/*-------------------------------------------------------------------------
 *
 * rewriteManip.h
 *		Querytree manipulation subroutines for query rewriter.
 *
 *
 * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * $PostgreSQL: pgsql/src/include/rewrite/rewriteManip.h,v 1.50.2.1 2009/09/02 17:52:33 tgl Exp $
 *
 *-------------------------------------------------------------------------
 */
#ifndef REWRITEMANIP_H
#define REWRITEMANIP_H

#include "nodes/parsenodes.h"


typedef struct replace_rte_variables_context replace_rte_variables_context;

typedef Node * (*replace_rte_variables_callback) (Var *var,
									replace_rte_variables_context *context);

struct replace_rte_variables_context
{
	replace_rte_variables_callback callback;	/* callback function */
	void	   *callback_arg;		/* context data for callback function */
	int			target_varno;		/* RTE index to search for */
	int			sublevels_up;		/* (current) nesting depth */
	bool		inserted_sublink;	/* have we inserted a SubLink? */
};


extern void OffsetVarNodes(Node *node, int offset, int sublevels_up);
extern void ChangeVarNodes(Node *node, int old_varno, int new_varno,
			   int sublevels_up);
extern void IncrementVarSublevelsUp(Node *node, int delta_sublevels_up,
						int min_sublevels_up);
extern void IncrementVarSublevelsUp_rtable(List *rtable,
							   int delta_sublevels_up, int min_sublevels_up);

extern bool rangeTableEntry_used(Node *node, int rt_index,
					 int sublevels_up);
extern bool attribute_used(Node *node, int rt_index, int attno,
			   int sublevels_up);

extern Query *getInsertSelectQuery(Query *parsetree, Query ***subquery_ptr);

extern void AddQual(Query *parsetree, Node *qual);
extern void AddInvertedQual(Query *parsetree, Node *qual);

extern bool contain_aggs_of_level(Node *node, int levelsup);
extern int	locate_agg_of_level(Node *node, int levelsup);
extern int	locate_windowfunc(Node *node);
extern bool checkExprHasAggs(Node *node);
extern bool checkExprHasWindowFuncs(Node *node);
extern bool checkExprHasSubLink(Node *node);

extern Node *replace_rte_variables(Node *node,
					  int target_varno, int sublevels_up,
					  replace_rte_variables_callback callback,
					  void *callback_arg,
					  bool *outer_hasSubLinks);
extern Node *replace_rte_variables_mutator(Node *node,
							  replace_rte_variables_context *context);

extern Node *map_variable_attnos(Node *node,
					int target_varno, int sublevels_up,
					const AttrNumber *attno_map, int map_length,
					bool *found_whole_row);

extern Node *ResolveNew(Node *node, int target_varno, int sublevels_up,
		   RangeTblEntry *target_rte,
		   List *targetlist, int event, int update_varno,
		   bool *outer_hasSubLinks);

#endif   /* REWRITEMANIP_H */
