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/*-------------------------------------------------------------------------
*
* execdesc.h
* plan and query descriptor accessor macros used by the executor
* and related modules.
*
*
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/executor/execdesc.h,v 1.30 2004/12/31 22:03:29 pgsql Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef EXECDESC_H
#define EXECDESC_H
#include "nodes/parsenodes.h"
#include "nodes/execnodes.h"
#include "tcop/dest.h"
/* ----------------
* query descriptor:
*
* a QueryDesc encapsulates everything that the executor
* needs to execute the query
* ---------------------
*/
typedef struct QueryDesc
{
/* These fields are provided by CreateQueryDesc */
CmdType operation; /* CMD_SELECT, CMD_UPDATE, etc. */
Query *parsetree; /* rewritten parsetree */
Plan *plantree; /* planner's output */
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 */
bool doInstrument; /* TRUE requests runtime instrumentation */
/* 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 */
} QueryDesc;
/* in pquery.c */
extern QueryDesc *CreateQueryDesc(Query *parsetree, Plan *plantree,
Snapshot snapshot,
Snapshot crosscheck_snapshot,
DestReceiver *dest,
ParamListInfo params,
bool doInstrument);
extern void FreeQueryDesc(QueryDesc *qdesc);
#endif /* EXECDESC_H */
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