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cd35e9d746
* Refactor explain.c slightly to export a convenient-to-use subroutine for printing EXPLAIN results. * Provide hooks for plugins to get control at ExecutorStart and ExecutorEnd as well as ExecutorRun. * Add some minimal support for tracking the total runtime of ExecutorRun. This code won't actually do anything unless a plugin prods it to. * Change the API of the DefineCustomXXXVariable functions to allow nonzero "flags" to be specified for a custom GUC variable. While at it, also make the "bootstrap" default value for custom GUCs be explicitly specified as a parameter to these functions. This is to eliminate confusion over where the default comes from, as has been expressed in the past by some users of the custom-variable facility. * Refactor GUC code a bit to ensure that a custom variable gets initialized to something valid (like its default value) even if the placeholder value was invalid.
70 lines
2.3 KiB
C
70 lines
2.3 KiB
C
/*-------------------------------------------------------------------------
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*
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* execdesc.h
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* plan and query descriptor accessor macros used by the executor
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* and related modules.
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*
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*
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* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/executor/execdesc.h,v 1.38 2008/11/19 01:10:23 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef EXECDESC_H
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#define EXECDESC_H
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#include "nodes/execnodes.h"
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#include "nodes/plannodes.h"
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#include "tcop/dest.h"
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/* ----------------
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* query descriptor:
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*
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* a QueryDesc encapsulates everything that the executor
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* needs to execute the query.
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*
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* For the convenience of SQL-language functions, we also support QueryDescs
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* containing utility statements; these must not be passed to the executor
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* however.
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* ---------------------
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*/
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typedef struct QueryDesc
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{
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/* These fields are provided by CreateQueryDesc */
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CmdType operation; /* CMD_SELECT, CMD_UPDATE, etc. */
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PlannedStmt *plannedstmt; /* planner's output, or null if utility */
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Node *utilitystmt; /* utility statement, or null */
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Snapshot snapshot; /* snapshot to use for query */
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Snapshot crosscheck_snapshot; /* crosscheck for RI update/delete */
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DestReceiver *dest; /* the destination for tuple output */
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ParamListInfo params; /* param values being passed in */
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bool doInstrument; /* TRUE requests runtime instrumentation */
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/* These fields are set by ExecutorStart */
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TupleDesc tupDesc; /* descriptor for result tuples */
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EState *estate; /* executor's query-wide state */
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PlanState *planstate; /* tree of per-plan-node state */
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/* This is always set NULL by the core system, but plugins can change it */
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struct Instrumentation *totaltime; /* total time spent in ExecutorRun */
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} QueryDesc;
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/* in pquery.c */
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extern QueryDesc *CreateQueryDesc(PlannedStmt *plannedstmt,
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Snapshot snapshot,
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Snapshot crosscheck_snapshot,
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DestReceiver *dest,
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ParamListInfo params,
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bool doInstrument);
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extern QueryDesc *CreateUtilityQueryDesc(Node *utilitystmt,
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Snapshot snapshot,
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DestReceiver *dest,
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ParamListInfo params);
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extern void FreeQueryDesc(QueryDesc *qdesc);
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#endif /* EXECDESC_H */
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