Exemplo n.º 1
0
/* ----------------------------------------------------------------
 *		ExecInitResult
 *
 *		Creates the run-time state information for the result node
 *		produced by the planner and initializes outer relations
 *		(child nodes).
 * ----------------------------------------------------------------
 */
ResultState *
ExecInitResult(Result *node, EState *estate, int eflags)
{
	ResultState *resstate;

	/* check for unsupported flags */
	Assert(!(eflags & (EXEC_FLAG_MARK | EXEC_FLAG_BACKWARD)) ||
		   outerPlan(node) != NULL);

	/*
	 * create state structure
	 */
	resstate = makeNode(ResultState);
	resstate->ps.plan = (Plan *) node;
	resstate->ps.state = estate;
	resstate->ps.ExecProcNode = ExecResult;

	resstate->rs_done = false;
	resstate->rs_checkqual = (node->resconstantqual == NULL) ? false : true;

	/*
	 * Miscellaneous initialization
	 *
	 * create expression context for node
	 */
	ExecAssignExprContext(estate, &resstate->ps);

	/*
	 * initialize child nodes
	 */
	outerPlanState(resstate) = ExecInitNode(outerPlan(node), estate, eflags);

	/*
	 * we don't use inner plan
	 */
	Assert(innerPlan(node) == NULL);

	/*
	 * Initialize result slot, type and projection.
	 */
	ExecInitResultTupleSlotTL(&resstate->ps);
	ExecAssignProjectionInfo(&resstate->ps, NULL);

	/*
	 * initialize child expressions
	 */
	resstate->ps.qual =
		ExecInitQual(node->plan.qual, (PlanState *) resstate);
	resstate->resconstantqual =
		ExecInitQual((List *) node->resconstantqual, (PlanState *) resstate);

	return resstate;
}
Exemplo n.º 2
0
/* -----------------
 * ExecInitGroup
 *
 *	Creates the run-time information for the group node produced by the
 *	planner and initializes its outer subtree
 * -----------------
 */
GroupState *
ExecInitGroup(Group *node, EState *estate, int eflags)
{
	GroupState *grpstate;

	/* check for unsupported flags */
	Assert(!(eflags & (EXEC_FLAG_BACKWARD | EXEC_FLAG_MARK)));

	/*
	 * create state structure
	 */
	grpstate = makeNode(GroupState);
	grpstate->ss.ps.plan = (Plan *) node;
	grpstate->ss.ps.state = estate;
	grpstate->ss.ps.ExecProcNode = ExecGroup;
	grpstate->grp_done = false;

	/*
	 * create expression context
	 */
	ExecAssignExprContext(estate, &grpstate->ss.ps);

	/*
	 * tuple table initialization
	 */
	ExecInitScanTupleSlot(estate, &grpstate->ss);
	ExecInitResultTupleSlot(estate, &grpstate->ss.ps);

	/*
	 * initialize child expressions
	 */
	grpstate->ss.ps.qual =
		ExecInitQual(node->plan.qual, (PlanState *) grpstate);

	/*
	 * initialize child nodes
	 */
	outerPlanState(grpstate) = ExecInitNode(outerPlan(node), estate, eflags);

	/*
	 * initialize tuple type.
	 */
	ExecAssignScanTypeFromOuterPlan(&grpstate->ss);

	/*
	 * Initialize result tuple type and projection info.
	 */
	ExecAssignResultTypeFromTL(&grpstate->ss.ps);
	ExecAssignProjectionInfo(&grpstate->ss.ps, NULL);

	/*
	 * Precompute fmgr lookup data for inner loop
	 */
	grpstate->eqfunctions =
		execTuplesMatchPrepare(node->numCols,
							   node->grpOperators);

	return grpstate;
}
Exemplo n.º 3
0
/* ----------------------------------------------------------------
 *		ExecInitWorkTableScan
 * ----------------------------------------------------------------
 */
WorkTableScanState *
ExecInitWorkTableScan(WorkTableScan *node, EState *estate, int eflags)
{
	WorkTableScanState *scanstate;

	/* check for unsupported flags */
	Assert(!(eflags & (EXEC_FLAG_BACKWARD | EXEC_FLAG_MARK)));

	/*
	 * WorkTableScan should not have any children.
	 */
	Assert(outerPlan(node) == NULL);
	Assert(innerPlan(node) == NULL);

	/*
	 * create new WorkTableScanState for node
	 */
	scanstate = makeNode(WorkTableScanState);
	scanstate->ss.ps.plan = (Plan *) node;
	scanstate->ss.ps.state = estate;
	scanstate->ss.ps.ExecProcNode = ExecWorkTableScan;
	scanstate->rustate = NULL;	/* we'll set this later */

	/*
	 * Miscellaneous initialization
	 *
	 * create expression context for node
	 */
	ExecAssignExprContext(estate, &scanstate->ss.ps);

	/*
	 * tuple table initialization
	 */
	ExecInitResultTypeTL(&scanstate->ss.ps);

	/* signal that return type is not yet known */
	scanstate->ss.ps.resultopsset = true;
	scanstate->ss.ps.resultopsfixed = false;

	ExecInitScanTupleSlot(estate, &scanstate->ss, NULL, &TTSOpsMinimalTuple);

	/*
	 * initialize child expressions
	 */
	scanstate->ss.ps.qual =
		ExecInitQual(node->scan.plan.qual, (PlanState *) scanstate);

	/*
	 * Do not yet initialize projection info, see ExecWorkTableScan() for
	 * details.
	 */

	return scanstate;
}
Exemplo n.º 4
0
/* ----------------------------------------------------------------
 *		ExecInitSeqScan
 * ----------------------------------------------------------------
 */
SeqScanState *
ExecInitSeqScan(SeqScan *node, EState *estate, int eflags)
{
	SeqScanState *scanstate;

	/*
	 * Once upon a time it was possible to have an outerPlan of a SeqScan, but
	 * not any more.
	 */
	Assert(outerPlan(node) == NULL);
	Assert(innerPlan(node) == NULL);

	/*
	 * create state structure
	 */
	scanstate = makeNode(SeqScanState);
	scanstate->ss.ps.plan = (Plan *) node;
	scanstate->ss.ps.state = estate;
	scanstate->ss.ps.ExecProcNode = ExecSeqScan;

	/*
	 * Miscellaneous initialization
	 *
	 * create expression context for node
	 */
	ExecAssignExprContext(estate, &scanstate->ss.ps);

	/*
	 * initialize child expressions
	 */
	scanstate->ss.ps.qual =
		ExecInitQual(node->plan.qual, (PlanState *) scanstate);

	/*
	 * tuple table initialization
	 */
	ExecInitResultTupleSlot(estate, &scanstate->ss.ps);
	ExecInitScanTupleSlot(estate, &scanstate->ss);

	/*
	 * initialize scan relation
	 */
	InitScanRelation(scanstate, estate, eflags);

	/*
	 * Initialize result tuple type and projection info.
	 */
	ExecAssignResultTypeFromTL(&scanstate->ss.ps);
	ExecAssignScanProjectionInfo(&scanstate->ss);

	return scanstate;
}
Exemplo n.º 5
0
/* ----------------------------------------------------------------
 *		ExecInitHash
 *
 *		Init routine for Hash node
 * ----------------------------------------------------------------
 */
HashState *
ExecInitHash(Hash *node, EState *estate, int eflags)
{
	HashState  *hashstate;

	/* check for unsupported flags */
	Assert(!(eflags & (EXEC_FLAG_BACKWARD | EXEC_FLAG_MARK)));

	/*
	 * create state structure
	 */
	hashstate = makeNode(HashState);
	hashstate->ps.plan = (Plan *) node;
	hashstate->ps.state = estate;
	hashstate->ps.ExecProcNode = ExecHash;
	hashstate->hashtable = NULL;
	hashstate->hashkeys = NIL;	/* will be set by parent HashJoin */

	/*
	 * Miscellaneous initialization
	 *
	 * create expression context for node
	 */
	ExecAssignExprContext(estate, &hashstate->ps);

	/*
	 * initialize our result slot
	 */
	ExecInitResultTupleSlot(estate, &hashstate->ps);

	/*
	 * initialize child expressions
	 */
	hashstate->ps.qual =
		ExecInitQual(node->plan.qual, (PlanState *) hashstate);

	/*
	 * initialize child nodes
	 */
	outerPlanState(hashstate) = ExecInitNode(outerPlan(node), estate, eflags);

	/*
	 * initialize tuple type. no need to initialize projection info because
	 * this node doesn't do projections
	 */
	ExecAssignResultTypeFromTL(&hashstate->ps);
	hashstate->ps.ps_ProjInfo = NULL;

	return hashstate;
}
Exemplo n.º 6
0
/* ----------------------------------------------------------------
 *		ExecInitIndexOnlyScan
 *
 *		Initializes the index scan's state information, creates
 *		scan keys, and opens the base and index relations.
 *
 *		Note: index scans have 2 sets of state information because
 *			  we have to keep track of the base relation and the
 *			  index relation.
 * ----------------------------------------------------------------
 */
IndexOnlyScanState *
ExecInitIndexOnlyScan(IndexOnlyScan *node, EState *estate, int eflags)
{
	IndexOnlyScanState *indexstate;
	Relation	currentRelation;
	bool		relistarget;
	TupleDesc	tupDesc;

	/*
	 * create state structure
	 */
	indexstate = makeNode(IndexOnlyScanState);
	indexstate->ss.ps.plan = (Plan *) node;
	indexstate->ss.ps.state = estate;
	indexstate->ss.ps.ExecProcNode = ExecIndexOnlyScan;

	/*
	 * Miscellaneous initialization
	 *
	 * create expression context for node
	 */
	ExecAssignExprContext(estate, &indexstate->ss.ps);

	/*
	 * open the scan relation
	 */
	currentRelation = ExecOpenScanRelation(estate, node->scan.scanrelid, eflags);

	indexstate->ss.ss_currentRelation = currentRelation;
	indexstate->ss.ss_currentScanDesc = NULL;	/* no heap scan here */

	/*
	 * Build the scan tuple type using the indextlist generated by the
	 * planner.  We use this, rather than the index's physical tuple
	 * descriptor, because the latter contains storage column types not the
	 * types of the original datums.  (It's the AM's responsibility to return
	 * suitable data anyway.)
	 */
	tupDesc = ExecTypeFromTL(node->indextlist);
	ExecInitScanTupleSlot(estate, &indexstate->ss, tupDesc, &TTSOpsHeapTuple);

	/*
	 * Initialize result type and projection info.  The node's targetlist will
	 * contain Vars with varno = INDEX_VAR, referencing the scan tuple.
	 */
	ExecInitResultTypeTL(&indexstate->ss.ps);
	ExecAssignScanProjectionInfoWithVarno(&indexstate->ss, INDEX_VAR);

	/*
	 * initialize child expressions
	 *
	 * Note: we don't initialize all of the indexorderby expression, only the
	 * sub-parts corresponding to runtime keys (see below).
	 */
	indexstate->ss.ps.qual =
		ExecInitQual(node->scan.plan.qual, (PlanState *) indexstate);
	indexstate->indexqual =
		ExecInitQual(node->indexqual, (PlanState *) indexstate);

	/*
	 * If we are just doing EXPLAIN (ie, aren't going to run the plan), stop
	 * here.  This allows an index-advisor plugin to EXPLAIN a plan containing
	 * references to nonexistent indexes.
	 */
	if (eflags & EXEC_FLAG_EXPLAIN_ONLY)
		return indexstate;

	/*
	 * Open the index relation.
	 *
	 * If the parent table is one of the target relations of the query, then
	 * InitPlan already opened and write-locked the index, so we can avoid
	 * taking another lock here.  Otherwise we need a normal reader's lock.
	 */
	relistarget = ExecRelationIsTargetRelation(estate, node->scan.scanrelid);
	indexstate->ioss_RelationDesc = index_open(node->indexid,
											   relistarget ? NoLock : AccessShareLock);

	/*
	 * Initialize index-specific scan state
	 */
	indexstate->ioss_RuntimeKeysReady = false;
	indexstate->ioss_RuntimeKeys = NULL;
	indexstate->ioss_NumRuntimeKeys = 0;

	/*
	 * build the index scan keys from the index qualification
	 */
	ExecIndexBuildScanKeys((PlanState *) indexstate,
						   indexstate->ioss_RelationDesc,
						   node->indexqual,
						   false,
						   &indexstate->ioss_ScanKeys,
						   &indexstate->ioss_NumScanKeys,
						   &indexstate->ioss_RuntimeKeys,
						   &indexstate->ioss_NumRuntimeKeys,
						   NULL,	/* no ArrayKeys */
						   NULL);

	/*
	 * any ORDER BY exprs have to be turned into scankeys in the same way
	 */
	ExecIndexBuildScanKeys((PlanState *) indexstate,
						   indexstate->ioss_RelationDesc,
						   node->indexorderby,
						   true,
						   &indexstate->ioss_OrderByKeys,
						   &indexstate->ioss_NumOrderByKeys,
						   &indexstate->ioss_RuntimeKeys,
						   &indexstate->ioss_NumRuntimeKeys,
						   NULL,	/* no ArrayKeys */
						   NULL);

	/*
	 * If we have runtime keys, we need an ExprContext to evaluate them. The
	 * node's standard context won't do because we want to reset that context
	 * for every tuple.  So, build another context just like the other one...
	 * -tgl 7/11/00
	 */
	if (indexstate->ioss_NumRuntimeKeys != 0)
	{
		ExprContext *stdecontext = indexstate->ss.ps.ps_ExprContext;

		ExecAssignExprContext(estate, &indexstate->ss.ps);
		indexstate->ioss_RuntimeContext = indexstate->ss.ps.ps_ExprContext;
		indexstate->ss.ps.ps_ExprContext = stdecontext;
	}
	else
	{
		indexstate->ioss_RuntimeContext = NULL;
	}

	/*
	 * all done.
	 */
	return indexstate;
}
Exemplo n.º 7
0
/* ----------------------------------------------------------------
 *		ExecInitCteScan
 * ----------------------------------------------------------------
 */
CteScanState *
ExecInitCteScan(CteScan *node, EState *estate, int eflags)
{
	CteScanState *scanstate;
	ParamExecData *prmdata;

	/* check for unsupported flags */
	Assert(!(eflags & EXEC_FLAG_MARK));

	/*
	 * For the moment we have to force the tuplestore to allow REWIND, because
	 * we might be asked to rescan the CTE even though upper levels didn't
	 * tell us to be prepared to do it efficiently.  Annoying, since this
	 * prevents truncation of the tuplestore.  XXX FIXME
	 *
	 * Note: if we are in an EPQ recheck plan tree, it's likely that no access
	 * to the tuplestore is needed at all, making this even more annoying.
	 * It's not worth improving that as long as all the read pointers would
	 * have REWIND anyway, but if we ever improve this logic then that aspect
	 * should be considered too.
	 */
	eflags |= EXEC_FLAG_REWIND;

	/*
	 * CteScan should not have any children.
	 */
	Assert(outerPlan(node) == NULL);
	Assert(innerPlan(node) == NULL);

	/*
	 * create new CteScanState for node
	 */
	scanstate = makeNode(CteScanState);
	scanstate->ss.ps.plan = (Plan *) node;
	scanstate->ss.ps.state = estate;
	scanstate->ss.ps.ExecProcNode = ExecCteScan;
	scanstate->eflags = eflags;
	scanstate->cte_table = NULL;
	scanstate->eof_cte = false;

	/*
	 * Find the already-initialized plan for the CTE query.
	 */
	scanstate->cteplanstate = (PlanState *) list_nth(estate->es_subplanstates,
													 node->ctePlanId - 1);

	/*
	 * The Param slot associated with the CTE query is used to hold a pointer
	 * to the CteState of the first CteScan node that initializes for this
	 * CTE.  This node will be the one that holds the shared state for all the
	 * CTEs, particularly the shared tuplestore.
	 */
	prmdata = &(estate->es_param_exec_vals[node->cteParam]);
	Assert(prmdata->execPlan == NULL);
	Assert(!prmdata->isnull);
	scanstate->leader = castNode(CteScanState, DatumGetPointer(prmdata->value));
	if (scanstate->leader == NULL)
	{
		/* I am the leader */
		prmdata->value = PointerGetDatum(scanstate);
		scanstate->leader = scanstate;
		scanstate->cte_table = tuplestore_begin_heap(true, false, work_mem);
		tuplestore_set_eflags(scanstate->cte_table, scanstate->eflags);
		scanstate->readptr = 0;
	}
	else
	{
		/* Not the leader */
		/* Create my own read pointer, and ensure it is at start */
		scanstate->readptr =
			tuplestore_alloc_read_pointer(scanstate->leader->cte_table,
										  scanstate->eflags);
		tuplestore_select_read_pointer(scanstate->leader->cte_table,
									   scanstate->readptr);
		tuplestore_rescan(scanstate->leader->cte_table);
	}

	/*
	 * Miscellaneous initialization
	 *
	 * create expression context for node
	 */
	ExecAssignExprContext(estate, &scanstate->ss.ps);

	/*
	 * The scan tuple type (ie, the rowtype we expect to find in the work
	 * table) is the same as the result rowtype of the CTE query.
	 */
	ExecInitScanTupleSlot(estate, &scanstate->ss,
						  ExecGetResultType(scanstate->cteplanstate),
						  &TTSOpsMinimalTuple);

	/*
	 * Initialize result type and projection.
	 */
	ExecInitResultTypeTL(&scanstate->ss.ps);
	ExecAssignScanProjectionInfo(&scanstate->ss);

	/*
	 * initialize child expressions
	 */
	scanstate->ss.ps.qual =
		ExecInitQual(node->scan.plan.qual, (PlanState *) scanstate);

	return scanstate;
}
Exemplo n.º 8
0
/* ----------------------------------------------------------------
 *		ExecInitSubqueryScan
 * ----------------------------------------------------------------
 */
SubqueryScanState *
ExecInitSubqueryScan(SubqueryScan *node, EState *estate, int eflags)
{
	SubqueryScanState *subquerystate;

	/* check for unsupported flags */
	Assert(!(eflags & EXEC_FLAG_MARK));

	/* SubqueryScan should not have any "normal" children */
	Assert(outerPlan(node) == NULL);
	Assert(innerPlan(node) == NULL);

	/*
	 * create state structure
	 */
	subquerystate = makeNode(SubqueryScanState);
	subquerystate->ss.ps.plan = (Plan *) node;
	subquerystate->ss.ps.state = estate;
	subquerystate->ss.ps.ExecProcNode = ExecSubqueryScan;

	/*
	 * Miscellaneous initialization
	 *
	 * create expression context for node
	 */
	ExecAssignExprContext(estate, &subquerystate->ss.ps);

	/*
	 * initialize subquery
	 */
	subquerystate->subplan = ExecInitNode(node->subplan, estate, eflags);

	/*
	 * Initialize scan slot and type (needed by ExecAssignScanProjectionInfo)
	 */
	ExecInitScanTupleSlot(estate, &subquerystate->ss,
						  ExecGetResultType(subquerystate->subplan),
						  ExecGetResultSlotOps(subquerystate->subplan, NULL));
	/*
	 * The slot used as the scantuple isn't the slot above (outside of EPQ),
	 * but the one from the node below.
	 */
	subquerystate->ss.ps.scanopsset = true;
	subquerystate->ss.ps.scanops = ExecGetResultSlotOps(subquerystate->subplan,
														&subquerystate->ss.ps.scanopsfixed);
	subquerystate->ss.ps.resultopsset = true;
	subquerystate->ss.ps.resultops = subquerystate->ss.ps.scanops;
	subquerystate->ss.ps.resultopsfixed = subquerystate->ss.ps.scanopsfixed;

	/*
	 * Initialize result type and projection.
	 */
	ExecInitResultTypeTL(&subquerystate->ss.ps);
	ExecAssignScanProjectionInfo(&subquerystate->ss);

	/*
	 * initialize child expressions
	 */
	subquerystate->ss.ps.qual =
		ExecInitQual(node->scan.plan.qual, (PlanState *) subquerystate);

	return subquerystate;
}
Exemplo n.º 9
0
/* ----------------------------------------------------------------
 *		ExecInitBitmapHeapScan
 *
 *		Initializes the scan's state information.
 * ----------------------------------------------------------------
 */
BitmapHeapScanState *
ExecInitBitmapHeapScan(BitmapHeapScan *node, EState *estate, int eflags)
{
	BitmapHeapScanState *scanstate;
	Relation	currentRelation;
	int			io_concurrency;

	/* check for unsupported flags */
	Assert(!(eflags & (EXEC_FLAG_BACKWARD | EXEC_FLAG_MARK)));

	/*
	 * Assert caller didn't ask for an unsafe snapshot --- see comments at
	 * head of file.
	 */
	Assert(IsMVCCSnapshot(estate->es_snapshot));

	/*
	 * create state structure
	 */
	scanstate = makeNode(BitmapHeapScanState);
	scanstate->ss.ps.plan = (Plan *) node;
	scanstate->ss.ps.state = estate;
	scanstate->ss.ps.ExecProcNode = ExecBitmapHeapScan;

	scanstate->tbm = NULL;
	scanstate->tbmiterator = NULL;
	scanstate->tbmres = NULL;
	scanstate->exact_pages = 0;
	scanstate->lossy_pages = 0;
	scanstate->prefetch_iterator = NULL;
	scanstate->prefetch_pages = 0;
	scanstate->prefetch_target = 0;
	/* may be updated below */
	scanstate->prefetch_maximum = target_prefetch_pages;
	scanstate->pscan_len = 0;
	scanstate->initialized = false;
	scanstate->shared_tbmiterator = NULL;
	scanstate->pstate = NULL;

	/*
	 * Miscellaneous initialization
	 *
	 * create expression context for node
	 */
	ExecAssignExprContext(estate, &scanstate->ss.ps);

	/*
	 * initialize child expressions
	 */
	scanstate->ss.ps.qual =
		ExecInitQual(node->scan.plan.qual, (PlanState *) scanstate);
	scanstate->bitmapqualorig =
		ExecInitQual(node->bitmapqualorig, (PlanState *) scanstate);

	/*
	 * tuple table initialization
	 */
	ExecInitResultTupleSlot(estate, &scanstate->ss.ps);
	ExecInitScanTupleSlot(estate, &scanstate->ss);

	/*
	 * open the base relation and acquire appropriate lock on it.
	 */
	currentRelation = ExecOpenScanRelation(estate, node->scan.scanrelid, eflags);

	/*
	 * Determine the maximum for prefetch_target.  If the tablespace has a
	 * specific IO concurrency set, use that to compute the corresponding
	 * maximum value; otherwise, we already initialized to the value computed
	 * by the GUC machinery.
	 */
	io_concurrency =
		get_tablespace_io_concurrency(currentRelation->rd_rel->reltablespace);
	if (io_concurrency != effective_io_concurrency)
	{
		double		maximum;

		if (ComputeIoConcurrency(io_concurrency, &maximum))
			scanstate->prefetch_maximum = rint(maximum);
	}

	scanstate->ss.ss_currentRelation = currentRelation;

	/*
	 * Even though we aren't going to do a conventional seqscan, it is useful
	 * to create a HeapScanDesc --- most of the fields in it are usable.
	 */
	scanstate->ss.ss_currentScanDesc = heap_beginscan_bm(currentRelation,
														 estate->es_snapshot,
														 0,
														 NULL);

	/*
	 * get the scan type from the relation descriptor.
	 */
	ExecAssignScanType(&scanstate->ss, RelationGetDescr(currentRelation));

	/*
	 * Initialize result tuple type and projection info.
	 */
	ExecAssignResultTypeFromTL(&scanstate->ss.ps);
	ExecAssignScanProjectionInfo(&scanstate->ss);

	/*
	 * initialize child nodes
	 *
	 * We do this last because the child nodes will open indexscans on our
	 * relation's indexes, and we want to be sure we have acquired a lock on
	 * the relation first.
	 */
	outerPlanState(scanstate) = ExecInitNode(outerPlan(node), estate, eflags);

	/*
	 * all done.
	 */
	return scanstate;
}
Exemplo n.º 10
0
/* ----------------------------------------------------------------
 *		ExecInitGather
 * ----------------------------------------------------------------
 */
GatherMergeState *
ExecInitGatherMerge(GatherMerge *node, EState *estate, int eflags)
{
	GatherMergeState *gm_state;
	Plan	   *outerNode;
	bool		hasoid;
	TupleDesc	tupDesc;

	/* Gather merge node doesn't have innerPlan node. */
	Assert(innerPlan(node) == NULL);

	/*
	 * create state structure
	 */
	gm_state = makeNode(GatherMergeState);
	gm_state->ps.plan = (Plan *) node;
	gm_state->ps.state = estate;
	gm_state->ps.ExecProcNode = ExecGatherMerge;

	/*
	 * Miscellaneous initialization
	 *
	 * create expression context for node
	 */
	ExecAssignExprContext(estate, &gm_state->ps);

	/*
	 * initialize child expressions
	 */
	gm_state->ps.qual =
		ExecInitQual(node->plan.qual, &gm_state->ps);

	/*
	 * tuple table initialization
	 */
	ExecInitResultTupleSlot(estate, &gm_state->ps);

	/*
	 * now initialize outer plan
	 */
	outerNode = outerPlan(node);
	outerPlanState(gm_state) = ExecInitNode(outerNode, estate, eflags);

	/*
	 * Initialize result tuple type and projection info.
	 */
	ExecAssignResultTypeFromTL(&gm_state->ps);
	ExecAssignProjectionInfo(&gm_state->ps, NULL);

	gm_state->gm_initialized = false;

	/*
	 * initialize sort-key information
	 */
	if (node->numCols)
	{
		int			i;

		gm_state->gm_nkeys = node->numCols;
		gm_state->gm_sortkeys =
			palloc0(sizeof(SortSupportData) * node->numCols);

		for (i = 0; i < node->numCols; i++)
		{
			SortSupport sortKey = gm_state->gm_sortkeys + i;

			sortKey->ssup_cxt = CurrentMemoryContext;
			sortKey->ssup_collation = node->collations[i];
			sortKey->ssup_nulls_first = node->nullsFirst[i];
			sortKey->ssup_attno = node->sortColIdx[i];

			/*
			 * We don't perform abbreviated key conversion here, for the same
			 * reasons that it isn't used in MergeAppend
			 */
			sortKey->abbreviate = false;

			PrepareSortSupportFromOrderingOp(node->sortOperators[i], sortKey);
		}
	}

	/*
	 * store the tuple descriptor into gather merge state, so we can use it
	 * later while initializing the gather merge slots.
	 */
	if (!ExecContextForcesOids(&gm_state->ps, &hasoid))
		hasoid = false;
	tupDesc = ExecTypeFromTL(outerNode->targetlist, hasoid);
	gm_state->tupDesc = tupDesc;

	return gm_state;
}
Exemplo n.º 11
0
/* ----------------------------------------------------------------
 *		ExecInitBitmapHeapScan
 *
 *		Initializes the scan's state information.
 * ----------------------------------------------------------------
 */
BitmapHeapScanState *
ExecInitBitmapHeapScan(BitmapHeapScan *node, EState *estate, int eflags)
{
	BitmapHeapScanState *scanstate;
	Relation	currentRelation;
	int			io_concurrency;

	/* check for unsupported flags */
	Assert(!(eflags & (EXEC_FLAG_BACKWARD | EXEC_FLAG_MARK)));

	/*
	 * Assert caller didn't ask for an unsafe snapshot --- see comments at
	 * head of file.
	 */
	Assert(IsMVCCSnapshot(estate->es_snapshot));

	/*
	 * create state structure
	 */
	scanstate = makeNode(BitmapHeapScanState);
	scanstate->ss.ps.plan = (Plan *) node;
	scanstate->ss.ps.state = estate;
	scanstate->ss.ps.ExecProcNode = ExecBitmapHeapScan;

	scanstate->tbm = NULL;
	scanstate->tbmiterator = NULL;
	scanstate->tbmres = NULL;
	scanstate->skip_fetch = false;
	scanstate->vmbuffer = InvalidBuffer;
	scanstate->pvmbuffer = InvalidBuffer;
	scanstate->exact_pages = 0;
	scanstate->lossy_pages = 0;
	scanstate->prefetch_iterator = NULL;
	scanstate->prefetch_pages = 0;
	scanstate->prefetch_target = 0;
	/* may be updated below */
	scanstate->prefetch_maximum = target_prefetch_pages;
	scanstate->pscan_len = 0;
	scanstate->initialized = false;
	scanstate->shared_tbmiterator = NULL;
	scanstate->shared_prefetch_iterator = NULL;
	scanstate->pstate = NULL;

	/*
	 * We can potentially skip fetching heap pages if we do not need any
	 * columns of the table, either for checking non-indexable quals or for
	 * returning data.  This test is a bit simplistic, as it checks the
	 * stronger condition that there's no qual or return tlist at all.  But in
	 * most cases it's probably not worth working harder than that.
	 */
	scanstate->can_skip_fetch = (node->scan.plan.qual == NIL &&
								 node->scan.plan.targetlist == NIL);

	/*
	 * Miscellaneous initialization
	 *
	 * create expression context for node
	 */
	ExecAssignExprContext(estate, &scanstate->ss.ps);

	/*
	 * open the scan relation
	 */
	currentRelation = ExecOpenScanRelation(estate, node->scan.scanrelid, eflags);

	/*
	 * initialize child nodes
	 */
	outerPlanState(scanstate) = ExecInitNode(outerPlan(node), estate, eflags);

	/*
	 * get the scan type from the relation descriptor.
	 */
	ExecInitScanTupleSlot(estate, &scanstate->ss,
						  RelationGetDescr(currentRelation),
						  &TTSOpsBufferHeapTuple);


	/*
	 * Initialize result type and projection.
	 */
	ExecInitResultTypeTL(&scanstate->ss.ps);
	ExecAssignScanProjectionInfo(&scanstate->ss);

	/*
	 * initialize child expressions
	 */
	scanstate->ss.ps.qual =
		ExecInitQual(node->scan.plan.qual, (PlanState *) scanstate);
	scanstate->bitmapqualorig =
		ExecInitQual(node->bitmapqualorig, (PlanState *) scanstate);

	/*
	 * Determine the maximum for prefetch_target.  If the tablespace has a
	 * specific IO concurrency set, use that to compute the corresponding
	 * maximum value; otherwise, we already initialized to the value computed
	 * by the GUC machinery.
	 */
	io_concurrency =
		get_tablespace_io_concurrency(currentRelation->rd_rel->reltablespace);
	if (io_concurrency != effective_io_concurrency)
	{
		double		maximum;

		if (ComputeIoConcurrency(io_concurrency, &maximum))
			scanstate->prefetch_maximum = rint(maximum);
	}

	scanstate->ss.ss_currentRelation = currentRelation;

	/*
	 * Even though we aren't going to do a conventional seqscan, it is useful
	 * to create a HeapScanDesc --- most of the fields in it are usable.
	 */
	scanstate->ss.ss_currentScanDesc = heap_beginscan_bm(currentRelation,
														 estate->es_snapshot,
														 0,
														 NULL);

	/*
	 * all done.
	 */
	return scanstate;
}