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/*-------------------------------------------------------------------------
*
* execdesc.h
* plan and query descriptor accessor macros used by the executor
* and related modules.
*
*
* Portions Copyright (c) 1996-2012, 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 */