might think ...
- * but that's the basic idea.)
- *
- * Two routines are provided here, match_special_index_operator() and
- * expand_indexqual_conditions().  match_special_index_operator() is
- * just an auxiliary function for match_clause_to_indexkey(); after
- * the latter fails to recognize a restriction opclause's operator
- * as a member of an index's opclass, it asks match_special_index_operator()
- * whether the clause should be considered an indexqual anyway.
- * expand_indexqual_conditions() converts a list of "raw" indexqual
- * conditions (with implicit AND semantics across list elements) into
- * a list that the executor can actually handle.  For operators that
- * are members of the index's opclass this transformation is a no-op,
- * but operators recognized by match_special_index_operator() must be
- * converted into one or more "regular" indexqual conditions.
- *----------
- */
-
-/*
- * match_special_index_operator
- *	  Recognize restriction clauses that can be used to generate
- *	  additional indexscanable qualifications.
- *
- * The given clause is already known to be a binary opclause having
- * the form (indexkey OP pseudoconst) or (pseudoconst OP indexkey),
- * but the OP proved not to be one of the index's opclass operators.
- * Return 'true' if we can do something with it anyway.
- */
-static bool
-match_special_index_operator(Expr *clause, Oid opclass,
-							 bool indexkey_on_left)
-{
-	bool		isIndexable = false;
-	Var		   *leftop,
-			   *rightop;
-	Oid			expr_op;
-	Datum		constvalue;
-	char	   *patt;
-	char	   *prefix;
-	char	   *rest;
-
-	/*
-	 * Currently, all known special operators require the indexkey on the
-	 * left, but this test could be pushed into the switch statement if
-	 * some are added that do not...
-	 */
-	if (!indexkey_on_left)
-		return false;
-
-	/* we know these will succeed */
-	leftop = get_leftop(clause);
-	rightop = get_rightop(clause);
-	expr_op = ((Oper *) clause->oper)->opno;
-
-	/* again, required for all current special ops: */
-	if (!IsA(rightop, Const) ||
-		((Const *) rightop)->constisnull)
-		return false;
-	constvalue = ((Const *) rightop)->constvalue;
-
-	switch (expr_op)
-	{
-		case OID_TEXT_LIKE_OP:
-		case OID_BPCHAR_LIKE_OP:
-		case OID_VARCHAR_LIKE_OP:
-		case OID_NAME_LIKE_OP:
-			if (locale_is_like_safe())
-			{
-				/* the right-hand const is type text for all of these */
-				patt = DatumGetCString(DirectFunctionCall1(textout,
-														   constvalue));
-				isIndexable = pattern_fixed_prefix(patt, Pattern_Type_Like,
-								  &prefix, &rest) != Pattern_Prefix_None;
-				if (prefix)
-					pfree(prefix);
-				pfree(patt);
-			}
-			break;
-
-		case OID_TEXT_ICLIKE_OP:
-		case OID_BPCHAR_ICLIKE_OP:
-		case OID_VARCHAR_ICLIKE_OP:
-		case OID_NAME_ICLIKE_OP:
-			if (locale_is_like_safe())
-			{
-				/* the right-hand const is type text for all of these */
-				patt = DatumGetCString(DirectFunctionCall1(textout,
-														   constvalue));
-				isIndexable = pattern_fixed_prefix(patt, Pattern_Type_Like_IC,
-								  &prefix, &rest) != Pattern_Prefix_None;
-				if (prefix)
-					pfree(prefix);
-				pfree(patt);
-			}
-			break;
-
-		case OID_TEXT_REGEXEQ_OP:
-		case OID_BPCHAR_REGEXEQ_OP:
-		case OID_VARCHAR_REGEXEQ_OP:
-		case OID_NAME_REGEXEQ_OP:
-			if (locale_is_like_safe())
-			{
-				/* the right-hand const is type text for all of these */
-				patt = DatumGetCString(DirectFunctionCall1(textout,
-														   constvalue));
-				isIndexable = pattern_fixed_prefix(patt, Pattern_Type_Regex,
-								  &prefix, &rest) != Pattern_Prefix_None;
-				if (prefix)
-					pfree(prefix);
-				pfree(patt);
-			}
-			break;
-
-		case OID_TEXT_ICREGEXEQ_OP:
-		case OID_BPCHAR_ICREGEXEQ_OP:
-		case OID_VARCHAR_ICREGEXEQ_OP:
-		case OID_NAME_ICREGEXEQ_OP:
-			if (locale_is_like_safe())
-			{
-				/* the right-hand const is type text for all of these */
-				patt = DatumGetCString(DirectFunctionCall1(textout,
-														   constvalue));
-				isIndexable = pattern_fixed_prefix(patt, Pattern_Type_Regex_IC,
-								  &prefix, &rest) != Pattern_Prefix_None;
-				if (prefix)
-					pfree(prefix);
-				pfree(patt);
-			}
-			break;
-
-		case OID_INET_SUB_OP:
-		case OID_INET_SUBEQ_OP:
-		case OID_CIDR_SUB_OP:
-		case OID_CIDR_SUBEQ_OP:
-			isIndexable = true;
-			break;
-	}
-
-	/* done if the expression doesn't look indexable */
-	if (!isIndexable)
-		return false;
-
-	/*
-	 * Must also check that index's opclass supports the operators we will
-	 * want to apply.  (A hash index, for example, will not support ">=".)
-	 * We cheat a little by not checking for availability of "=" ... any
-	 * index type should support "=", methinks.
-	 */
-	switch (expr_op)
-	{
-		case OID_TEXT_LIKE_OP:
-		case OID_TEXT_ICLIKE_OP:
-		case OID_TEXT_REGEXEQ_OP:
-		case OID_TEXT_ICREGEXEQ_OP:
-			if (!op_in_opclass(find_operator(">=", TEXTOID), opclass) ||
-				!op_in_opclass(find_operator("<", TEXTOID), opclass))
-				isIndexable = false;
-			break;
-
-		case OID_BPCHAR_LIKE_OP:
-		case OID_BPCHAR_ICLIKE_OP:
-		case OID_BPCHAR_REGEXEQ_OP:
-		case OID_BPCHAR_ICREGEXEQ_OP:
-			if (!op_in_opclass(find_operator(">=", BPCHAROID), opclass) ||
-				!op_in_opclass(find_operator("<", BPCHAROID), opclass))
-				isIndexable = false;
-			break;
-
-		case OID_VARCHAR_LIKE_OP:
-		case OID_VARCHAR_ICLIKE_OP:
-		case OID_VARCHAR_REGEXEQ_OP:
-		case OID_VARCHAR_ICREGEXEQ_OP:
-			if (!op_in_opclass(find_operator(">=", VARCHAROID), opclass) ||
-				!op_in_opclass(find_operator("<", VARCHAROID), opclass))
-				isIndexable = false;
-			break;
-
-		case OID_NAME_LIKE_OP:
-		case OID_NAME_ICLIKE_OP:
-		case OID_NAME_REGEXEQ_OP:
-		case OID_NAME_ICREGEXEQ_OP:
-			if (!op_in_opclass(find_operator(">=", NAMEOID), opclass) ||
-				!op_in_opclass(find_operator("<", NAMEOID), opclass))
-				isIndexable = false;
-			break;
-
-		case OID_INET_SUB_OP:
-		case OID_INET_SUBEQ_OP:
-			/* for SUB we actually need ">" not ">=", but this should do */
-			if (!op_in_opclass(find_operator(">=", INETOID), opclass) ||
-				!op_in_opclass(find_operator("<=", INETOID), opclass))
-				isIndexable = false;
-			break;
-
-		case OID_CIDR_SUB_OP:
-		case OID_CIDR_SUBEQ_OP:
-			/* for SUB we actually need ">" not ">=", but this should do */
-			if (!op_in_opclass(find_operator(">=", CIDROID), opclass) ||
-				!op_in_opclass(find_operator("<=", CIDROID), opclass))
-				isIndexable = false;
-			break;
-	}
-
-	return isIndexable;
-}
-
-/*
- * expand_indexqual_conditions
- *	  Given a list of (implicitly ANDed) indexqual clauses,
- *	  expand any "special" index operators into clauses that the indexscan
- *	  machinery will know what to do with.	Clauses that were not
- *	  recognized by match_special_index_operator() must be passed through
- *	  unchanged.
- */
-List *
-expand_indexqual_conditions(List *indexquals)
-{
-	List	   *resultquals = NIL;
-	List	   *q;
-
-	foreach(q, indexquals)
-	{
-		Expr	   *clause = (Expr *) lfirst(q);
-
-		/* we know these will succeed */
-		Var		   *leftop = get_leftop(clause);
-		Var		   *rightop = get_rightop(clause);
-		Oid			expr_op = ((Oper *) clause->oper)->opno;
-		Datum		constvalue;
-		char	   *patt;
-		char	   *prefix;
-		char	   *rest;
-		Pattern_Prefix_Status pstatus;
-
-		switch (expr_op)
-		{
-				/*
-				 * LIKE and regex operators are not members of any index
-				 * opclass, so if we find one in an indexqual list we can
-				 * assume that it was accepted by
-				 * match_special_index_operator().
-				 */
-			case OID_TEXT_LIKE_OP:
-			case OID_BPCHAR_LIKE_OP:
-			case OID_VARCHAR_LIKE_OP:
-			case OID_NAME_LIKE_OP:
-				/* the right-hand const is type text for all of these */
-				constvalue = ((Const *) rightop)->constvalue;
-				patt = DatumGetCString(DirectFunctionCall1(textout,
-														   constvalue));
-				pstatus = pattern_fixed_prefix(patt, Pattern_Type_Like,
-											   &prefix, &rest);
-				resultquals = nconc(resultquals,
-									prefix_quals(leftop, expr_op,
-												 prefix, pstatus));
-				if (prefix)
-					pfree(prefix);
-				pfree(patt);
-				break;
-
-			case OID_TEXT_ICLIKE_OP:
-			case OID_BPCHAR_ICLIKE_OP:
-			case OID_VARCHAR_ICLIKE_OP:
-			case OID_NAME_ICLIKE_OP:
-				/* the right-hand const is type text for all of these */
-				constvalue = ((Const *) rightop)->constvalue;
-				patt = DatumGetCString(DirectFunctionCall1(textout,
-														   constvalue));
-				pstatus = pattern_fixed_prefix(patt, Pattern_Type_Like_IC,
-											   &prefix, &rest);
-				resultquals = nconc(resultquals,
-									prefix_quals(leftop, expr_op,
-												 prefix, pstatus));
-				if (prefix)
-					pfree(prefix);
-				pfree(patt);
-				break;
-
-			case OID_TEXT_REGEXEQ_OP:
-			case OID_BPCHAR_REGEXEQ_OP:
-			case OID_VARCHAR_REGEXEQ_OP:
-			case OID_NAME_REGEXEQ_OP:
-				/* the right-hand const is type text for all of these */
-				constvalue = ((Const *) rightop)->constvalue;
-				patt = DatumGetCString(DirectFunctionCall1(textout,
-														   constvalue));
-				pstatus = pattern_fixed_prefix(patt, Pattern_Type_Regex,
-											   &prefix, &rest);
-				resultquals = nconc(resultquals,
-									prefix_quals(leftop, expr_op,
-												 prefix, pstatus));
-				if (prefix)
-					pfree(prefix);
-				pfree(patt);
-				break;
-
-			case OID_TEXT_ICREGEXEQ_OP:
-			case OID_BPCHAR_ICREGEXEQ_OP:
-			case OID_VARCHAR_ICREGEXEQ_OP:
-			case OID_NAME_ICREGEXEQ_OP:
-				/* the right-hand const is type text for all of these */
-				constvalue = ((Const *) rightop)->constvalue;
-				patt = DatumGetCString(DirectFunctionCall1(textout,
-														   constvalue));
-				pstatus = pattern_fixed_prefix(patt, Pattern_Type_Regex_IC,
-											   &prefix, &rest);
-				resultquals = nconc(resultquals,
-									prefix_quals(leftop, expr_op,
-												 prefix, pstatus));
-				if (prefix)
-					pfree(prefix);
-				pfree(patt);
-				break;
-
-			case OID_INET_SUB_OP:
-			case OID_INET_SUBEQ_OP:
-			case OID_CIDR_SUB_OP:
-			case OID_CIDR_SUBEQ_OP:
-				constvalue = ((Const *) rightop)->constvalue;
-				resultquals = nconc(resultquals,
-									network_prefix_quals(leftop, expr_op,
-														 constvalue));
-				break;
-
-			default:
-				resultquals = lappend(resultquals, clause);
-				break;
-		}
-	}
-
-	return resultquals;
-}
-
-/*
- * Given a fixed prefix that all the "leftop" values must have,
- * generate suitable indexqual condition(s).  expr_op is the original
- * LIKE or regex operator; we use it to deduce the appropriate comparison
- * operators.
- */
-static List *
-prefix_quals(Var *leftop, Oid expr_op,
-			 char *prefix, Pattern_Prefix_Status pstatus)
-{
-	List	   *result;
-	Oid			datatype;
-	Oid			oproid;
-	Const	   *con;
-	Oper	   *op;
-	Expr	   *expr;
-	char	   *greaterstr;
-
-	Assert(pstatus != Pattern_Prefix_None);
-
-	switch (expr_op)
-	{
-		case OID_TEXT_LIKE_OP:
-		case OID_TEXT_ICLIKE_OP:
-		case OID_TEXT_REGEXEQ_OP:
-		case OID_TEXT_ICREGEXEQ_OP:
-			datatype = TEXTOID;
-			break;
-
-		case OID_BPCHAR_LIKE_OP:
-		case OID_BPCHAR_ICLIKE_OP:
-		case OID_BPCHAR_REGEXEQ_OP:
-		case OID_BPCHAR_ICREGEXEQ_OP:
-			datatype = BPCHAROID;
-			break;
-
-		case OID_VARCHAR_LIKE_OP:
-		case OID_VARCHAR_ICLIKE_OP:
-		case OID_VARCHAR_REGEXEQ_OP:
-		case OID_VARCHAR_ICREGEXEQ_OP:
-			datatype = VARCHAROID;
-			break;
-
-		case OID_NAME_LIKE_OP:
-		case OID_NAME_ICLIKE_OP:
-		case OID_NAME_REGEXEQ_OP:
-		case OID_NAME_ICREGEXEQ_OP:
-			datatype = NAMEOID;
-			break;
-
-		default:
-			elog(ERROR, "prefix_quals: unexpected operator %u", expr_op);
-			return NIL;
-	}
-
-	/*
-	 * If we found an exact-match pattern, generate an "=" indexqual.
-	 */
-	if (pstatus == Pattern_Prefix_Exact)
-	{
-		oproid = find_operator("=", datatype);
-		if (oproid == InvalidOid)
-			elog(ERROR, "prefix_quals: no = operator for type %u", datatype);
-		con = string_to_const(prefix, datatype);
-		op = makeOper(oproid, InvalidOid, BOOLOID, false);
-		expr = make_opclause(op, leftop, (Var *) con);
-		result = makeList1(expr);
-		return result;
-	}
-
-	/*
-	 * Otherwise, we have a nonempty required prefix of the values.
-	 *
-	 * We can always say "x >= prefix".
-	 */
-	oproid = find_operator(">=", datatype);
-	if (oproid == InvalidOid)
-		elog(ERROR, "prefix_quals: no >= operator for type %u", datatype);
-	con = string_to_const(prefix, datatype);
-	op = makeOper(oproid, InvalidOid, BOOLOID, false);
-	expr = make_opclause(op, leftop, (Var *) con);
-	result = makeList1(expr);
-
-	/*-------
-	 * If we can create a string larger than the prefix, we can say
-	 * "x < greaterstr".
-	 *-------
-	 */
-	greaterstr = make_greater_string(prefix, datatype);
-	if (greaterstr)
-	{
-		oproid = find_operator("<", datatype);
-		if (oproid == InvalidOid)
-			elog(ERROR, "prefix_quals: no < operator for type %u", datatype);
-		con = string_to_const(greaterstr, datatype);
-		op = makeOper(oproid, InvalidOid, BOOLOID, false);
-		expr = make_opclause(op, leftop, (Var *) con);
-		result = lappend(result, expr);
-		pfree(greaterstr);
-	}
-
-	return result;
-}
-
-/*
- * Given a leftop and a rightop, and a inet-class sup/sub operator,
- * generate suitable indexqual condition(s).  expr_op is the original
- * operator.
- */
-static List *
-network_prefix_quals(Var *leftop, Oid expr_op, Datum rightop)
-{
-	bool		is_eq;
-	char	   *opr1name;
-	Datum		opr1right;
-	Datum		opr2right;
-	Oid			opr1oid;
-	Oid			opr2oid;
-	List	   *result;
-	Oid			datatype;
-	Oper	   *op;
-	Expr	   *expr;
-
-	switch (expr_op)
-	{
-		case OID_INET_SUB_OP:
-			datatype = INETOID;
-			is_eq = false;
-			break;
-		case OID_INET_SUBEQ_OP:
-			datatype = INETOID;
-			is_eq = true;
-			break;
-		case OID_CIDR_SUB_OP:
-			datatype = CIDROID;
-			is_eq = false;
-			break;
-		case OID_CIDR_SUBEQ_OP:
-			datatype = CIDROID;
-			is_eq = true;
-			break;
-		default:
-			elog(ERROR, "network_prefix_quals: unexpected operator %u",
-				 expr_op);
-			return NIL;
-	}
-
-	/*
-	 * create clause "key >= network_scan_first( rightop )", or ">" if the
-	 * operator disallows equality.
-	 */
-
-	opr1name = is_eq ? ">=" : ">";
-	opr1oid = find_operator(opr1name, datatype);
-	if (opr1oid == InvalidOid)
-		elog(ERROR, "network_prefix_quals: no %s operator for type %u",
-			 opr1name, datatype);
-
-	opr1right = network_scan_first(rightop);
-
-	op = makeOper(opr1oid, InvalidOid, BOOLOID, false);
-	expr = make_opclause(op, leftop,
-						 (Var *) makeConst(datatype, -1, opr1right,
-										   false, false, false, false));
-	result = makeList1(expr);
-
-	/* create clause "key <= network_scan_last( rightop )" */
-
-	opr2oid = find_operator("<=", datatype);
-	if (opr2oid == InvalidOid)
-		elog(ERROR, "network_prefix_quals: no <= operator for type %u",
-			 datatype);
-
-	opr2right = network_scan_last(rightop);
-
-	op = makeOper(opr2oid, InvalidOid, BOOLOID, false);
-	expr = make_opclause(op, leftop,
-						 (Var *) makeConst(datatype, -1, opr2right,
-										   false, false, false, false));
-	result = lappend(result, expr);
-
-	return result;
-}
-
-/*
- * Handy subroutines for match_special_index_operator() and friends.
- */
-
-/* See if there is a binary op of the given name for the given datatype */
-/* NB: we assume that only built-in system operators are searched for */
-static Oid
-find_operator(const char *opname, Oid datatype)
-{
-	return GetSysCacheOid(OPERNAMENSP,
-						  PointerGetDatum(opname),
-						  ObjectIdGetDatum(datatype),
-						  ObjectIdGetDatum(datatype),
-						  ObjectIdGetDatum(PG_CATALOG_NAMESPACE));
-}
-
-/*
- * Generate a Datum of the appropriate type from a C string.
- * Note that all of the supported types are pass-by-ref, so the
- * returned value should be pfree'd if no longer needed.
- */
-static Datum
-string_to_datum(const char *str, Oid datatype)
-{
-	/*
-	 * We cheat a little by assuming that textin() will do for bpchar and
-	 * varchar constants too...
-	 */
-	if (datatype == NAMEOID)
-		return DirectFunctionCall1(namein, CStringGetDatum(str));
-	else
-		return DirectFunctionCall1(textin, CStringGetDatum(str));
-}
-
-/*
- * Generate a Const node of the appropriate type from a C string.
- */
-static Const *
-string_to_const(const char *str, Oid datatype)
-{
-	Datum		conval = string_to_datum(str, datatype);
-
-	return makeConst(datatype, ((datatype == NAMEOID) ? NAMEDATALEN : -1),
-					 conval, false, false, false, false);
-}