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C++ ExecReScan函数代码示例

原作者: [db:作者] 来自: [db:来源] 收藏 邀请

本文整理汇总了C++中ExecReScan函数的典型用法代码示例。如果您正苦于以下问题:C++ ExecReScan函数的具体用法?C++ ExecReScan怎么用?C++ ExecReScan使用的例子?那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。



在下文中一共展示了ExecReScan函数的20个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于我们的系统推荐出更棒的C++代码示例。

示例1: ExecReScanMaterial

/* ----------------------------------------------------------------
 *		ExecReScanMaterial
 *
 *		Rescans the materialized relation.
 * ----------------------------------------------------------------
 */
void
ExecReScanMaterial(MaterialState *node)
{
	PlanState  *outerPlan = outerPlanState(node);

	ExecClearTuple(node->ss.ps.ps_ResultTupleSlot);

	if (node->eflags != 0)
	{
		/*
		 * If we haven't materialized yet, just return. If outerplan's
		 * chgParam is not NULL then it will be re-scanned by ExecProcNode,
		 * else no reason to re-scan it at all.
		 */
		if (!node->tuplestorestate)
			return;

		/*
		 * If subnode is to be rescanned then we forget previous stored
		 * results; we have to re-read the subplan and re-store.  Also, if we
		 * told tuplestore it needn't support rescan, we lose and must
		 * re-read.  (This last should not happen in common cases; else our
		 * caller lied by not passing EXEC_FLAG_REWIND to us.)
		 *
		 * Otherwise we can just rewind and rescan the stored output. The
		 * state of the subnode does not change.
		 */
		if (outerPlan->chgParam != NULL ||
			(node->eflags & EXEC_FLAG_REWIND) == 0)
		{
			tuplestore_end(node->tuplestorestate);
			node->tuplestorestate = NULL;
			if (outerPlan->chgParam == NULL)
				ExecReScan(outerPlan);
			node->eof_underlying = false;
		}
		else
			tuplestore_rescan(node->tuplestorestate);
	}
	else
	{
		/* In this case we are just passing on the subquery's output */

		/*
		 * if chgParam of subnode is not null then plan will be re-scanned by
		 * first ExecProcNode.
		 */
		if (outerPlan->chgParam == NULL)
			ExecReScan(outerPlan);
		node->eof_underlying = false;
	}
}
开发者ID:adityavs,项目名称:postgres,代码行数:58,代码来源:nodeMaterial.c


示例2: ExecSubqueryReScan

/* ----------------------------------------------------------------
 *		ExecSubqueryReScan
 *
 *		Rescans the relation.
 * ----------------------------------------------------------------
 */
void
ExecSubqueryReScan(SubqueryScanState *node, ExprContext *exprCtxt)
{
	EState	   *estate;

	estate = node->ss.ps.state;

	ItemPointerSet(&node->cdb_fake_ctid, 0, 0);

	/*
	 * ExecReScan doesn't know about my subplan, so I have to do
	 * changed-parameter signaling myself.	This is just as well, because the
	 * subplan has its own memory context in which its chgParam state lives.
	 */
	if (node->ss.ps.chgParam != NULL)
		UpdateChangedParamSet(node->subplan, node->ss.ps.chgParam);

	/*
	 * if chgParam of subnode is not null then plan will be re-scanned by
	 * first ExecProcNode.
	 */
	if (node->subplan->chgParam == NULL)
		ExecReScan(node->subplan, NULL);

	node->ss.ss_ScanTupleSlot = NULL;
	/*node->ss.ps.ps_TupFromTlist = false;*/

	Gpmon_M_Incr(GpmonPktFromSubqueryScanState(node), GPMON_SUBQUERYSCAN_RESCAN);
	CheckSendPlanStateGpmonPkt(&node->ss.ps);
}
开发者ID:LJoNe,项目名称:gpdb,代码行数:36,代码来源:nodeSubqueryscan.c


示例3: ExecReScanBitmapHeapScan

/* ----------------------------------------------------------------
 *		ExecReScanBitmapHeapScan(node)
 * ----------------------------------------------------------------
 */
void
ExecReScanBitmapHeapScan(BitmapHeapScanState *node)
{
	PlanState  *outerPlan = outerPlanState(node);

	/* rescan to release any page pin */
	heap_rescan(node->ss.ss_currentScanDesc, NULL);

	if (node->tbmiterator)
		tbm_end_iterate(node->tbmiterator);
	if (node->prefetch_iterator)
		tbm_end_iterate(node->prefetch_iterator);
	if (node->shared_tbmiterator)
		tbm_end_shared_iterate(node->shared_tbmiterator);
	if (node->shared_prefetch_iterator)
		tbm_end_shared_iterate(node->shared_prefetch_iterator);
	if (node->tbm)
		tbm_free(node->tbm);
	node->tbm = NULL;
	node->tbmiterator = NULL;
	node->tbmres = NULL;
	node->prefetch_iterator = NULL;
	node->initialized = false;
	node->shared_tbmiterator = NULL;
	node->shared_prefetch_iterator = NULL;

	ExecScanReScan(&node->ss);

	/*
	 * if chgParam of subnode is not null then plan will be re-scanned by
	 * first ExecProcNode.
	 */
	if (outerPlan->chgParam == NULL)
		ExecReScan(outerPlan);
}
开发者ID:BertrandAreal,项目名称:postgres,代码行数:39,代码来源:nodeBitmapHeapscan.c


示例4: ExecSubqueryReScan

/* ----------------------------------------------------------------
 *		ExecSubqueryReScan
 *
 *		Rescans the relation.
 * ----------------------------------------------------------------
 */
void
ExecSubqueryReScan(SubqueryScanState *node, ExprContext *exprCtxt)
{
	EState	   *estate;
	MemoryContext oldcontext;

	estate = node->ss.ps.state;

	oldcontext = MemoryContextSwitchTo(node->sss_SubEState->es_query_cxt);

	/*
	 * ExecReScan doesn't know about my subplan, so I have to do
	 * changed-parameter signaling myself.	This is just as well, because the
	 * subplan has its own memory context in which its chgParam state lives.
	 */
	if (node->ss.ps.chgParam != NULL)
		UpdateChangedParamSet(node->subplan, node->ss.ps.chgParam);

	/*
	 * if chgParam of subnode is not null then plan will be re-scanned by
	 * first ExecProcNode.
	 */
	if (node->subplan->chgParam == NULL)
		ExecReScan(node->subplan, NULL);

	MemoryContextSwitchTo(oldcontext);

	node->ss.ss_ScanTupleSlot = NULL;
	node->ss.ps.ps_TupFromTlist = false;
}
开发者ID:CraigBryan,项目名称:PostgresqlFun,代码行数:36,代码来源:nodeSubqueryscan.c


示例5: ExecReScanRecursiveUnion

/* ----------------------------------------------------------------
 *		ExecReScanRecursiveUnion
 *
 *		Rescans the relation.
 * ----------------------------------------------------------------
 */
void
ExecReScanRecursiveUnion(RecursiveUnionState *node)
{
	PlanState  *outerPlan = outerPlanState(node);
	PlanState  *innerPlan = innerPlanState(node);
	RecursiveUnion *plan = (RecursiveUnion *) node->ps.plan;

	/*
	 * Set recursive term's chgParam to tell it that we'll modify the working
	 * table and therefore it has to rescan.
	 */
	innerPlan->chgParam = bms_add_member(innerPlan->chgParam, plan->wtParam);

	/*
	 * if chgParam of subnode is not null then plan will be re-scanned by
	 * first ExecProcNode.	Because of above, we only have to do this to the
	 * non-recursive term.
	 */
	if (outerPlan->chgParam == NULL)
		ExecReScan(outerPlan);

	/* Release any hashtable storage */
	if (node->tableContext)
		MemoryContextResetAndDeleteChildren(node->tableContext);

	/* And rebuild empty hashtable if needed */
	if (plan->numCols > 0)
		build_hash_table(node);

	/* reset processing state */
	node->recursing = false;
	node->intermediate_empty = true;
	tuplestore_clear(node->working_table);
	tuplestore_clear(node->intermediate_table);
}
开发者ID:LittleForker,项目名称:postgres,代码行数:41,代码来源:nodeRecursiveunion.c


示例6: BitmapTableScanBeginPartition

/*
 * Prepares for scanning of a new partition/relation.
 */
void
BitmapTableScanBeginPartition(ScanState *node, bool initExpressions)
{
	Assert(node != NULL);
	BitmapTableScanState *scanState = (BitmapTableScanState *)node;

	Assert(SCAN_NEXT == scanState->ss.scan_state);

	initBitmapState(scanState);

	if (scanState->bitmapqualorig == NULL || initExpressions)
	{
		/* TODO rahmaf2 [JIRA: MPP-23293]: remap columns per-partition to handle dropped columns */
		scanState->bitmapqualorig = (List *)
			ExecInitExpr((Expr *) ((BitmapTableScan*)(node->ps.plan))->bitmapqualorig,
						 (PlanState *) scanState);
	}

	scanState->needNewBitmapPage = true;
	scanState->recheckTuples = true;

	getBitmapTableScanMethod(node->tableType)->beginScanMethod(node);

	/*
	 * Prepare child node to produce new bitmaps for the new partition (and cleanup
	 * any leftover state from old partition).
	 */
	ExecReScan(outerPlanState(node), NULL);
}
开发者ID:ictmalili,项目名称:incubator-hawq,代码行数:32,代码来源:execBitmapTableScan.c


示例7: ExecReScanAppend

void
ExecReScanAppend(AppendState *node, ExprContext *exprCtxt)
{
	int			i;

	for (i = node->as_firstplan; i <= node->as_lastplan; i++)
	{
		PlanState  *subnode = node->appendplans[i];

		/*
		 * ExecReScan doesn't know about my subplans, so I have to do
		 * changed-parameter signaling myself.
		 */
		if (node->ps.chgParam != NULL)
			UpdateChangedParamSet(subnode, node->ps.chgParam);

		/*
		 * if chgParam of subnode is not null then plan will be re-scanned
		 * by first ExecProcNode.
		 */
		if (subnode->chgParam == NULL)
		{
			/* make sure estate is correct for this subnode (needed??) */
			node->as_whichplan = i;
			exec_append_initialize_next(node);
			ExecReScan(subnode, exprCtxt);
		}
	}
	node->as_whichplan = node->as_firstplan;
	exec_append_initialize_next(node);
}
开发者ID:sunyangkobe,项目名称:cscd43,代码行数:31,代码来源:nodeAppend.c


示例8: BitmapTableScanReScan

/*
 * Prepares for a rescan.
 */
void
BitmapTableScanReScan(BitmapTableScanState *node, ExprContext *exprCtxt)
{
	ScanState *scanState = &node->ss;
	Assert(scanState->tableType >= 0 && scanState->tableType < TableTypeInvalid);

	/*
	 * If we are being passed an outer tuple, link it into the "regular"
	 * per-tuple econtext for possible qual eval.
	 */
	if (exprCtxt != NULL)
	{
		ExprContext *stdecontext = node->ss.ps.ps_ExprContext;
		stdecontext->ecxt_outertuple = exprCtxt->ecxt_outertuple;
	}

	EState	   *estate = node->ss.ps.state;
	Index scanrelid = ((Scan *)(scanState->ps.plan))->scanrelid;

	/* If this is re-scanning of PlanQual ... */
	if (estate->es_evTuple != NULL &&
		estate->es_evTuple[scanrelid - 1] != NULL)
	{
		estate->es_evTupleNull[scanrelid - 1] = false;
	}

	DynamicScan_ReScan((ScanState *)node, BitmapTableScanEndPartition, exprCtxt);

	ExecReScan(outerPlanState(node), exprCtxt);
}
开发者ID:ictmalili,项目名称:incubator-hawq,代码行数:33,代码来源:execBitmapTableScan.c


示例9: ExecReScanBitmapHeapScan

/* ----------------------------------------------------------------
 *		ExecReScanBitmapHeapScan(node)
 * ----------------------------------------------------------------
 */
void
ExecReScanBitmapHeapScan(BitmapHeapScanState *node)
{
	/* rescan to release any page pin */
	heap_rescan(node->ss.ss_currentScanDesc, NULL);

	if (node->tbmiterator)
		tbm_end_iterate(node->tbmiterator);
	if (node->prefetch_iterator)
		tbm_end_iterate(node->prefetch_iterator);
	if (node->tbm)
		tbm_free(node->tbm);
	node->tbm = NULL;
	node->tbmiterator = NULL;
	node->tbmres = NULL;
	node->prefetch_iterator = NULL;

	ExecScanReScan(&node->ss);

	/*
	 * if chgParam of subnode is not null then plan will be re-scanned by
	 * first ExecProcNode.
	 */
	if (node->ss.ps.lefttree->chgParam == NULL)
		ExecReScan(node->ss.ps.lefttree);
}
开发者ID:GisKook,项目名称:Gis,代码行数:30,代码来源:nodeBitmapHeapscan.c


示例10: ExecReScanAppend

void
ExecReScanAppend(AppendState *node, ExprContext *exprCtxt)
{
	int			i;

	for (i = node->as_firstplan; i <= node->as_lastplan; i++)
	{
		PlanState  *subnode = node->appendplans[i];

		/*
		 * ExecReScan doesn't know about my subplans, so I have to do
		 * changed-parameter signaling myself.
		 */
		if (node->ps.chgParam != NULL)
			UpdateChangedParamSet(subnode, node->ps.chgParam);

		/*
		 * If chgParam of subnode is not null then plan will be re-scanned by
		 * first ExecProcNode.	However, if caller is passing us an exprCtxt
		 * then forcibly rescan all the subnodes now, so that we can pass the
		 * exprCtxt down to the subnodes (needed for appendrel indexscan).
		 */
		if (subnode->chgParam == NULL || exprCtxt != NULL)
		{
			/* make sure estate is correct for this subnode (needed??) */
			node->as_whichplan = i;
			exec_append_initialize_next(node);
			ExecReScan(subnode, exprCtxt);
		}
	}
	node->as_whichplan = node->as_firstplan;
	exec_append_initialize_next(node);
}
开发者ID:KMU-embedded,项目名称:mosbench-ext,代码行数:33,代码来源:nodeAppend.c


示例11: ExecReScanSort

void
ExecReScanSort(SortState *node, ExprContext *exprCtxt)
{
	/*
	 * If we haven't sorted yet, just return. If outerplan' chgParam is not
	 * NULL then it will be re-scanned by ExecProcNode, else - no reason to
	 * re-scan it at all.
	 */
	if (!node->sort_Done)
		return;

	/* must drop pointer to sort result tuple */
	ExecClearTuple(node->ss.ps.ps_ResultTupleSlot);

	/*
	 * If subnode is to be rescanned then we forget previous sort results; we
	 * have to re-read the subplan and re-sort.
	 *
	 * Otherwise we can just rewind and rescan the sorted output.
	 */
	if (((PlanState *) node)->lefttree->chgParam != NULL ||
		!node->randomAccess ||
		(NULL == node->tuplesortstate->sortstore_mk && NULL == node->tuplesortstate->sortstore))
	{
		node->sort_Done = false;

		if (gp_enable_mk_sort && NULL != node->tuplesortstate->sortstore_mk)
		{
			tuplesort_end_mk(node->tuplesortstate->sortstore_mk);
		}

		if (!gp_enable_mk_sort && NULL != node->tuplesortstate->sortstore)
		{
			tuplesort_end(node->tuplesortstate->sortstore);
		}

		/*
		 * if chgParam of subnode is not null then plan will be re-scanned by
		 * first ExecProcNode.
		 */
		if (((PlanState *) node)->lefttree->chgParam == NULL)
		{
			ExecReScan(((PlanState *) node)->lefttree, exprCtxt);
		}
	}
	else
	{
		if(gp_enable_mk_sort)
		{
			tuplesort_rescan_mk(node->tuplesortstate->sortstore_mk);
		}
		else
		{
			tuplesort_rescan(node->tuplesortstate->sortstore);
		}
	}
}
开发者ID:huor,项目名称:gpdb,代码行数:57,代码来源:nodeSort.c


示例12: ExecReScanSetOp

void
ExecReScanSetOp(SetOpState *node)
{
	ExecClearTuple(node->ps.ps_ResultTupleSlot);
	node->setop_done = false;
	node->numOutput = 0;

	if (((SetOp *) node->ps.plan)->strategy == SETOP_HASHED)
	{
		/*
		 * In the hashed case, if we haven't yet built the hash table then we
		 * can just return; nothing done yet, so nothing to undo. If subnode's
		 * chgParam is not NULL then it will be re-scanned by ExecProcNode,
		 * else no reason to re-scan it at all.
		 */
		if (!node->table_filled)
			return;

		/*
		 * If we do have the hash table and the subplan does not have any
		 * parameter changes, then we can just rescan the existing hash table;
		 * no need to build it again.
		 */
		if (node->ps.lefttree->chgParam == NULL)
		{
			ResetTupleHashIterator(node->hashtable, &node->hashiter);
			return;
		}
	}

	/* Release first tuple of group, if we have made a copy */
	if (node->grp_firstTuple != NULL)
	{
		heap_freetuple(node->grp_firstTuple);
		node->grp_firstTuple = NULL;
	}

	/* Release any hashtable storage */
	if (node->tableContext)
		MemoryContextResetAndDeleteChildren(node->tableContext);

	/* And rebuild empty hashtable if needed */
	if (((SetOp *) node->ps.plan)->strategy == SETOP_HASHED)
	{
		build_hash_table(node);
		node->table_filled = false;
	}

	/*
	 * if chgParam of subnode is not null then plan will be re-scanned by
	 * first ExecProcNode.
	 */
	if (node->ps.lefttree->chgParam == NULL)
		ExecReScan(node->ps.lefttree);
}
开发者ID:BioBD,项目名称:Hypothetical_Indexes,代码行数:55,代码来源:nodeSetOp.c


示例13: ExecReScanGroup

void
ExecReScanGroup(GroupState *node, ExprContext *exprCtxt)
{
	node->grp_done = FALSE;
	/* must clear first tuple */
	ExecClearTuple(node->ss.ss_ScanTupleSlot);

	if (((PlanState *) node)->lefttree &&
		((PlanState *) node)->lefttree->chgParam == NULL)
		ExecReScan(((PlanState *) node)->lefttree, exprCtxt);
}
开发者ID:CraigBryan,项目名称:PostgresqlFun,代码行数:11,代码来源:nodeGroup.c


示例14: ExecBitmapTableReScan

/*
 * Prepares the BitmapTableScanState for a re-scan.
 */
void
ExecBitmapTableReScan(BitmapTableScanState *node, ExprContext *exprCtxt)
{
	BitmapTableScanReScan(node, exprCtxt);
	/*
	 * Always rescan the input immediately, to ensure we can pass down any
	 * outer tuple that might be used in index quals.
	 */
	CheckSendPlanStateGpmonPkt(&node->ss.ps);
	ExecReScan(outerPlanState(node), exprCtxt);
}
开发者ID:phan-pivotal,项目名称:gpdb,代码行数:14,代码来源:nodeBitmapTableScan.c


示例15: ExecReScanBitmapHeapScan

/* ----------------------------------------------------------------
 *		ExecReScanBitmapHeapScan(node)
 * ----------------------------------------------------------------
 */
void
ExecReScanBitmapHeapScan(BitmapHeapScanState *node)
{
	PlanState  *outerPlan = outerPlanState(node);

	/* rescan to release any page pin */
	heap_rescan(node->ss.ss_currentScanDesc, NULL);

	if (node->tbmiterator)
		tbm_end_iterate(node->tbmiterator);
	if (node->prefetch_iterator)
		tbm_end_iterate(node->prefetch_iterator);
	if (node->shared_tbmiterator)
		tbm_end_shared_iterate(node->shared_tbmiterator);
	if (node->shared_prefetch_iterator)
		tbm_end_shared_iterate(node->shared_prefetch_iterator);
	if (node->tbm)
		tbm_free(node->tbm);
	node->tbm = NULL;
	node->tbmiterator = NULL;
	node->tbmres = NULL;
	node->prefetch_iterator = NULL;
	node->initialized = false;
	node->shared_tbmiterator = NULL;
	node->shared_prefetch_iterator = NULL;

	/* Reset parallel bitmap state, if present */
	if (node->pstate)
	{
		dsa_area   *dsa = node->ss.ps.state->es_query_dsa;

		node->pstate->state = BM_INITIAL;

		if (DsaPointerIsValid(node->pstate->tbmiterator))
			tbm_free_shared_area(dsa, node->pstate->tbmiterator);

		if (DsaPointerIsValid(node->pstate->prefetch_iterator))
			tbm_free_shared_area(dsa, node->pstate->prefetch_iterator);

		node->pstate->tbmiterator = InvalidDsaPointer;
		node->pstate->prefetch_iterator = InvalidDsaPointer;
	}

	ExecScanReScan(&node->ss);

	/*
	 * if chgParam of subnode is not null then plan will be re-scanned by
	 * first ExecProcNode.
	 */
	if (outerPlan->chgParam == NULL)
		ExecReScan(outerPlan);
}
开发者ID:timmui,项目名称:postgres,代码行数:56,代码来源:nodeBitmapHeapscan.c


示例16: ExecIndexScan

/* ----------------------------------------------------------------
 *		ExecIndexScan(node)
 * ----------------------------------------------------------------
 */
TupleTableSlot *
ExecIndexScan(IndexScanState *node)
{
	/*
	 * If we have runtime keys and they've not already been set up, do it now.
	 */
	if (node->iss_NumRuntimeKeys != 0 && !node->iss_RuntimeKeysReady)
		ExecReScan((PlanState *) node);

	return ExecScan(&node->ss,
					(ExecScanAccessMtd) IndexNext,
					(ExecScanRecheckMtd) IndexRecheck);
}
开发者ID:aKhadiemik,项目名称:postgres,代码行数:17,代码来源:nodeIndexscan.c


示例17: ExecReScanLimit

void
ExecReScanLimit(LimitState *node, ExprContext *exprCtxt)
{
	/* resetting lstate will force offset/limit recalculation */
	node->lstate = LIMIT_INITIAL;

	/*
	 * if chgParam of subnode is not null then plan will be re-scanned by
	 * first ExecProcNode.
	 */
	if (((PlanState *) node)->lefttree->chgParam == NULL)
		ExecReScan(((PlanState *) node)->lefttree, exprCtxt);
}
开发者ID:454135329,项目名称:gpdb,代码行数:13,代码来源:nodeLimit.c


示例18: ExecReScanUnique

void
ExecReScanUnique(UniqueState *node)
{
	/* must clear result tuple so first input tuple is returned */
	ExecClearTuple(node->ps.ps_ResultTupleSlot);

	/*
	 * if chgParam of subnode is not null then plan will be re-scanned by
	 * first ExecProcNode.
	 */
	if (node->ps.lefttree->chgParam == NULL)
		ExecReScan(node->ps.lefttree);
}
开发者ID:csrajmohan,项目名称:PostgreSQL9.4_Fork,代码行数:13,代码来源:nodeUnique.c


示例19: ExecReScanResult

void
ExecReScanResult(ResultState *node)
{
	node->rs_done = false;
	node->rs_checkqual = (node->resconstantqual == NULL) ? false : true;

	/*
	 * If chgParam of subnode is not null then plan will be re-scanned by
	 * first ExecProcNode.
	 */
	if (node->ps.lefttree &&
		node->ps.lefttree->chgParam == NULL)
		ExecReScan(node->ps.lefttree);
}
开发者ID:alvherre,项目名称:postgres,代码行数:14,代码来源:nodeResult.c


示例20: ExecReScanGroup

void
ExecReScanGroup(GroupState *node, ExprContext *exprCtxt)
{
	node->grp_done = FALSE;
	if (node->grp_firstTuple != NULL)
	{
		heap_freetuple(node->grp_firstTuple);
		node->grp_firstTuple = NULL;
	}

	if (((PlanState *) node)->lefttree &&
		((PlanState *) node)->lefttree->chgParam == NULL)
		ExecReScan(((PlanState *) node)->lefttree, exprCtxt);
}
开发者ID:sunyangkobe,项目名称:cscd43,代码行数:14,代码来源:nodeGroup.c



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C++ ExecStoreTuple函数代码示例发布时间:2022-05-30
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