Function CreateQueryDesc

src/backend/tcop/pquery.c:89–131

* CreateQueryDesc * * N.B. If sliceTable is non-NULL in the top node of plantree, then * nMotionNodes and nParamExec must be set correctly, as well, and * the QueryDesc will be arranged so that ExecutorStart and ExecutorRun * will handle plan slicing. */

 * will handle plan slicing.
 */
QueryDesc *
CreateQueryDesc(PlannedStmt *plannedstmt,
				const char *sourceText,
				Snapshot snapshot,
				Snapshot crosscheck_snapshot,
				DestReceiver *dest,
				ParamListInfo params,
				QueryEnvironment *queryEnv,
				int instrument_options)
{
	QueryDesc  *qd = (QueryDesc *) palloc(sizeof(QueryDesc));

	qd->operation = plannedstmt->commandType;	/* operation */
	qd->plannedstmt = plannedstmt;	/* plan */
	qd->sourceText = sourceText;	/* query text */
	qd->snapshot = RegisterSnapshot(snapshot);	/* snapshot */
	/* RI check snapshot */
	qd->crosscheck_snapshot = RegisterSnapshot(crosscheck_snapshot);
	qd->dest = dest;			/* output dest */
	qd->params = params;		/* parameter values passed into query */
	qd->queryEnv = queryEnv;
	qd->instrument_options = instrument_options;	/* instrumentation wanted? */

	/* null these fields until set by ExecutorStart */
	qd->tupDesc = NULL;
	qd->estate = NULL;
	qd->planstate = NULL;
	qd->totaltime = NULL;

	qd->extended_query = false; /* default value */
	qd->portal_name = NULL;
	qd->showstatctx = NULL;

	qd->ddesc = NULL;

	/* not yet executed */
	qd->already_executed = false;

	if (Gp_role != GP_ROLE_EXECUTE)
		increment_command_count();

	return qd;
}

/*
 * FreeQueryDesc