greenplumn cdbdisp_query 源码

greenplumn cdbdisp_query 代码

文件路径：/src/include/cdb/cdbdisp_query.h

/*-------------------------------------------------------------------------
 *
 * cdbdisp_query.h
 * routines for dispatching command string or plan to the qExec processes.
 *
 * Portions Copyright (c) 2005-2008, Greenplum inc
 * Portions Copyright (c) 2012-Present VMware, Inc. or its affiliates.
 *
 *
 * IDENTIFICATION
 *	    src/include/cdb/cdbdisp_query.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef CDBDISP_QUERY_H
#define CDBDISP_QUERY_H

#include "lib/stringinfo.h" /* StringInfo */
#include "cdb/cdbtm.h"

#define DF_NONE 0x0

/*
 * indicate whether an error occurring on one of the qExec segdbs should cause all still-executing
 * commands to cancel on other qExecs, normally this would be true.
 */
#define DF_CANCEL_ON_ERROR 0x1
/*
 * indicate whether the command to be dispatched should be done inside of a global transaction.
 */
#define DF_NEED_TWO_PHASE 0x2
/*
 * indicate whether the command should be dispatched to qExecs along with a snapshot.
 */
#define DF_WITH_SNAPSHOT  0x4

struct QueryDesc;
struct SerializedParams;
struct CdbDispatcherState;
struct CdbPgResults;
struct CdbCopy;

/* Compose and dispatch the MPPEXEC commands corresponding to a plan tree
 * within a complete parallel plan.
 *
 * The CdbDispatchResults objects allocated for the plan are
 * returned in *pPrimaryResults
 * The caller, after calling CdbCheckDispatchResult(), can
 * examine the CdbDispatchResults objects, can keep them as
 * long as needed, and ultimately must free them with
 * cdbdisp_destroyDispatchState() prior to deallocation
 * of the caller's memory context.
 *
 * NB: Callers should use PG_TRY()/PG_CATCH() if needed to make
 * certain that the CdbDispatchResults objects are destroyed by
 * cdbdisp_destroyDispatchState() in case of error.
 * To wait for completion, check for errors, and clean up, it is
 * suggested that the caller use cdbdisp_finishCommand().
 */
extern void CdbDispatchPlan(struct QueryDesc *queryDesc,
							ParamExecData *execParams,
							bool planRequiresTxn,
							bool cancelOnError);

/*
 * Special for sending SET commands that change GUC variables, so they go to all
 * gangs, both reader and writer
 */
extern void CdbDispatchSetCommand(const char *strCommand, bool cancelOnError);

/*
 * CdbDispatchCommand
 *
 * Dispatch an plain command to all primary writer QEs, wait until
 * all QEs finished successfully. If one or more QEs got error,
 * throw an Error.
 *
 * -flags:
 * 	Is the combination of EUS_NEED_TWO_PHASE, EUS_WITH_SNAPSHOT,EUS_CANCEL_ON_ERROR
 *
 */
extern void CdbDispatchCommand(const char *strCommand,
							   int flags,
							   struct CdbPgResults *cdb_pgresults);

extern void CdbDispatchCommandToSegments(const char *strCommand,
										 int flags,
										 List *segments,
										 struct CdbPgResults *cdb_pgresults);

/*
 * CdbDispatchUtilityStatement
 *
 * Dispatch an already parsed statement to all primary writer QEs, wait until
 * all QEs finished successfully. If one or more QEs got error,
 * throw an Error.
 *
 * -flags:
 * 	Is the combination of DF_NEED_TWO_PHASE, DF_WITH_SNAPSHOT,DF_CANCEL_ON_ERROR
 *
 * -cdb_pgresults:
 * 	Indicate whether return the pg_result for each QE connection.
 *
 * If returnPgResults is true, caller need to call cdbdisp_freeCdbPgResults() to
 * clear pg_results.
 */
extern void CdbDispatchUtilityStatement(struct Node *stmt,
										int flags,
										List *oid_assignments,
										struct CdbPgResults* cdb_pgresults);

extern void CdbDispatchCopyStart(struct CdbCopy *cdbCopy, Node *stmt, int flags);
extern void CdbDispatchCopyEnd(struct CdbCopy *cdbCopy);

extern ParamListInfo deserializeExternParams(struct SerializedParams *sparams);

#endif   /* CDBDISP_QUERY_H */

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