subselect.h

来自「PostgreSQL 8.2中增加了很多企业用户所需要的功能和性能上的提高,其开」· C头文件 代码 · 共 32 行

/*-------------------------------------------------------------------------
 *
 * subselect.h
 *
 * Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * $PostgreSQL: pgsql/src/include/optimizer/subselect.h,v 1.27 2006/03/05 15:58:57 momjian Exp $
 *
 *-------------------------------------------------------------------------
 */
#ifndef SUBSELECT_H
#define SUBSELECT_H

#include "nodes/plannodes.h"
#include "nodes/relation.h"


extern Index PlannerQueryLevel; /* level of current query */
extern List *PlannerInitPlan;	/* init subplans for current query */
extern List *PlannerParamList;	/* to keep track of cross-level Params */
extern int	PlannerPlanId;		/* to assign unique ID to subquery plans */

extern Node *convert_IN_to_join(PlannerInfo *root, SubLink *sublink);
extern Node *SS_replace_correlation_vars(Node *expr);
extern Node *SS_process_sublinks(Node *expr, bool isQual);
extern void SS_finalize_plan(Plan *plan, List *rtable);
extern Param *SS_make_initplan_from_plan(PlannerInfo *root, Plan *plan,
						   Oid resulttype, int32 resulttypmod);

#endif   /* SUBSELECT_H */