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Current File : /proc/3/cwd/usr/include/postgresql/9.6/server/executor/execdesc.h
/*-------------------------------------------------------------------------
 *
 * execdesc.h
 *	  plan and query descriptor accessor macros used by the executor
 *	  and related modules.
 *
 *
 * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/executor/execdesc.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef EXECDESC_H
#define EXECDESC_H

#include "nodes/execnodes.h"
#include "tcop/dest.h"


/* ----------------
 *		query descriptor:
 *
 *	a QueryDesc encapsulates everything that the executor
 *	needs to execute the query.
 *
 *	For the convenience of SQL-language functions, we also support QueryDescs
 *	containing utility statements; these must not be passed to the executor
 *	however.
 * ---------------------
 */
typedef struct QueryDesc
{
	/* These fields are provided by CreateQueryDesc */
	CmdType		operation;		/* CMD_SELECT, CMD_UPDATE, etc. */
	PlannedStmt *plannedstmt;	/* planner's output, or null if utility */
	Node	   *utilitystmt;	/* utility statement, or null */
	const char *sourceText;		/* source text of the query */
	Snapshot	snapshot;		/* snapshot to use for query */
	Snapshot	crosscheck_snapshot;	/* crosscheck for RI update/delete */
	DestReceiver *dest;			/* the destination for tuple output */
	ParamListInfo params;		/* param values being passed in */
	int			instrument_options;		/* OR of InstrumentOption flags */

	/* These fields are set by ExecutorStart */
	TupleDesc	tupDesc;		/* descriptor for result tuples */
	EState	   *estate;			/* executor's query-wide state */
	PlanState  *planstate;		/* tree of per-plan-node state */

	/* This is always set NULL by the core system, but plugins can change it */
	struct Instrumentation *totaltime;	/* total time spent in ExecutorRun */
} QueryDesc;

/* in pquery.c */
extern QueryDesc *CreateQueryDesc(PlannedStmt *plannedstmt,
				const char *sourceText,
				Snapshot snapshot,
				Snapshot crosscheck_snapshot,
				DestReceiver *dest,
				ParamListInfo params,
				int instrument_options);

extern QueryDesc *CreateUtilityQueryDesc(Node *utilitystmt,
					   const char *sourceText,
					   Snapshot snapshot,
					   DestReceiver *dest,
					   ParamListInfo params);

extern void FreeQueryDesc(QueryDesc *qdesc);

#endif   /* EXECDESC_H  */

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