granicus.if.org Git - postgresql/blob - src/include/executor/execdesc.h

   1 /*-------------------------------------------------------------------------
   2  *
   3  * execdesc.h
   4  *        plan and query descriptor accessor macros used by the executor
   5  *        and related modules.
   6  *
   7  *
   8  * Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
   9  * Portions Copyright (c) 1994, Regents of the University of California
  10  *
  11  * $PostgreSQL: pgsql/src/include/executor/execdesc.h,v 1.32 2006/07/11 16:35:33 momjian Exp $
  12  *
  13  *-------------------------------------------------------------------------
  14  */
  15 #ifndef EXECDESC_H
  16 #define EXECDESC_H
  17
  18 #include "nodes/execnodes.h"
  19 #include "nodes/parsenodes.h"
  20 #include "tcop/dest.h"
  21
  22
  23 /* ----------------
  24  *              query descriptor:
  25  *
  26  *      a QueryDesc encapsulates everything that the executor
  27  *      needs to execute the query
  28  * ---------------------
  29  */
  30 typedef struct QueryDesc
  31 {
  32         /* These fields are provided by CreateQueryDesc */
  33         CmdType         operation;              /* CMD_SELECT, CMD_UPDATE, etc. */
  34         Query      *parsetree;          /* rewritten parsetree */
  35         Plan       *plantree;           /* planner's output */
  36         Snapshot        snapshot;               /* snapshot to use for query */
  37         Snapshot        crosscheck_snapshot;    /* crosscheck for RI update/delete */
  38         DestReceiver *dest;                     /* the destination for tuple output */
  39         ParamListInfo params;           /* param values being passed in */
  40         bool            doInstrument;   /* TRUE requests runtime instrumentation */
  41
  42         /* These fields are set by ExecutorStart */
  43         TupleDesc       tupDesc;                /* descriptor for result tuples */
  44         EState     *estate;                     /* executor's query-wide state */
  45         PlanState  *planstate;          /* tree of per-plan-node state */
  46 } QueryDesc;
  47
  48 /* in pquery.c */
  49 extern QueryDesc *CreateQueryDesc(Query *parsetree, Plan *plantree,
  50                                 Snapshot snapshot,
  51                                 Snapshot crosscheck_snapshot,
  52                                 DestReceiver *dest,
  53                                 ParamListInfo params,
  54                                 bool doInstrument);
  55
  56 extern void FreeQueryDesc(QueryDesc *qdesc);
  57
  58 #endif   /* EXECDESC_H  */