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/util/clauses.c b/src/backend/optimizer/util/clauses.c
deleted file mode 100644
index 366a23c5cd0..00000000000
--- a/src/backend/optimizer/util/clauses.c
+++ /dev/null
@@ -1,2324 +0,0 @@
-/*-------------------------------------------------------------------------
- *
- * clauses.c
- *	  routines to manipulate qualification clauses
- *
- * 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/util/clauses.c,v 1.101 2002/06/20 20:29:31 momjian Exp $
- *
- * HISTORY
- *	  AUTHOR			DATE			MAJOR EVENT
- *	  Andrew Yu			Nov 3, 1994		clause.c and clauses.c combined
- *
- *-------------------------------------------------------------------------
- */
-
-#include "postgres.h"
-
-#include "catalog/pg_operator.h"
-#include "catalog/pg_proc.h"
-#include "catalog/pg_type.h"
-#include "executor/executor.h"
-#include "nodes/makefuncs.h"
-#include "nodes/nodeFuncs.h"
-#include "optimizer/clauses.h"
-#include "optimizer/tlist.h"
-#include "optimizer/var.h"
-#include "parser/parsetree.h"
-#include "utils/datum.h"
-#include "utils/lsyscache.h"
-#include "utils/syscache.h"
-
-
-/* note that pg_type.h hardwires size of bool as 1 ... duplicate it */
-#define MAKEBOOLCONST(val,isnull) \
-	((Node *) makeConst(BOOLOID, 1, (Datum) (val), \
-						(isnull), true, false, false))
-
-typedef struct
-{
-	Query	   *query;
-	List	   *groupClauses;
-}	check_subplans_for_ungrouped_vars_context;
-
-static bool contain_agg_clause_walker(Node *node, void *context);
-static bool pull_agg_clause_walker(Node *node, List **listptr);
-static bool expression_returns_set_walker(Node *node, void *context);
-static bool contain_subplans_walker(Node *node, void *context);
-static bool pull_subplans_walker(Node *node, List **listptr);
-static bool check_subplans_for_ungrouped_vars_walker(Node *node,
-					check_subplans_for_ungrouped_vars_context * context);
-static bool contain_mutable_functions_walker(Node *node, void *context);
-static bool contain_volatile_functions_walker(Node *node, void *context);
-static Node *eval_const_expressions_mutator(Node *node, void *context);
-static Expr *simplify_op_or_func(Expr *expr, List *args);
-
-
-Expr *
-make_clause(int type, Node *oper, List *args)
-{
-	Expr	   *expr = makeNode(Expr);
-
-	switch (type)
-	{
-		case AND_EXPR:
-		case OR_EXPR:
-		case NOT_EXPR:
-			expr->typeOid = BOOLOID;
-			break;
-		case OP_EXPR:
-			expr->typeOid = ((Oper *) oper)->opresulttype;
-			break;
-		case FUNC_EXPR:
-			expr->typeOid = ((Func *) oper)->funcresulttype;
-			break;
-		default:
-			elog(ERROR, "make_clause: unsupported type %d", type);
-			break;
-	}
-	expr->opType = type;
-	expr->oper = oper;			/* ignored for AND, OR, NOT */
-	expr->args = args;
-	return expr;
-}
-
-
-/*****************************************************************************
- *		OPERATOR clause functions
- *****************************************************************************/
-
-
-/*
- * is_opclause
- *
- * Returns t iff the clause is an operator clause:
- *				(op expr expr) or (op expr).
- *
- * [historical note: is_clause has the exact functionality and is used
- *		throughout the code. They're renamed to is_opclause for clarity.
- *												- ay 10/94.]
- */
-bool
-is_opclause(Node *clause)
-{
-	return (clause != NULL &&
-			IsA(clause, Expr) &&
-			((Expr *) clause)->opType == OP_EXPR);
-}
-
-/*
- * make_opclause
- *	  Creates a clause given its operator left operand and right
- *	  operand (if it is non-null).
- *
- */
-Expr *
-make_opclause(Oper *op, Var *leftop, Var *rightop)
-{
-	Expr	   *expr = makeNode(Expr);
-
-	expr->typeOid = op->opresulttype;
-	expr->opType = OP_EXPR;
-	expr->oper = (Node *) op;
-	if (rightop)
-		expr->args = makeList2(leftop, rightop);
-	else
-		expr->args = makeList1(leftop);
-	return expr;
-}
-
-/*
- * get_leftop
- *
- * Returns the left operand of a clause of the form (op expr expr)
- *		or (op expr)
- *
- * NB: for historical reasons, the result is declared Var *, even
- * though many callers can cope with results that are not Vars.
- * The result really ought to be declared Expr * or Node *.
- */
-Var *
-get_leftop(Expr *clause)
-{
-	if (clause->args != NULL)
-		return lfirst(clause->args);
-	else
-		return NULL;
-}
-
-/*
- * get_rightop
- *
- * Returns the right operand in a clause of the form (op expr expr).
- * NB: result will be NULL if applied to a unary op clause.
- */
-Var *
-get_rightop(Expr *clause)
-{
-	if (clause->args != NULL && lnext(clause->args) != NULL)
-		return lfirst(lnext(clause->args));
-	else
-		return NULL;
-}
-
-/*****************************************************************************
- *		FUNC clause functions
- *****************************************************************************/
-
-/*
- * is_funcclause
- *
- * Returns t iff the clause is a function clause: (func { expr }).
- *
- */
-bool
-is_funcclause(Node *clause)
-{
-	return (clause != NULL &&
-			IsA(clause, Expr) &&
-			((Expr *) clause)->opType == FUNC_EXPR);
-}
-
-/*
- * make_funcclause
- *
- * Creates a function clause given the FUNC node and the functional
- * arguments.
- *
- */
-Expr *
-make_funcclause(Func *func, List *funcargs)
-{
-	Expr	   *expr = makeNode(Expr);
-
-	expr->typeOid = func->funcresulttype;
-	expr->opType = FUNC_EXPR;
-	expr->oper = (Node *) func;
-	expr->args = funcargs;
-	return expr;
-}
-
-/*****************************************************************************
- *		OR clause functions
- *****************************************************************************/
-
-/*
- * or_clause
- *
- * Returns t iff the clause is an 'or' clause: (OR { expr }).
- *
- */
-bool
-or_clause(Node *clause)
-{
-	return (clause != NULL &&
-			IsA(clause, Expr) &&
-			((Expr *) clause)->opType == OR_EXPR);
-}
-
-/*
- * make_orclause
- *
- * Creates an 'or' clause given a list of its subclauses.
- *
- */
-Expr *
-make_orclause(List *orclauses)
-{
-	Expr	   *expr = makeNode(Expr);
-
-	expr->typeOid = BOOLOID;
-	expr->opType = OR_EXPR;
-	expr->oper = NULL;
-	expr->args = orclauses;
-	return expr;
-}
-
-/*****************************************************************************
- *		NOT clause functions
- *****************************************************************************/
-
-/*
- * not_clause
- *
- * Returns t iff this is a 'not' clause: (NOT expr).
- *
- */
-bool
-not_clause(Node *clause)
-{
-	return (clause != NULL &&
-			IsA(clause, Expr) &&
-			((Expr *) clause)->opType == NOT_EXPR);
-}
-
-/*
- * make_notclause
- *
- * Create a 'not' clause given the expression to be negated.
- *
- */
-Expr *
-make_notclause(Expr *notclause)
-{
-	Expr	   *expr = makeNode(Expr);
-
-	expr->typeOid = BOOLOID;
-	expr->opType = NOT_EXPR;
-	expr->oper = NULL;
-	expr->args = makeList1(notclause);
-	return expr;
-}
-
-/*
- * get_notclausearg
- *
- * Retrieve the clause within a 'not' clause
- *
- */
-Expr *
-get_notclausearg(Expr *notclause)
-{
-	return lfirst(notclause->args);
-}
-
-/*****************************************************************************
- *		AND clause functions
- *****************************************************************************/
-
-
-/*
- * and_clause
- *
- * Returns t iff its argument is an 'and' clause: (AND { expr }).
- *
- */
-bool
-and_clause(Node *clause)
-{
-	return (clause != NULL &&
-			IsA(clause, Expr) &&
-			((Expr *) clause)->opType == AND_EXPR);
-}
-
-/*
- * make_andclause
- *
- * Create an 'and' clause given its arguments in a list.
- */
-Expr *
-make_andclause(List *andclauses)
-{
-	Expr	   *expr = makeNode(Expr);
-
-	expr->typeOid = BOOLOID;
-	expr->opType = AND_EXPR;
-	expr->oper = NULL;
-	expr->args = andclauses;
-	return expr;
-}
-
-/*
- * make_and_qual
- *
- * Variant of make_andclause for ANDing two qual conditions together.
- * Qual conditions have the property that a NULL nodetree is interpreted
- * as 'true'.
- */
-Node *
-make_and_qual(Node *qual1, Node *qual2)
-{
-	if (qual1 == NULL)
-		return qual2;
-	if (qual2 == NULL)
-		return qual1;
-	return (Node *) make_andclause(makeList2(qual1, qual2));
-}
-
-/*
- * Sometimes (such as in the result of canonicalize_qual or the input of
- * ExecQual), we use lists of expression nodes with implicit AND semantics.
- *
- * These functions convert between an AND-semantics expression list and the
- * ordinary representation of a boolean expression.
- *
- * Note that an empty list is considered equivalent to TRUE.
- */
-Expr *
-make_ands_explicit(List *andclauses)
-{
-	if (andclauses == NIL)
-		return (Expr *) MAKEBOOLCONST(true, false);
-	else if (lnext(andclauses) == NIL)
-		return (Expr *) lfirst(andclauses);
-	else
-		return make_andclause(andclauses);
-}
-
-List *
-make_ands_implicit(Expr *clause)
-{
-	/*
-	 * NB: because the parser sets the qual field to NULL in a query that
-	 * has no WHERE clause, we must consider a NULL input clause as TRUE,
-	 * even though one might more reasonably think it FALSE.  Grumble. If
-	 * this causes trouble, consider changing the parser's behavior.
-	 */
-	if (clause == NULL)
-		return NIL;				/* NULL -> NIL list == TRUE */
-	else if (and_clause((Node *) clause))
-		return clause->args;
-	else if (IsA(clause, Const) &&
-			 !((Const *) clause)->constisnull &&
-			 DatumGetBool(((Const *) clause)->constvalue))
-		return NIL;				/* constant TRUE input -> NIL list */
-	else
-		return makeList1(clause);
-}
-
-
-/*****************************************************************************
- *		Aggregate-function clause manipulation
- *****************************************************************************/
-
-/*
- * contain_agg_clause
- *	  Recursively search for Aggref nodes within a clause.
- *
- *	  Returns true if any aggregate found.
- */
-bool
-contain_agg_clause(Node *clause)
-{
-	return contain_agg_clause_walker(clause, NULL);
-}
-
-static bool
-contain_agg_clause_walker(Node *node, void *context)
-{
-	if (node == NULL)
-		return false;
-	if (IsA(node, Aggref))
-		return true;			/* abort the tree traversal and return
-								 * true */
-	return expression_tree_walker(node, contain_agg_clause_walker, context);
-}
-
-/*
- * pull_agg_clause
- *	  Recursively pulls all Aggref nodes from an expression tree.
- *
- *	  Returns list of Aggref nodes found.  Note the nodes themselves are not
- *	  copied, only referenced.
- *
- *	  Note: this also checks for nested aggregates, which are an error.
- */
-List *
-pull_agg_clause(Node *clause)
-{
-	List	   *result = NIL;
-
-	pull_agg_clause_walker(clause, &result);
-	return result;
-}
-
-static bool
-pull_agg_clause_walker(Node *node, List **listptr)
-{
-	if (node == NULL)
-		return false;
-	if (IsA(node, Aggref))
-	{
-		*listptr = lappend(*listptr, node);
-
-		/*
-		 * Complain if the aggregate's argument contains any aggregates;
-		 * nested agg functions are semantically nonsensical.
-		 */
-		if (contain_agg_clause(((Aggref *) node)->target))
-			elog(ERROR, "Aggregate function calls may not be nested");
-
-		/*
-		 * Having checked that, we need not recurse into the argument.
-		 */
-		return false;
-	}
-	return expression_tree_walker(node, pull_agg_clause_walker,
-								  (void *) listptr);
-}
-
-
-/*****************************************************************************
- *		Support for expressions returning sets
- *****************************************************************************/
-
-/*
- * expression_returns_set
- *	  Test whethe an expression returns a set result.
- *
- * Because we use expression_tree_walker(), this can also be applied to
- * whole targetlists; it'll produce TRUE if any one of the tlist items
- * returns a set.
- */
-bool
-expression_returns_set(Node *clause)
-{
-	return expression_returns_set_walker(clause, NULL);
-}
-
-static bool
-expression_returns_set_walker(Node *node, void *context)
-{
-	if (node == NULL)
-		return false;
-	if (IsA(node, Expr))
-	{
-		Expr   *expr = (Expr *) node;
-
-		switch (expr->opType)
-		{
-			case OP_EXPR:
-				if (((Oper *) expr->oper)->opretset)
-					return true;
-				/* else fall through to check args */
-				break;
-			case FUNC_EXPR:
-				if (((Func *) expr->oper)->funcretset)
-					return true;
-				/* else fall through to check args */
-				break;
-			case OR_EXPR:
-			case AND_EXPR:
-			case NOT_EXPR:
-				/* Booleans can't return a set, so no need to recurse */
-				return false;
-			case SUBPLAN_EXPR:
-				/* Subplans can't presently return sets either */
-				return false;
-		}
-	}
-	/* Avoid recursion for some other cases that can't return a set */
-	if (IsA(node, Aggref))
-		return false;
-	if (IsA(node, SubLink))
-		return false;
-	return expression_tree_walker(node, expression_returns_set_walker,
-								  context);
-}
-
-/*****************************************************************************
- *		Subplan clause manipulation
- *****************************************************************************/
-
-/*
- * contain_subplans
- *	  Recursively search for subplan nodes within a clause.
- *
- * If we see a SubLink node, we will return TRUE.  This is only possible if
- * the expression tree hasn't yet been transformed by subselect.c.  We do not
- * know whether the node will produce a true subplan or just an initplan,
- * but we make the conservative assumption that it will be a subplan.
- *
- * Returns true if any subplan found.
- */
-bool
-contain_subplans(Node *clause)
-{
-	return contain_subplans_walker(clause, NULL);
-}
-
-static bool
-contain_subplans_walker(Node *node, void *context)
-{
-	if (node == NULL)
-		return false;
-	if (is_subplan(node) || IsA(node, SubLink))
-		return true;			/* abort the tree traversal and return
-								 * true */
-	return expression_tree_walker(node, contain_subplans_walker, context);
-}
-
-/*
- * pull_subplans
- *	  Recursively pulls all subplans from an expression tree.
- *
- *	  Returns list of subplan nodes found.	Note the nodes themselves are not
- *	  copied, only referenced.
- */
-List *
-pull_subplans(Node *clause)
-{
-	List	   *result = NIL;
-
-	pull_subplans_walker(clause, &result);
-	return result;
-}
-
-static bool
-pull_subplans_walker(Node *node, List **listptr)
-{
-	if (node == NULL)
-		return false;
-	if (is_subplan(node))
-	{
-		*listptr = lappend(*listptr, ((Expr *) node)->oper);
-		/* fall through to check args to subplan */
-	}
-	return expression_tree_walker(node, pull_subplans_walker,
-								  (void *) listptr);
-}
-
-/*
- * check_subplans_for_ungrouped_vars
- *		Check for subplans that are being passed ungrouped variables as
- *		parameters; generate an error message if any are found.
- *
- * In most contexts, ungrouped variables will be detected by the parser (see
- * parse_agg.c, check_ungrouped_columns()). But that routine currently does
- * not check subplans, because the necessary info is not computed until the
- * planner runs.  So we do it here, after we have processed sublinks into
- * subplans.  This ought to be cleaned up someday.
- *
- * A deficiency in this scheme is that any outer reference var must be
- * grouped by itself; we don't recognize groupable expressions within
- * subselects.	For example, consider
- *		SELECT
- *			(SELECT x FROM bar where y = (foo.a + foo.b))
- *		FROM foo
- *		GROUP BY a + b;
- * This query will be rejected although it could be allowed.
- */
-void
-check_subplans_for_ungrouped_vars(Query *query)
-{
-	check_subplans_for_ungrouped_vars_context context;
-	List	   *gl;
-
-	context.query = query;
-
-	/*
-	 * Build a list of the acceptable GROUP BY expressions for use in the
-	 * walker (to avoid repeated scans of the targetlist within the
-	 * recursive routine).
-	 */
-	context.groupClauses = NIL;
-	foreach(gl, query->groupClause)
-	{
-		GroupClause *grpcl = lfirst(gl);
-		Node	   *expr;
-
-		expr = get_sortgroupclause_expr(grpcl, query->targetList);
-		context.groupClauses = lcons(expr, context.groupClauses);
-	}
-
-	/*
-	 * Recursively scan the targetlist and the HAVING clause. WHERE and
-	 * JOIN/ON conditions are not examined, since they are evaluated
-	 * before grouping.
-	 */
-	check_subplans_for_ungrouped_vars_walker((Node *) query->targetList,
-											 &context);
-	check_subplans_for_ungrouped_vars_walker(query->havingQual,
-											 &context);
-
-	freeList(context.groupClauses);
-}
-
-static bool
-check_subplans_for_ungrouped_vars_walker(Node *node,
-					 check_subplans_for_ungrouped_vars_context * context)
-{
-	List	   *gl;
-
-	if (node == NULL)
-		return false;
-	if (IsA(node, Const) ||IsA(node, Param))
-		return false;			/* constants are always acceptable */
-
-	/*
-	 * If we find an aggregate function, do not recurse into its
-	 * arguments.  Subplans invoked within aggregate calls are allowed to
-	 * receive ungrouped variables.  (This test and the next one should
-	 * match the logic in parse_agg.c's check_ungrouped_columns().)
-	 */
-	if (IsA(node, Aggref))
-		return false;
-
-	/*
-	 * Check to see if subexpression as a whole matches any GROUP BY item.
-	 * We need to do this at every recursion level so that we recognize
-	 * GROUPed-BY expressions before reaching variables within them.
-	 */
-	foreach(gl, context->groupClauses)
-	{
-		if (equal(node, lfirst(gl)))
-			return false;		/* acceptable, do not descend more */
-	}
-
-	/*
-	 * We can ignore Vars other than in subplan args lists, since the
-	 * parser already checked 'em.
-	 */
-	if (is_subplan(node))
-	{
-		/*
-		 * The args list of the subplan node represents attributes from
-		 * outside passed into the sublink.
-		 */
-		List	   *t;
-
-		foreach(t, ((Expr *) node)->args)
-		{
-			Node	   *thisarg = lfirst(t);
-			Var		   *var;
-			bool		contained_in_group_clause;
-
-			/*
-			 * We do not care about args that are not local variables;
-			 * params or outer-level vars are not our responsibility to
-			 * check.  (The outer-level query passing them to us needs to
-			 * worry, instead.)
-			 */
-			if (!IsA(thisarg, Var))
-				continue;
-			var = (Var *) thisarg;
-			if (var->varlevelsup > 0)
-				continue;
-
-			/*
-			 * Else, see if it is a grouping column.
-			 */
-			contained_in_group_clause = false;
-			foreach(gl, context->groupClauses)
-			{
-				if (equal(thisarg, lfirst(gl)))
-				{
-					contained_in_group_clause = true;
-					break;
-				}
-			}
-
-			if (!contained_in_group_clause)
-			{
-				/* Found an ungrouped argument.  Complain. */
-				RangeTblEntry *rte;
-				char	   *attname;
-
-				Assert(var->varno > 0 &&
-					 (int) var->varno <= length(context->query->rtable));
-				rte = rt_fetch(var->varno, context->query->rtable);
-				attname = get_rte_attribute_name(rte, var->varattno);
-				elog(ERROR, "Sub-SELECT uses un-GROUPed attribute %s.%s from outer query",
-					 rte->eref->aliasname, attname);
-			}
-		}
-	}
-	return expression_tree_walker(node,
-								check_subplans_for_ungrouped_vars_walker,
-								  (void *) context);
-}
-
-
-/*****************************************************************************
- *		Check clauses for mutable functions
- *****************************************************************************/
-
-/*
- * contain_mutable_functions
- *	  Recursively search for mutable functions within a clause.
- *
- * Returns true if any mutable function (or operator implemented by a
- * mutable function) is found.	This test is needed so that we don't
- * mistakenly think that something like "WHERE random() < 0.5" can be treated
- * as a constant qualification.
- *
- * XXX we do not examine sublinks/subplans to see if they contain uses of
- * mutable functions.  It's not real clear if that is correct or not...
- */
-bool
-contain_mutable_functions(Node *clause)
-{
-	return contain_mutable_functions_walker(clause, NULL);
-}
-
-static bool
-contain_mutable_functions_walker(Node *node, void *context)
-{
-	if (node == NULL)
-		return false;
-	if (IsA(node, Expr))
-	{
-		Expr	   *expr = (Expr *) node;
-
-		switch (expr->opType)
-		{
-			case OP_EXPR:
-				if (op_volatile(((Oper *) expr->oper)->opno) != PROVOLATILE_IMMUTABLE)
-					return true;
-				break;
-			case FUNC_EXPR:
-				if (func_volatile(((Func *) expr->oper)->funcid) != PROVOLATILE_IMMUTABLE)
-					return true;
-				break;
-			default:
-				break;
-		}
-	}
-	return expression_tree_walker(node, contain_mutable_functions_walker,
-								  context);
-}
-
-
-/*****************************************************************************
- *		Check clauses for volatile functions
- *****************************************************************************/
-
-/*
- * contain_volatile_functions
- *	  Recursively search for volatile functions within a clause.
- *
- * Returns true if any volatile function (or operator implemented by a
- * volatile function) is found.	This test prevents invalid conversions
- * of volatile expressions into indexscan quals.
- *
- * XXX we do not examine sublinks/subplans to see if they contain uses of
- * volatile functions.  It's not real clear if that is correct or not...
- */
-bool
-contain_volatile_functions(Node *clause)
-{
-	return contain_volatile_functions_walker(clause, NULL);
-}
-
-static bool
-contain_volatile_functions_walker(Node *node, void *context)
-{
-	if (node == NULL)
-		return false;
-	if (IsA(node, Expr))
-	{
-		Expr	   *expr = (Expr *) node;
-
-		switch (expr->opType)
-		{
-			case OP_EXPR:
-				if (op_volatile(((Oper *) expr->oper)->opno) == PROVOLATILE_VOLATILE)
-					return true;
-				break;
-			case FUNC_EXPR:
-				if (func_volatile(((Func *) expr->oper)->funcid) == PROVOLATILE_VOLATILE)
-					return true;
-				break;
-			default:
-				break;
-		}
-	}
-	return expression_tree_walker(node, contain_volatile_functions_walker,
-								  context);
-}
-
-
-/*****************************************************************************
- *		Check for "pseudo-constant" clauses
- *****************************************************************************/
-
-/*
- * is_pseudo_constant_clause
- *	  Detect whether a clause is "constant", ie, it contains no variables
- *	  of the current query level and no uses of volatile functions.
- *	  Such a clause is not necessarily a true constant: it can still contain
- *	  Params and outer-level Vars, not to mention functions whose results
- *	  may vary from one statement to the next.  However, the clause's value
- *	  will be constant over any one scan of the current query, so it can be
- *	  used as an indexscan key or (if a top-level qual) can be pushed up to
- *	  become a gating qual.
- */
-bool
-is_pseudo_constant_clause(Node *clause)
-{
-	/*
-	 * We could implement this check in one recursive scan.  But since the
-	 * check for volatile functions is both moderately expensive and
-	 * unlikely to fail, it seems better to look for Vars first and only
-	 * check for volatile functions if we find no Vars.
-	 */
-	if (!contain_var_clause(clause) &&
-		!contain_volatile_functions(clause))
-		return true;
-	return false;
-}
-
-/*
- * pull_constant_clauses
- *		Scan through a list of qualifications and separate "constant" quals
- *		from those that are not.
- *
- * Returns a list of the pseudo-constant clauses in constantQual and the
- * remaining quals as the return value.
- */
-List *
-pull_constant_clauses(List *quals, List **constantQual)
-{
-	List	   *constqual = NIL;
-	List	   *restqual = NIL;
-	List	   *q;
-
-	foreach(q, quals)
-	{
-		Node	   *qual = (Node *) lfirst(q);
-
-		if (is_pseudo_constant_clause(qual))
-			constqual = lappend(constqual, qual);
-		else
-			restqual = lappend(restqual, qual);
-	}
-	*constantQual = constqual;
-	return restqual;
-}
-
-
-/*****************************************************************************
- *		Tests on clauses of queries
- *
- * Possibly this code should go someplace else, since this isn't quite the
- * same meaning of "clause" as is used elsewhere in this module.  But I can't
- * think of a better place for it...
- *****************************************************************************/
-
-/*
- * Test whether a sort/group reference value appears in the given list of
- * SortClause (or GroupClause) nodes.
- *
- * Because GroupClause is typedef'd as SortClause, either kind of
- * node list can be passed without casting.
- */
-static bool
-sortgroupref_is_present(Index sortgroupref, List *clauselist)
-{
-	List	   *clause;
-
-	foreach(clause, clauselist)
-	{
-		SortClause *scl = (SortClause *) lfirst(clause);
-
-		if (scl->tleSortGroupRef == sortgroupref)
-			return true;
-	}
-	return false;
-}
-
-/*
- * Test whether a query uses DISTINCT ON, ie, has a distinct-list that is
- * not the same as the set of output columns.
- */
-bool
-has_distinct_on_clause(Query *query)
-{
-	List	   *targetList;
-
-	/* Is there a DISTINCT clause at all? */
-	if (query->distinctClause == NIL)
-		return false;
-
-	/*
-	 * If the DISTINCT list contains all the nonjunk targetlist items, and
-	 * nothing else (ie, no junk tlist items), then it's a simple
-	 * DISTINCT, else it's DISTINCT ON.  We do not require the lists to be
-	 * in the same order (since the parser may have adjusted the DISTINCT
-	 * clause ordering to agree with ORDER BY).  Furthermore, a
-	 * non-DISTINCT junk tlist item that is in the sortClause is also
-	 * evidence of DISTINCT ON, since we don't allow ORDER BY on junk
-	 * tlist items when plain DISTINCT is used.
-	 *
-	 * This code assumes that the DISTINCT list is valid, ie, all its entries
-	 * match some entry of the tlist.
-	 */
-	foreach(targetList, query->targetList)
-	{
-		TargetEntry *tle = (TargetEntry *) lfirst(targetList);
-		Index		ressortgroupref = tle->resdom->ressortgroupref;
-
-		if (ressortgroupref == 0)
-		{
-			if (tle->resdom->resjunk)
-				continue;		/* we can ignore unsorted junk cols */
-			return true;		/* definitely not in DISTINCT list */
-		}
-		if (sortgroupref_is_present(ressortgroupref, query->distinctClause))
-		{
-			if (tle->resdom->resjunk)
-				return true;	/* junk TLE in DISTINCT means DISTINCT ON */
-			/* else this TLE is okay, keep looking */
-		}
-		else
-		{
-			/* This TLE is not in DISTINCT list */
-			if (!tle->resdom->resjunk)
-				return true;	/* non-junk, non-DISTINCT, so DISTINCT ON */
-			if (sortgroupref_is_present(ressortgroupref, query->sortClause))
-				return true;	/* sorted, non-distinct junk */
-			/* unsorted junk is okay, keep looking */
-		}
-	}
-	/* It's a simple DISTINCT */
-	return false;
-}
-
-
-/*****************************************************************************
- *																			 *
- *		General clause-manipulating routines								 *
- *																			 *
- *****************************************************************************/
-
-/*
- * clause_get_relids_vars
- *	  Retrieves distinct relids and vars appearing within a clause.
- *
- * '*relids' is set to an integer list of all distinct "varno"s appearing
- *		in Vars within the clause.
- * '*vars' is set to a list of all distinct Vars appearing within the clause.
- *		Var nodes are considered distinct if they have different varno
- *		or varattno values.  If there are several occurrences of the same
- *		varno/varattno, you get a randomly chosen one...
- *
- * Note that upper-level vars are ignored, since they normally will
- * become Params with respect to this query level.
- */
-void
-clause_get_relids_vars(Node *clause, Relids *relids, List **vars)
-{
-	List	   *clvars = pull_var_clause(clause, false);
-	List	   *varno_list = NIL;
-	List	   *var_list = NIL;
-	List	   *i;
-
-	foreach(i, clvars)
-	{
-		Var		   *var = (Var *) lfirst(i);
-		List	   *vi;
-
-		if (!intMember(var->varno, varno_list))
-			varno_list = lconsi(var->varno, varno_list);
-		foreach(vi, var_list)
-		{
-			Var		   *in_list = (Var *) lfirst(vi);
-
-			if (in_list->varno == var->varno &&
-				in_list->varattno == var->varattno)
-				break;
-		}
-		if (vi == NIL)
-			var_list = lcons(var, var_list);
-	}
-	freeList(clvars);
-
-	*relids = varno_list;
-	*vars = var_list;
-}
-
-/*
- * NumRelids
- *		(formerly clause_relids)
- *
- * Returns the number of different relations referenced in 'clause'.
- */
-int
-NumRelids(Node *clause)
-{
-	List	   *varno_list = pull_varnos(clause);
-	int			result = length(varno_list);
-
-	freeList(varno_list);
-	return result;
-}
-
-/*--------------------
- * CommuteClause: commute a binary operator clause
- *
- * XXX the clause is destructively modified!
- *--------------------
- */
-void
-CommuteClause(Expr *clause)
-{
-	Oid			opoid;
-	HeapTuple	optup;
-	Form_pg_operator commuTup;
-	Oper	   *commu;
-	Node	   *temp;
-
-	if (!is_opclause((Node *) clause) ||
-		length(clause->args) != 2)
-		elog(ERROR, "CommuteClause: applied to non-binary-operator clause");
-
-	opoid = ((Oper *) clause->oper)->opno;
-
-	optup = SearchSysCache(OPEROID,
-						   ObjectIdGetDatum(get_commutator(opoid)),
-						   0, 0, 0);
-	if (!HeapTupleIsValid(optup))
-		elog(ERROR, "CommuteClause: no commutator for operator %u", opoid);
-
-	commuTup = (Form_pg_operator) GETSTRUCT(optup);
-
-	commu = makeOper(optup->t_data->t_oid,
-					 commuTup->oprcode,
-					 commuTup->oprresult,
-					 ((Oper *) clause->oper)->opretset);
-
-	ReleaseSysCache(optup);
-
-	/*
-	 * re-form the clause in-place!
-	 */
-	clause->oper = (Node *) commu;
-	temp = lfirst(clause->args);
-	lfirst(clause->args) = lsecond(clause->args);
-	lsecond(clause->args) = temp;
-}
-
-
-/*--------------------
- * eval_const_expressions
- *
- * Reduce any recognizably constant subexpressions of the given
- * expression tree, for example "2 + 2" => "4".  More interestingly,
- * we can reduce certain boolean expressions even when they contain
- * non-constant subexpressions: "x OR true" => "true" no matter what
- * the subexpression x is.	(XXX We assume that no such subexpression
- * will have important side-effects, which is not necessarily a good
- * assumption in the presence of user-defined functions; do we need a
- * pg_proc flag that prevents discarding the execution of a function?)
- *
- * We do understand that certain functions may deliver non-constant
- * results even with constant inputs, "nextval()" being the classic
- * example.  Functions that are not marked "immutable" in pg_proc
- * will not be pre-evaluated here, although we will reduce their
- * arguments as far as possible.
- *
- * We assume that the tree has already been type-checked and contains
- * only operators and functions that are reasonable to try to execute.
- *
- * This routine should be invoked before converting sublinks to subplans
- * (subselect.c's SS_process_sublinks()).  The converted form contains
- * bogus "Const" nodes that are actually placeholders where the executor
- * will insert values from the inner plan, and obviously we mustn't try
- * to reduce the expression as though these were really constants.
- * As a safeguard, if we happen to find an already-converted SubPlan node,
- * we will return it unchanged rather than recursing into it.
- *--------------------
- */
-Node *
-eval_const_expressions(Node *node)
-{
-	/* no context or special setup needed, so away we go... */
-	return eval_const_expressions_mutator(node, NULL);
-}
-
-static Node *
-eval_const_expressions_mutator(Node *node, void *context)
-{
-	if (node == NULL)
-		return NULL;
-	if (IsA(node, Expr))
-	{
-		Expr	   *expr = (Expr *) node;
-		List	   *args;
-		Const	   *const_input;
-		Expr	   *newexpr;
-
-		/*
-		 * Reduce constants in the Expr's arguments.  We know args is
-		 * either NIL or a List node, so we can call
-		 * expression_tree_mutator directly rather than recursing to self.
-		 */
-		args = (List *) expression_tree_mutator((Node *) expr->args,
-										  eval_const_expressions_mutator,
-												(void *) context);
-
-		switch (expr->opType)
-		{
-			case OP_EXPR:
-			case FUNC_EXPR:
-
-				/*
-				 * Code for op/func case is pretty bulky, so split it out
-				 * as a separate function.
-				 */
-				newexpr = simplify_op_or_func(expr, args);
-				if (newexpr)	/* successfully simplified it */
-					return (Node *) newexpr;
-
-				/*
-				 * else fall out to build new Expr node with simplified
-				 * args
-				 */
-				break;
-			case OR_EXPR:
-				{
-
-					/*----------
-					 * OR arguments are handled as follows:
-					 *	non constant: keep
-					 *	FALSE: drop (does not affect result)
-					 *	TRUE: force result to TRUE
-					 *	NULL: keep only one
-					 * We keep one NULL input because ExecEvalOr returns NULL
-					 * when no input is TRUE and at least one is NULL.
-					 *----------
-					 */
-					List	   *newargs = NIL;
-					List	   *arg;
-					bool		haveNull = false;
-					bool		forceTrue = false;
-
-					foreach(arg, args)
-					{
-						if (!IsA(lfirst(arg), Const))
-						{
-							newargs = lappend(newargs, lfirst(arg));
-							continue;
-						}
-						const_input = (Const *) lfirst(arg);
-						if (const_input->constisnull)
-							haveNull = true;
-						else if (DatumGetBool(const_input->constvalue))
-							forceTrue = true;
-						/* otherwise, we can drop the constant-false input */
-					}
-
-					/*
-					 * We could return TRUE before falling out of the
-					 * loop, but this coding method will be easier to
-					 * adapt if we ever add a notion of non-removable
-					 * functions. We'd need to check all the inputs for
-					 * non-removability.
-					 */
-					if (forceTrue)
-						return MAKEBOOLCONST(true, false);
-					if (haveNull)
-						newargs = lappend(newargs, MAKEBOOLCONST(false, true));
-					/* If all the inputs are FALSE, result is FALSE */
-					if (newargs == NIL)
-						return MAKEBOOLCONST(false, false);
-					/* If only one nonconst-or-NULL input, it's the result */
-					if (lnext(newargs) == NIL)
-						return (Node *) lfirst(newargs);
-					/* Else we still need an OR node */
-					return (Node *) make_orclause(newargs);
-				}
-			case AND_EXPR:
-				{
-
-					/*----------
-					 * AND arguments are handled as follows:
-					 *	non constant: keep
-					 *	TRUE: drop (does not affect result)
-					 *	FALSE: force result to FALSE
-					 *	NULL: keep only one
-					 * We keep one NULL input because ExecEvalAnd returns NULL
-					 * when no input is FALSE and at least one is NULL.
-					 *----------
-					 */
-					List	   *newargs = NIL;
-					List	   *arg;
-					bool		haveNull = false;
-					bool		forceFalse = false;
-
-					foreach(arg, args)
-					{
-						if (!IsA(lfirst(arg), Const))
-						{
-							newargs = lappend(newargs, lfirst(arg));
-							continue;
-						}
-						const_input = (Const *) lfirst(arg);
-						if (const_input->constisnull)
-							haveNull = true;
-						else if (!DatumGetBool(const_input->constvalue))
-							forceFalse = true;
-						/* otherwise, we can drop the constant-true input */
-					}
-
-					/*
-					 * We could return FALSE before falling out of the
-					 * loop, but this coding method will be easier to
-					 * adapt if we ever add a notion of non-removable
-					 * functions. We'd need to check all the inputs for
-					 * non-removability.
-					 */
-					if (forceFalse)
-						return MAKEBOOLCONST(false, false);
-					if (haveNull)
-						newargs = lappend(newargs, MAKEBOOLCONST(false, true));
-					/* If all the inputs are TRUE, result is TRUE */
-					if (newargs == NIL)
-						return MAKEBOOLCONST(true, false);
-					/* If only one nonconst-or-NULL input, it's the result */
-					if (lnext(newargs) == NIL)
-						return (Node *) lfirst(newargs);
-					/* Else we still need an AND node */
-					return (Node *) make_andclause(newargs);
-				}
-			case NOT_EXPR:
-				Assert(length(args) == 1);
-				if (!IsA(lfirst(args), Const))
-					break;
-				const_input = (Const *) lfirst(args);
-				/* NOT NULL => NULL */
-				if (const_input->constisnull)
-					return MAKEBOOLCONST(false, true);
-				/* otherwise pretty easy */
-				return MAKEBOOLCONST(!DatumGetBool(const_input->constvalue),
-									 false);
-			case SUBPLAN_EXPR:
-
-				/*
-				 * Safety measure per notes at head of this routine:
-				 * return a SubPlan unchanged.	Too late to do anything
-				 * with it.  The arglist simplification above was wasted
-				 * work (the list probably only contains Var nodes
-				 * anyway).
-				 */
-				return (Node *) expr;
-			default:
-				elog(ERROR, "eval_const_expressions: unexpected opType %d",
-					 (int) expr->opType);
-				break;
-		}
-
-		/*
-		 * If we break out of the above switch on opType, then the
-		 * expression cannot be simplified any further, so build and
-		 * return a replacement Expr node using the possibly-simplified
-		 * arguments and the original oper node. Can't use make_clause()
-		 * here because we want to be sure the typeOid field is
-		 * preserved...
-		 */
-		newexpr = makeNode(Expr);
-		newexpr->typeOid = expr->typeOid;
-		newexpr->opType = expr->opType;
-		newexpr->oper = expr->oper;
-		newexpr->args = args;
-		return (Node *) newexpr;
-	}
-	if (IsA(node, RelabelType))
-	{
-		/*
-		 * If we can simplify the input to a constant, then we don't need
-		 * the RelabelType node anymore: just change the type field of the
-		 * Const node.	Otherwise, must copy the RelabelType node.
-		 */
-		RelabelType *relabel = (RelabelType *) node;
-		Node	   *arg;
-
-		arg = eval_const_expressions_mutator(relabel->arg, context);
-
-		/*
-		 * If we find stacked RelabelTypes (eg, from foo :: int :: oid) we
-		 * can discard all but the top one.
-		 */
-		while (arg && IsA(arg, RelabelType))
-			arg = ((RelabelType *) arg)->arg;
-
-		if (arg && IsA(arg, Const))
-		{
-			Const	   *con = (Const *) arg;
-
-			con->consttype = relabel->resulttype;
-
-			/*
-			 * relabel's resulttypmod is discarded, which is OK for now;
-			 * if the type actually needs a runtime length coercion then
-			 * there should be a function call to do it just above this
-			 * node.
-			 */
-			return (Node *) con;
-		}
-		else
-		{
-			RelabelType *newrelabel = makeNode(RelabelType);
-
-			newrelabel->arg = arg;
-			newrelabel->resulttype = relabel->resulttype;
-			newrelabel->resulttypmod = relabel->resulttypmod;
-			return (Node *) newrelabel;
-		}
-	}
-	if (IsA(node, CaseExpr))
-	{
-
-		/*----------
-		 * CASE expressions can be simplified if there are constant
-		 * condition clauses:
-		 *		FALSE (or NULL): drop the alternative
-		 *		TRUE: drop all remaining alternatives
-		 * If the first non-FALSE alternative is a constant TRUE, we can
-		 * simplify the entire CASE to that alternative's expression.
-		 * If there are no non-FALSE alternatives, we simplify the entire
-		 * CASE to the default result (ELSE result).
-		 *----------
-		 */
-		CaseExpr   *caseexpr = (CaseExpr *) node;
-		CaseExpr   *newcase;
-		List	   *newargs = NIL;
-		Node	   *defresult;
-		Const	   *const_input;
-		List	   *arg;
-
-		foreach(arg, caseexpr->args)
-		{
-			/* Simplify this alternative's condition and result */
-			CaseWhen   *casewhen = (CaseWhen *)
-			expression_tree_mutator((Node *) lfirst(arg),
-									eval_const_expressions_mutator,
-									(void *) context);
-
-			Assert(IsA(casewhen, CaseWhen));
-			if (casewhen->expr == NULL ||
-				!IsA(casewhen->expr, Const))
-			{
-				newargs = lappend(newargs, casewhen);
-				continue;
-			}
-			const_input = (Const *) casewhen->expr;
-			if (const_input->constisnull ||
-				!DatumGetBool(const_input->constvalue))
-				continue;		/* drop alternative with FALSE condition */
-
-			/*
-			 * Found a TRUE condition.	If it's the first (un-dropped)
-			 * alternative, the CASE reduces to just this alternative.
-			 */
-			if (newargs == NIL)
-				return casewhen->result;
-
-			/*
-			 * Otherwise, add it to the list, and drop all the rest.
-			 */
-			newargs = lappend(newargs, casewhen);
-			break;
-		}
-
-		/* Simplify the default result */
-		defresult = eval_const_expressions_mutator(caseexpr->defresult,
-												   context);
-
-		/*
-		 * If no non-FALSE alternatives, CASE reduces to the default
-		 * result
-		 */
-		if (newargs == NIL)
-			return defresult;
-		/* Otherwise we need a new CASE node */
-		newcase = makeNode(CaseExpr);
-		newcase->casetype = caseexpr->casetype;
-		newcase->arg = NULL;
-		newcase->args = newargs;
-		newcase->defresult = defresult;
-		return (Node *) newcase;
-	}
-
-	/*
-	 * For any node type not handled above, we recurse using
-	 * expression_tree_mutator, which will copy the node unchanged but try
-	 * to simplify its arguments (if any) using this routine. For example:
-	 * we cannot eliminate an ArrayRef node, but we might be able to
-	 * simplify constant expressions in its subscripts.
-	 */
-	return expression_tree_mutator(node, eval_const_expressions_mutator,
-								   (void *) context);
-}
-
-/*
- * Subroutine for eval_const_expressions: try to evaluate an op or func
- *
- * Inputs are the op or func Expr node, and the pre-simplified argument list.
- * Returns a simplified expression if successful, or NULL if cannot
- * simplify the op/func.
- *
- * XXX Possible future improvement: if the func is SQL-language, and its
- * definition is simply "SELECT expression", we could parse and substitute
- * the expression here.  This would avoid much runtime overhead, and perhaps
- * expose opportunities for constant-folding within the expression even if
- * not all the func's input args are constants.  It'd be appropriate to do
- * that here, not in the parser, since we wouldn't want it to happen until
- * after rule substitution/rewriting.
- */
-static Expr *
-simplify_op_or_func(Expr *expr, List *args)
-{
-	List	   *arg;
-	Oid			funcid;
-	Oid			result_typeid;
-	HeapTuple	func_tuple;
-	Form_pg_proc funcform;
-	char		provolatile;
-	bool		proisstrict;
-	bool		proretset;
-	int16		resultTypLen;
-	bool		resultTypByVal;
-	Expr	   *newexpr;
-	ExprContext *econtext;
-	Datum		const_val;
-	bool		has_nonconst_input = false;
-	bool		has_null_input = false;
-	bool		const_is_null;
-
-	/*
-	 * Check for constant inputs and especially constant-NULL inputs.
-	 */
-	foreach(arg, args)
-	{
-		if (IsA(lfirst(arg), Const))
-			has_null_input |= ((Const *) lfirst(arg))->constisnull;
-		else
-			has_nonconst_input = true;
-	}
-
-	/*
-	 * If the function is strict and has a constant-NULL input, it will
-	 * never be called at all, so we can replace the call by a NULL
-	 * constant even if there are other inputs that aren't constant.
-	 * Otherwise, we can only simplify if all inputs are constants. We can
-	 * skip the function lookup if neither case applies.
-	 */
-	if (has_nonconst_input && !has_null_input)
-		return NULL;
-
-	/*
-	 * Get the function procedure's OID and look to see whether it is
-	 * marked immutable.
-	 *
-	 * Note we take the result type from the Oper or Func node, not the
-	 * pg_proc tuple; probably necessary for binary-compatibility cases.
-	 *
-	 */
-	if (expr->opType == OP_EXPR)
-	{
-		Oper	   *oper = (Oper *) expr->oper;
-
-		replace_opid(oper);		/* OK to scribble on input to this extent */
-		funcid = oper->opid;
-		result_typeid = oper->opresulttype;
-	}
-	else
-	{
-		Func	   *func = (Func *) expr->oper;
-
-		funcid = func->funcid;
-		result_typeid = func->funcresulttype;
-	}
-
-	/*
-	 * we could use func_volatile() here, but we need several fields out
-	 * of the func tuple, so might as well just look it up once.
-	 */
-	func_tuple = SearchSysCache(PROCOID,
-								ObjectIdGetDatum(funcid),
-								0, 0, 0);
-	if (!HeapTupleIsValid(func_tuple))
-		elog(ERROR, "Function OID %u does not exist", funcid);
-	funcform = (Form_pg_proc) GETSTRUCT(func_tuple);
-	provolatile = funcform->provolatile;
-	proisstrict = funcform->proisstrict;
-	proretset = funcform->proretset;
-	ReleaseSysCache(func_tuple);
-
-	if (provolatile != PROVOLATILE_IMMUTABLE)
-		return NULL;
-
-	/*
-	 * Also check to make sure it doesn't return a set.
-	 */
-	if (proretset)
-		return NULL;
-
-	/*
-	 * Now that we know if the function is strict, we can finish the
-	 * checks for simplifiable inputs that we started above.
-	 */
-	if (proisstrict && has_null_input)
-	{
-		/*
-		 * It's strict and has NULL input, so must produce NULL output.
-		 * Return a NULL constant of the right type.
-		 */
-		return (Expr *) makeNullConst(result_typeid);
-	}
-
-	/*
-	 * Otherwise, can simplify only if all inputs are constants. (For a
-	 * non-strict function, constant NULL inputs are treated the same as
-	 * constant non-NULL inputs.)
-	 */
-	if (has_nonconst_input)
-		return NULL;
-
-	/*
-	 * OK, looks like we can simplify this operator/function.
-	 *
-	 * We use the executor's routine ExecEvalExpr() to avoid duplication of
-	 * code and ensure we get the same result as the executor would get.
-	 *
-	 * Build a new Expr node containing the already-simplified arguments. The
-	 * only other setup needed here is the replace_opid() that we already
-	 * did for the OP_EXPR case.
-	 */
-	newexpr = makeNode(Expr);
-	newexpr->typeOid = expr->typeOid;
-	newexpr->opType = expr->opType;
-	newexpr->oper = expr->oper;
-	newexpr->args = args;
-
-	/* Get info needed about result datatype */
-	get_typlenbyval(result_typeid, &resultTypLen, &resultTypByVal);
-
-	/*
-	 * It is OK to pass a dummy econtext because none of the
-	 * ExecEvalExpr() code used in this situation will use econtext.  That
-	 * might seem fortuitous, but it's not so unreasonable --- a constant
-	 * expression does not depend on context, by definition, n'est ce pas?
-	 */
-	econtext = MakeExprContext(NULL, CurrentMemoryContext);
-
-	const_val = ExecEvalExprSwitchContext((Node *) newexpr, econtext,
-										  &const_is_null, NULL);
-
-	/* Must copy result out of sub-context used by expression eval */
-	if (!const_is_null)
-		const_val = datumCopy(const_val, resultTypByVal, resultTypLen);
-
-	FreeExprContext(econtext);
-	pfree(newexpr);
-
-	/*
-	 * Make the constant result node.
-	 */
-	return (Expr *) makeConst(result_typeid, resultTypLen,
-							  const_val, const_is_null,
-							  resultTypByVal, false, false);
-}
-
-
-/*
- * Standard expression-tree walking support
- *
- * We used to have near-duplicate code in many different routines that
- * understood how to recurse through an expression node tree.  That was
- * a pain to maintain, and we frequently had bugs due to some particular
- * routine neglecting to support a particular node type.  In most cases,
- * these routines only actually care about certain node types, and don't
- * care about other types except insofar as they have to recurse through
- * non-primitive node types.  Therefore, we now provide generic tree-walking
- * logic to consolidate the redundant "boilerplate" code.  There are
- * two versions: expression_tree_walker() and expression_tree_mutator().
- */
-
-/*--------------------
- * expression_tree_walker() is designed to support routines that traverse
- * a tree in a read-only fashion (although it will also work for routines
- * that modify nodes in-place but never add/delete/replace nodes).
- * A walker routine should look like this:
- *
- * bool my_walker (Node *node, my_struct *context)
- * {
- *		if (node == NULL)
- *			return false;
- *		// check for nodes that special work is required for, eg:
- *		if (IsA(node, Var))
- *		{
- *			... do special actions for Var nodes
- *		}
- *		else if (IsA(node, ...))
- *		{
- *			... do special actions for other node types
- *		}
- *		// for any node type not specially processed, do:
- *		return expression_tree_walker(node, my_walker, (void *) context);
- * }
- *
- * The "context" argument points to a struct that holds whatever context
- * information the walker routine needs --- it can be used to return data
- * gathered by the walker, too.  This argument is not touched by
- * expression_tree_walker, but it is passed down to recursive sub-invocations
- * of my_walker.  The tree walk is started from a setup routine that
- * fills in the appropriate context struct, calls my_walker with the top-level
- * node of the tree, and then examines the results.
- *
- * The walker routine should return "false" to continue the tree walk, or
- * "true" to abort the walk and immediately return "true" to the top-level
- * caller.	This can be used to short-circuit the traversal if the walker
- * has found what it came for.	"false" is returned to the top-level caller
- * iff no invocation of the walker returned "true".
- *
- * The node types handled by expression_tree_walker include all those
- * normally found in target lists and qualifier clauses during the planning
- * stage.  In particular, it handles List nodes since a cnf-ified qual clause
- * will have List structure at the top level, and it handles TargetEntry nodes
- * so that a scan of a target list can be handled without additional code.
- * (But only the "expr" part of a TargetEntry is examined, unless the walker
- * chooses to process TargetEntry nodes specially.)  Also, RangeTblRef,
- * FromExpr, JoinExpr, and SetOperationStmt nodes are handled, so that query
- * jointrees and setOperation trees can be processed without additional code.
- *
- * expression_tree_walker will handle SubLink and SubPlan nodes by recursing
- * normally into the "lefthand" arguments (which belong to the outer plan).
- * It will also call the walker on the sub-Query node; however, when
- * expression_tree_walker itself is called on a Query node, it does nothing
- * and returns "false".  The net effect is that unless the walker does
- * something special at a Query node, sub-selects will not be visited
- * during an expression tree walk.	This is exactly the behavior wanted
- * in many cases --- and for those walkers that do want to recurse into
- * sub-selects, special behavior is typically needed anyway at the entry
- * to a sub-select (such as incrementing a depth counter).	A walker that
- * wants to examine sub-selects should include code along the lines of:
- *
- *		if (IsA(node, Query))
- *		{
- *			adjust context for subquery;
- *			result = query_tree_walker((Query *) node, my_walker, context,
- *									   true); // to visit subquery RTEs too
- *			restore context if needed;
- *			return result;
- *		}
- *
- * query_tree_walker is a convenience routine (see below) that calls the
- * walker on all the expression subtrees of the given Query node.
- *
- * NOTE: currently, because make_subplan() clears the subselect link in
- * a SubLink node, it is not actually possible to recurse into subselects
- * of an already-planned expression tree.  This is OK for current uses,
- * but ought to be cleaned up when we redesign querytree processing.
- *--------------------
- */
-
-bool
-expression_tree_walker(Node *node,
-					   bool (*walker) (),
-					   void *context)
-{
-	List	   *temp;
-
-	/*
-	 * The walker has already visited the current node, and so we need
-	 * only recurse into any sub-nodes it has.
-	 *
-	 * We assume that the walker is not interested in List nodes per se, so
-	 * when we expect a List we just recurse directly to self without
-	 * bothering to call the walker.
-	 */
-	if (node == NULL)
-		return false;
-	switch (nodeTag(node))
-	{
-		case T_Const:
-		case T_Var:
-		case T_Param:
-		case T_RangeTblRef:
-			/* primitive node types with no subnodes */
-			break;
-		case T_Expr:
-			{
-				Expr	   *expr = (Expr *) node;
-
-				if (expr->opType == SUBPLAN_EXPR)
-				{
-					/* recurse to the SubLink node (skipping SubPlan!) */
-					if (walker((Node *) ((SubPlan *) expr->oper)->sublink,
-							   context))
-						return true;
-				}
-				/* for all Expr node types, examine args list */
-				if (expression_tree_walker((Node *) expr->args,
-										   walker, context))
-					return true;
-			}
-			break;
-		case T_Aggref:
-			return walker(((Aggref *) node)->target, context);
-		case T_ArrayRef:
-			{
-				ArrayRef   *aref = (ArrayRef *) node;
-
-				/* recurse directly for upper/lower array index lists */
-				if (expression_tree_walker((Node *) aref->refupperindexpr,
-										   walker, context))
-					return true;
-				if (expression_tree_walker((Node *) aref->reflowerindexpr,
-										   walker, context))
-					return true;
-				/* walker must see the refexpr and refassgnexpr, however */
-				if (walker(aref->refexpr, context))
-					return true;
-				if (walker(aref->refassgnexpr, context))
-					return true;
-			}
-			break;
-		case T_FieldSelect:
-			return walker(((FieldSelect *) node)->arg, context);
-		case T_RelabelType:
-			return walker(((RelabelType *) node)->arg, context);
-		case T_CaseExpr:
-			{
-				CaseExpr   *caseexpr = (CaseExpr *) node;
-
-				/* we assume walker doesn't care about CaseWhens, either */
-				foreach(temp, caseexpr->args)
-				{
-					CaseWhen   *when = (CaseWhen *) lfirst(temp);
-
-					Assert(IsA(when, CaseWhen));
-					if (walker(when->expr, context))
-						return true;
-					if (walker(when->result, context))
-						return true;
-				}
-				/* caseexpr->arg should be null, but we'll check it anyway */
-				if (walker(caseexpr->arg, context))
-					return true;
-				if (walker(caseexpr->defresult, context))
-					return true;
-			}
-			break;
-		case T_NullTest:
-			return walker(((NullTest *) node)->arg, context);
-		case T_BooleanTest:
-			return walker(((BooleanTest *) node)->arg, context);
-		case T_SubLink:
-			{
-				SubLink    *sublink = (SubLink *) node;
-
-				/*
-				 * If the SubLink has already been processed by
-				 * subselect.c, it will have lefthand=NIL, and we need to
-				 * scan the oper list.	Otherwise we only need to look at
-				 * the lefthand list (the incomplete Oper nodes in the
-				 * oper list are deemed uninteresting, perhaps even
-				 * confusing).
-				 */
-				if (sublink->lefthand)
-				{
-					if (walker((Node *) sublink->lefthand, context))
-						return true;
-				}
-				else
-				{
-					if (walker((Node *) sublink->oper, context))
-						return true;
-				}
-
-				/*
-				 * Also invoke the walker on the sublink's Query node, so
-				 * it can recurse into the sub-query if it wants to.
-				 */
-				return walker(sublink->subselect, context);
-			}
-			break;
-		case T_Query:
-			/* Do nothing with a sub-Query, per discussion above */
-			break;
-		case T_List:
-			foreach(temp, (List *) node)
-			{
-				if (walker((Node *) lfirst(temp), context))
-					return true;
-			}
-			break;
-		case T_TargetEntry:
-			return walker(((TargetEntry *) node)->expr, context);
-		case T_FromExpr:
-			{
-				FromExpr   *from = (FromExpr *) node;
-
-				if (walker(from->fromlist, context))
-					return true;
-				if (walker(from->quals, context))
-					return true;
-			}
-			break;
-		case T_JoinExpr:
-			{
-				JoinExpr   *join = (JoinExpr *) node;
-
-				if (walker(join->larg, context))
-					return true;
-				if (walker(join->rarg, context))
-					return true;
-				if (walker(join->quals, context))
-					return true;
-				/*
-				 * alias clause, using list are deemed uninteresting.
-				 */
-			}
-			break;
-		case T_SetOperationStmt:
-			{
-				SetOperationStmt *setop = (SetOperationStmt *) node;
-
-				if (walker(setop->larg, context))
-					return true;
-				if (walker(setop->rarg, context))
-					return true;
-			}
-			break;
-		default:
-			elog(ERROR, "expression_tree_walker: Unexpected node type %d",
-				 nodeTag(node));
-			break;
-	}
-	return false;
-}
-
-/*
- * query_tree_walker --- initiate a walk of a Query's expressions
- *
- * This routine exists just to reduce the number of places that need to know
- * where all the expression subtrees of a Query are.  Note it can be used
- * for starting a walk at top level of a Query regardless of whether the
- * walker intends to descend into subqueries.  It is also useful for
- * descending into subqueries within a walker.
- *
- * If visitQueryRTEs is true, the walker will also be called on sub-Query
- * nodes present in subquery rangetable entries of the given Query.  This
- * is optional since some callers handle those sub-queries separately,
- * or don't really want to see subqueries anyway.
- */
-bool
-query_tree_walker(Query *query,
-				  bool (*walker) (),
-				  void *context,
-				  bool visitQueryRTEs)
-{
-	List	   *rt;
-
-	Assert(query != NULL && IsA(query, Query));
-
-	if (walker((Node *) query->targetList, context))
-		return true;
-	if (walker((Node *) query->jointree, context))
-		return true;
-	if (walker(query->setOperations, context))
-		return true;
-	if (walker(query->havingQual, context))
-		return true;
-	foreach(rt, query->rtable)
-	{
-		RangeTblEntry *rte = (RangeTblEntry *) lfirst(rt);
-
-		switch (rte->rtekind)
-		{
-			case RTE_RELATION:
-			case RTE_SPECIAL:
-				/* nothing to do */
-				break;
-			case RTE_SUBQUERY:
-				if (visitQueryRTEs)
-					if (walker(rte->subquery, context))
-						return true;
-				break;
-			case RTE_JOIN:
-				if (walker(rte->joinaliasvars, context))
-					return true;
-				break;
-			case RTE_FUNCTION:
-				if (walker(rte->funcexpr, context))
-					return true;
-				break;
-		}
-	}
-	return false;
-}
-
-
-/*--------------------
- * expression_tree_mutator() is designed to support routines that make a
- * modified copy of an expression tree, with some nodes being added,
- * removed, or replaced by new subtrees.  The original tree is (normally)
- * not changed.  Each recursion level is responsible for returning a copy of
- * (or appropriately modified substitute for) the subtree it is handed.
- * A mutator routine should look like this:
- *
- * Node * my_mutator (Node *node, my_struct *context)
- * {
- *		if (node == NULL)
- *			return NULL;
- *		// check for nodes that special work is required for, eg:
- *		if (IsA(node, Var))
- *		{
- *			... create and return modified copy of Var node
- *		}
- *		else if (IsA(node, ...))
- *		{
- *			... do special transformations of other node types
- *		}
- *		// for any node type not specially processed, do:
- *		return expression_tree_mutator(node, my_mutator, (void *) context);
- * }
- *
- * The "context" argument points to a struct that holds whatever context
- * information the mutator routine needs --- it can be used to return extra
- * data gathered by the mutator, too.  This argument is not touched by
- * expression_tree_mutator, but it is passed down to recursive sub-invocations
- * of my_mutator.  The tree walk is started from a setup routine that
- * fills in the appropriate context struct, calls my_mutator with the
- * top-level node of the tree, and does any required post-processing.
- *
- * Each level of recursion must return an appropriately modified Node.
- * If expression_tree_mutator() is called, it will make an exact copy
- * of the given Node, but invoke my_mutator() to copy the sub-node(s)
- * of that Node.  In this way, my_mutator() has full control over the
- * copying process but need not directly deal with expression trees
- * that it has no interest in.
- *
- * Just as for expression_tree_walker, the node types handled by
- * expression_tree_mutator include all those normally found in target lists
- * and qualifier clauses during the planning stage.
- *
- * expression_tree_mutator will handle a SUBPLAN_EXPR node by recursing into
- * the args and slink->oper lists (which belong to the outer plan), but it
- * will simply copy the link to the inner plan, since that's typically what
- * expression tree mutators want.  A mutator that wants to modify the subplan
- * can force appropriate behavior by recognizing subplan expression nodes
- * and doing the right thing.
- *
- * Bare SubLink nodes (without a SUBPLAN_EXPR) are handled by recursing into
- * the "lefthand" argument list only.  (A bare SubLink should be seen only if
- * the tree has not yet been processed by subselect.c.)  Again, this can be
- * overridden by the mutator, but it seems to be the most useful default
- * behavior.
- *--------------------
- */
-
-Node *
-expression_tree_mutator(Node *node,
-						Node *(*mutator) (),
-						void *context)
-{
-	/*
-	 * The mutator has already decided not to modify the current node, but
-	 * we must call the mutator for any sub-nodes.
-	 */
-
-#define FLATCOPY(newnode, node, nodetype)  \
-	( (newnode) = makeNode(nodetype), \
-	  memcpy((newnode), (node), sizeof(nodetype)) )
-
-#define CHECKFLATCOPY(newnode, node, nodetype)	\
-	( AssertMacro(IsA((node), nodetype)), \
-	  (newnode) = makeNode(nodetype), \
-	  memcpy((newnode), (node), sizeof(nodetype)) )
-
-#define MUTATE(newfield, oldfield, fieldtype)  \
-		( (newfield) = (fieldtype) mutator((Node *) (oldfield), context) )
-
-	if (node == NULL)
-		return NULL;
-	switch (nodeTag(node))
-	{
-		case T_Const:
-		case T_Var:
-		case T_Param:
-		case T_RangeTblRef:
-			/* primitive node types with no subnodes */
-			return (Node *) copyObject(node);
-		case T_Expr:
-			{
-				Expr	   *expr = (Expr *) node;
-				Expr	   *newnode;
-
-				FLATCOPY(newnode, expr, Expr);
-
-				if (expr->opType == SUBPLAN_EXPR)
-				{
-					SubLink    *oldsublink = ((SubPlan *) expr->oper)->sublink;
-					SubPlan    *newsubplan;
-
-					/* flat-copy the oper node, which is a SubPlan */
-					CHECKFLATCOPY(newsubplan, expr->oper, SubPlan);
-					newnode->oper = (Node *) newsubplan;
-					/* likewise its SubLink node */
-					CHECKFLATCOPY(newsubplan->sublink, oldsublink, SubLink);
-
-					/*
-					 * transform args list (params to be passed to
-					 * subplan)
-					 */
-					MUTATE(newnode->args, expr->args, List *);
-					/* transform sublink's oper list as well */
-					MUTATE(newsubplan->sublink->oper, oldsublink->oper, List *);
-
-					/*
-					 * but not the subplan itself, which is referenced
-					 * as-is
-					 */
-				}
-				else
-				{
-					/*
-					 * for other Expr node types, just transform args
-					 * list, linking to original oper node (OK?)
-					 */
-					MUTATE(newnode->args, expr->args, List *);
-				}
-				return (Node *) newnode;
-			}
-			break;
-		case T_Aggref:
-			{
-				Aggref	   *aggref = (Aggref *) node;
-				Aggref	   *newnode;
-
-				FLATCOPY(newnode, aggref, Aggref);
-				MUTATE(newnode->target, aggref->target, Node *);
-				return (Node *) newnode;
-			}
-			break;
-		case T_ArrayRef:
-			{
-				ArrayRef   *arrayref = (ArrayRef *) node;
-				ArrayRef   *newnode;
-
-				FLATCOPY(newnode, arrayref, ArrayRef);
-				MUTATE(newnode->refupperindexpr, arrayref->refupperindexpr,
-					   List *);
-				MUTATE(newnode->reflowerindexpr, arrayref->reflowerindexpr,
-					   List *);
-				MUTATE(newnode->refexpr, arrayref->refexpr,
-					   Node *);
-				MUTATE(newnode->refassgnexpr, arrayref->refassgnexpr,
-					   Node *);
-				return (Node *) newnode;
-			}
-			break;
-		case T_FieldSelect:
-			{
-				FieldSelect *fselect = (FieldSelect *) node;
-				FieldSelect *newnode;
-
-				FLATCOPY(newnode, fselect, FieldSelect);
-				MUTATE(newnode->arg, fselect->arg, Node *);
-				return (Node *) newnode;
-			}
-			break;
-		case T_RelabelType:
-			{
-				RelabelType *relabel = (RelabelType *) node;
-				RelabelType *newnode;
-
-				FLATCOPY(newnode, relabel, RelabelType);
-				MUTATE(newnode->arg, relabel->arg, Node *);
-				return (Node *) newnode;
-			}
-			break;
-		case T_CaseExpr:
-			{
-				CaseExpr   *caseexpr = (CaseExpr *) node;
-				CaseExpr   *newnode;
-
-				FLATCOPY(newnode, caseexpr, CaseExpr);
-				MUTATE(newnode->args, caseexpr->args, List *);
-				/* caseexpr->arg should be null, but we'll check it anyway */
-				MUTATE(newnode->arg, caseexpr->arg, Node *);
-				MUTATE(newnode->defresult, caseexpr->defresult, Node *);
-				return (Node *) newnode;
-			}
-			break;
-		case T_CaseWhen:
-			{
-				CaseWhen   *casewhen = (CaseWhen *) node;
-				CaseWhen   *newnode;
-
-				FLATCOPY(newnode, casewhen, CaseWhen);
-				MUTATE(newnode->expr, casewhen->expr, Node *);
-				MUTATE(newnode->result, casewhen->result, Node *);
-				return (Node *) newnode;
-			}
-			break;
-		case T_NullTest:
-			{
-				NullTest   *ntest = (NullTest *) node;
-				NullTest   *newnode;
-
-				FLATCOPY(newnode, ntest, NullTest);
-				MUTATE(newnode->arg, ntest->arg, Node *);
-				return (Node *) newnode;
-			}
-			break;
-		case T_BooleanTest:
-			{
-				BooleanTest *btest = (BooleanTest *) node;
-				BooleanTest *newnode;
-
-				FLATCOPY(newnode, btest, BooleanTest);
-				MUTATE(newnode->arg, btest->arg, Node *);
-				return (Node *) newnode;
-			}
-			break;
-		case T_SubLink:
-			{
-				/*
-				 * A "bare" SubLink (note we will not come here if we
-				 * found a SUBPLAN_EXPR node above it).  Transform the
-				 * lefthand side, but not the oper list nor the subquery.
-				 */
-				SubLink    *sublink = (SubLink *) node;
-				SubLink    *newnode;
-
-				FLATCOPY(newnode, sublink, SubLink);
-				MUTATE(newnode->lefthand, sublink->lefthand, List *);
-				return (Node *) newnode;
-			}
-			break;
-		case T_List:
-			{
-				/*
-				 * We assume the mutator isn't interested in the list
-				 * nodes per se, so just invoke it on each list element.
-				 * NOTE: this would fail badly on a list with integer
-				 * elements!
-				 */
-				List	   *resultlist = NIL;
-				List	   *temp;
-
-				foreach(temp, (List *) node)
-				{
-					resultlist = lappend(resultlist,
-										 mutator((Node *) lfirst(temp),
-												 context));
-				}
-				return (Node *) resultlist;
-			}
-			break;
-		case T_TargetEntry:
-			{
-				/*
-				 * We mutate the expression, but not the resdom, by
-				 * default.
-				 */
-				TargetEntry *targetentry = (TargetEntry *) node;
-				TargetEntry *newnode;
-
-				FLATCOPY(newnode, targetentry, TargetEntry);
-				MUTATE(newnode->expr, targetentry->expr, Node *);
-				return (Node *) newnode;
-			}
-			break;
-		case T_FromExpr:
-			{
-				FromExpr   *from = (FromExpr *) node;
-				FromExpr   *newnode;
-
-				FLATCOPY(newnode, from, FromExpr);
-				MUTATE(newnode->fromlist, from->fromlist, List *);
-				MUTATE(newnode->quals, from->quals, Node *);
-				return (Node *) newnode;
-			}
-			break;
-		case T_JoinExpr:
-			{
-				JoinExpr   *join = (JoinExpr *) node;
-				JoinExpr   *newnode;
-
-				FLATCOPY(newnode, join, JoinExpr);
-				MUTATE(newnode->larg, join->larg, Node *);
-				MUTATE(newnode->rarg, join->rarg, Node *);
-				MUTATE(newnode->quals, join->quals, Node *);
-				/* We do not mutate alias or using by default */
-				return (Node *) newnode;
-			}
-			break;
-		case T_SetOperationStmt:
-			{
-				SetOperationStmt *setop = (SetOperationStmt *) node;
-				SetOperationStmt *newnode;
-
-				FLATCOPY(newnode, setop, SetOperationStmt);
-				MUTATE(newnode->larg, setop->larg, Node *);
-				MUTATE(newnode->rarg, setop->rarg, Node *);
-				return (Node *) newnode;
-			}
-			break;
-		default:
-			elog(ERROR, "expression_tree_mutator: Unexpected node type %d",
-				 nodeTag(node));
-			break;
-	}
-	/* can't get here, but keep compiler happy */
-	return NULL;
-}
-
-
-/*
- * query_tree_mutator --- initiate modification of a Query's expressions
- *
- * This routine exists just to reduce the number of places that need to know
- * where all the expression subtrees of a Query are.  Note it can be used
- * for starting a walk at top level of a Query regardless of whether the
- * mutator intends to descend into subqueries.	It is also useful for
- * descending into subqueries within a mutator.
- *
- * The specified Query node is modified-in-place; do a FLATCOPY() beforehand
- * if you don't want to change the original.  All substructure is safely
- * copied, however.
- *
- * If visitQueryRTEs is true, the mutator will also be called on sub-Query
- * nodes present in subquery rangetable entries of the given Query.  This
- * is optional since some callers handle those sub-queries separately,
- * or don't really want to see subqueries anyway.
- */
-void
-query_tree_mutator(Query *query,
-				   Node *(*mutator) (),
-				   void *context,
-				   bool visitQueryRTEs)
-{
-	List	   *newrt = NIL;
-	List	   *rt;
-
-	Assert(query != NULL && IsA(query, Query));
-
-	MUTATE(query->targetList, query->targetList, List *);
-	MUTATE(query->jointree, query->jointree, FromExpr *);
-	MUTATE(query->setOperations, query->setOperations, Node *);
-	MUTATE(query->havingQual, query->havingQual, Node *);
-	foreach(rt, query->rtable)
-	{
-		RangeTblEntry *rte = (RangeTblEntry *) lfirst(rt);
-		RangeTblEntry *newrte;
-
-		switch (rte->rtekind)
-		{
-			case RTE_RELATION:
-			case RTE_SPECIAL:
-				/* nothing to do, don't bother to make a copy */
-				break;
-			case RTE_SUBQUERY:
-				if (visitQueryRTEs)
-				{
-					FLATCOPY(newrte, rte, RangeTblEntry);
-					CHECKFLATCOPY(newrte->subquery, rte->subquery, Query);
-					MUTATE(newrte->subquery, newrte->subquery, Query *);
-					rte = newrte;
-				}
-				break;
-			case RTE_JOIN:
-				FLATCOPY(newrte, rte, RangeTblEntry);
-				MUTATE(newrte->joinaliasvars, rte->joinaliasvars, List *);
-				rte = newrte;
-				break;
-			case RTE_FUNCTION:
-				FLATCOPY(newrte, rte, RangeTblEntry);
-				MUTATE(newrte->funcexpr, rte->funcexpr, Node *);
-				rte = newrte;
-				break;
-		}
-		newrt = lappend(newrt, rte);
-	}
-	query->rtable = newrt;
-}