Beispiel #1
0
/* ----------------------------------------------------------------
 *		ExecInitUnique
 *
 *		This initializes the unique node state structures and
 *		the node's subplan.
 * ----------------------------------------------------------------
 */
UniqueState *
ExecInitUnique(Unique *node, EState *estate, int eflags)
{
	UniqueState *uniquestate;

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

	/*
	 * create state structure
	 */
	uniquestate = makeNode(UniqueState);
	uniquestate->ps.plan = (Plan *) node;
	uniquestate->ps.state = estate;

	/*
	 * Miscellaneous initialization
	 *
	 * Unique nodes have no ExprContext initialization because they never call
	 * ExecQual or ExecProject.  But they do need a per-tuple memory context
	 * anyway for calling execTuplesMatch.
	 */
	uniquestate->tempContext =
		AllocSetContextCreate(CurrentMemoryContext,
							  "Unique",
							  ALLOCSET_DEFAULT_MINSIZE,
							  ALLOCSET_DEFAULT_INITSIZE,
							  ALLOCSET_DEFAULT_MAXSIZE);

#define UNIQUE_NSLOTS 1

	/*
	 * Tuple table initialization
	 */
	ExecInitResultTupleSlot(estate, &uniquestate->ps);

	/*
	 * then initialize outer plan
	 */
	outerPlanState(uniquestate) = ExecInitNode(outerPlan(node), estate, eflags);

	/*
	 * unique nodes do no projections, so initialize projection info for this
	 * node appropriately
	 */
	ExecAssignResultTypeFromTL(&uniquestate->ps);
	uniquestate->ps.ps_ProjInfo = NULL;

	/*
	 * Precompute fmgr lookup data for inner loop
	 */
	uniquestate->eqfunctions =
		execTuplesMatchPrepare(ExecGetResultType(&uniquestate->ps),
							   node->numCols,
							   node->uniqColIdx);

	initGpmonPktForUnique((Plan *)node, &uniquestate->ps.gpmon_pkt, estate);
	
	return uniquestate;
}
/* ----------------------------------------------------------------
 *		ExecInitWorkTableScan
 * ----------------------------------------------------------------
 */
WorkTableScanState *
ExecInitWorkTableScan(WorkTableScan *node, EState *estate, int eflags)
{
	WorkTableScanState *scanstate;

	/* check for unsupported flags */
	/*
	 * GPDB_84_MERGE_FIXME: Make sure we don't require EXEC_FLAG_BACKWARD
	 * in GPDB.
	 */
	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->rustate = NULL;	/* we'll set this later */

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

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

#define WORKTABLESCAN_NSLOTS 2

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

	/*
	 * Initialize result tuple type, but not yet projection info.
	 */
	ExecAssignResultTypeFromTL(&scanstate->ss.ps);

	/* scanstate->ss.ps.ps_TupFromTlist = false; */

	return scanstate;
}
Beispiel #3
0
/* ----------------------------------------------------------------
 *		ExecInitSeqScan
 * ----------------------------------------------------------------
 */
SeqScanState *
ExecInitSeqScan(SeqScan *node, EState *estate, int eflags)
{
	SeqScanState *scanstate;
	AttrNumber ctid_attrno;

	/*
	 * 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->ps.plan = (Plan *) node;
	scanstate->ps.state = estate;

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

	/*
	 * initialize child expressions
	 */
	scanstate->ps.targetlist = (List *)
		ExecInitExpr((Expr *) node->plan.targetlist,
					 (PlanState *) scanstate);
	scanstate->ps.qual = (List *)
		ExecInitExpr((Expr *) node->plan.qual,
					 (PlanState *) scanstate);

#define SEQSCAN_NSLOTS 2

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

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

	scanstate->ps.ps_TupFromTlist = false;

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

	return scanstate;
}
/* ----------------------------------------------------------------
 *		ExecInitAppendOnlyScan
 * ----------------------------------------------------------------
 */
AppendOnlyScanState *
ExecInitAppendOnlyScan(AppendOnlyScan *node, EState *estate, int eflags)
{
	AppendOnlyScanState	*appendonlystate;
	Relation			currentRelation;
	
	Assert(outerPlan(node) == NULL);
	Assert(innerPlan(node) == NULL);

	/*
	 * create state structure
	 */
	appendonlystate = makeNode(AppendOnlyScanState);
	appendonlystate->ss.ps.plan = (Plan *) node;
	appendonlystate->ss.ps.state = estate;

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

	/*
	 * initialize child expressions
	 */
	appendonlystate->ss.ps.targetlist = (List *)
		ExecInitExpr((Expr *) node->scan.plan.targetlist,
					 (PlanState *) appendonlystate);
	appendonlystate->ss.ps.qual = (List *)
		ExecInitExpr((Expr *) node->scan.plan.qual,
					 (PlanState *) appendonlystate);

#define AOSCAN_NSLOTS 2

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

	/*
	 * get the relation object id from the relid'th entry in the range table
	 * and open that relation.
	 */
	currentRelation = ExecOpenScanRelation(estate, node->scan.scanrelid);	
	appendonlystate->ss.ss_currentRelation = currentRelation;
	ExecAssignScanType(&appendonlystate->ss, RelationGetDescr(currentRelation));
	
	/*
	 * Initialize result tuple type and projection info.
	 */
	ExecAssignResultTypeFromTL(&appendonlystate->ss.ps);
	ExecAssignScanProjectionInfo(&appendonlystate->ss);

	initGpmonPktForAppendOnlyScan((Plan *)node, &appendonlystate->ss.ps.gpmon_pkt, estate);

	return appendonlystate;
}
/* ----------------------------------------------------------------
 *		ExecInitResult
 *
 *		Creates the run-time state information for the result node
 *		produced by the planner and initailizes outer relations
 *		(child nodes).
 * ----------------------------------------------------------------
 */
ResultState *
ExecInitResult(Result *node, EState *estate)
{
	ResultState *resstate;

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

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

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

#define RESULT_NSLOTS 1

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

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

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

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

	/*
	 * initialize tuple type and projection info
	 */
	ExecAssignResultTypeFromTL(&resstate->ps);
	ExecAssignProjectionInfo(&resstate->ps);

	return resstate;
}
Beispiel #6
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;
}
Beispiel #7
0
/* ----------------------------------------------------------------
 *		ExecInitLimit
 *
 *		This initializes the limit node state structures and
 *		the node's subplan.
 * ----------------------------------------------------------------
 */
LimitState *
ExecInitLimit(Limit *node, EState *estate, int eflags)
{
	LimitState *limitstate;
	Plan	   *outerPlan;

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

	/*
	 * create state structure
	 */
	limitstate = makeNode(LimitState);
	limitstate->ps.plan = (Plan *) node;
	limitstate->ps.state = estate;

	limitstate->lstate = LIMIT_INITIAL;

	/*
	 * Miscellaneous initialization
	 *
	 * Limit nodes never call ExecQual or ExecProject, but they need an
	 * exprcontext anyway to evaluate the limit/offset parameters in.
	 */
	ExecAssignExprContext(estate, &limitstate->ps);

	/*
	 * initialize child expressions
	 */
	limitstate->limitOffset = ExecInitExpr((Expr *) node->limitOffset,
										   (PlanState *) limitstate);
	limitstate->limitCount = ExecInitExpr((Expr *) node->limitCount,
										  (PlanState *) limitstate);

#define LIMIT_NSLOTS 1

	/*
	 * Tuple table initialization (XXX not actually used...)
	 */
	ExecInitResultTupleSlot(estate, &limitstate->ps);

	/*
	 * then initialize outer plan
	 */
	outerPlan = outerPlan(node);
	outerPlanState(limitstate) = ExecInitNode(outerPlan, estate, eflags);

	/*
	 * limit nodes do no projections, so initialize projection info for this
	 * node appropriately
	 */
	ExecAssignResultTypeFromTL(&limitstate->ps);
	limitstate->ps.ps_ProjInfo = NULL;

	initGpmonPktForLimit((Plan *)node, &limitstate->ps.gpmon_pkt, estate);
	
	return limitstate;
}
Beispiel #8
0
/**
 * Init nodeDML, which initializes the insert TupleTableSlot.
 * */
DMLState*
ExecInitDML(DML *node, EState *estate, int eflags)
{
	
	/* check for unsupported flags */
	Assert(!(eflags & (EXEC_FLAG_BACKWARD | EXEC_FLAG_MARK | EXEC_FLAG_REWIND)));
	
	DMLState *dmlstate = makeNode(DMLState);
	dmlstate->ps.plan = (Plan *)node;
	dmlstate->ps.state = estate;

	ExecInitResultTupleSlot(estate, &dmlstate->ps);

	dmlstate->ps.targetlist = (List *)
						ExecInitExpr((Expr *) node->plan.targetlist,
						(PlanState *) dmlstate);

	Plan *outerPlan  = outerPlan(node);
	outerPlanState(dmlstate) = ExecInitNode(outerPlan, estate, eflags);

	ExecAssignResultTypeFromTL(&dmlstate->ps);

	/* Create expression evaluation context. This will be used for projections */
	ExecAssignExprContext(estate, &dmlstate->ps);

	/*
	 * Create projection info from the child tuple descriptor and our target list
	 * Projection will be placed in the ResultSlot
	 */
	TupleTableSlot *childResultSlot = outerPlanState(dmlstate)->ps_ResultTupleSlot;
	ExecAssignProjectionInfo(&dmlstate->ps, childResultSlot->tts_tupleDescriptor);
	
	/*
	 * Initialize slot to insert/delete using output relation descriptor.
	 */
	dmlstate->cleanedUpSlot = ExecInitExtraTupleSlot(estate);

	/*
	 * Both input and output of the junk filter include dropped attributes, so
	 * the junk filter doesn't need to do anything special there about them
	 */
	TupleDesc cleanTupType = CreateTupleDescCopy(dmlstate->ps.state->es_result_relation_info->ri_RelationDesc->rd_att); 
	dmlstate->junkfilter = ExecInitJunkFilter(node->plan.targetlist,
			cleanTupType,
			dmlstate->cleanedUpSlot);

	if (estate->es_instrument)
	{
	        dmlstate->ps.cdbexplainbuf = makeStringInfo();

	        /* Request a callback at end of query. */
	        dmlstate->ps.cdbexplainfun = ExecDMLExplainEnd;
	}

	initGpmonPktForDML((Plan *)node, &dmlstate->ps.gpmon_pkt, estate);
	
	return dmlstate;
}
Beispiel #9
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->hashtable = NULL;
	hashstate->hashkeys = NIL;	/* will be set by parent HashJoin */

	/*CHANGED BY YASIN*/
	if (eflags & EXEC_FLAG_INAROUND) hashstate->ps.ps_InAround = true;

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

#define HASH_NSLOTS 1

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

	/*
	 * initialize child expressions
	 */
	hashstate->ps.targetlist = (List *)
		ExecInitExpr((Expr *) node->plan.targetlist,
					 (PlanState *) hashstate);
	hashstate->ps.qual = (List *)
		ExecInitExpr((Expr *) 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;
}
Beispiel #10
0
/* ----------------------------------------------------------------
 *		ExecInitLimit
 *
 *		This initializes the limit node state structures and
 *		the node's subplan.
 * ----------------------------------------------------------------
 */
limit_ps *
ExecInitLimit(limit_pl *node, exec_state_n *estate, int eflags)
{
	limit_ps *limitstate;
	plan_n *outerPlan;

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

	/*
	 * create state structure
	 */
	limitstate = MK_N(LimitState,limit_ps);
	limitstate->ps.plan = (plan_n *) node;
	limitstate->ps.state = estate;
	limitstate->lstate = LIMIT_INITIAL;

	/*
	 * Miscellaneous initialization
	 *
	 * limit_pl nodes never call exec_qual or exec_projection, but they need an
	 * exprcontext anyway to evaluate the limit/offset parameters in.
	 */
	ExecAssignExprContext(estate, &limitstate->ps);

	/*
	 * initialize child expressions
	 */
	limitstate->limitOffset = exec_init_expr(
		(expr_n*) node->limitOffset,
		(plan_state_n*) limitstate);

	limitstate->limitCount = exec_init_expr(
		(expr_n*) node->limitCount,
		(plan_state_n*) limitstate);

	/*
	 * Tuple table initialization (XXX not actually used...)
	 */
	exec_init_result_tupslot(estate, &limitstate->ps);

	/*
	 * then initialize outer plan
	 */
	outerPlan = OUTER_PLAN(node);
	OUTER_PLAN_STATE(limitstate) = exec_init_node(outerPlan, estate, eflags);

	/*
	 * limit nodes do no projections, so initialize projection info for this
	 * node appropriately
	 */
	ExecAssignResultTypeFromTL(&limitstate->ps);
	limitstate->ps.ps_ProjInfo = NULL;

	return limitstate;
}
Beispiel #11
0
/* ----------------------------------------------------------------
 *		ExecInitHash
 *
 *		Init routine for hash_pl node
 * ----------------------------------------------------------------
 */
hash_ps *
ExecInitHash(hash_pl *node, exec_state_n *estate, int eflags)
{
	hash_ps* hashstate;

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

	/*
	 * create state structure
	 */
	hashstate = MK_N(HashState,hash_ps);
	hashstate->ps.plan = (plan_n *) node;
	hashstate->ps.state = estate;
	hashstate->hashtable = NULL;
	hashstate->hashkeys = NIL;	/* will be set by parent hash_join_jo */

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

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

	/*
	 * initialize child expressions
	 */
	hashstate->ps.targetlist = (struct list*) exec_init_expr(
		(expr_n*) node->plan.targetlist,
		(plan_state_n*) hashstate);

	hashstate->ps.qual = (struct list*) exec_init_expr(
		(expr_n*) node->plan.qual,
		(plan_state_n *) hashstate);

	/*
	 * initialize child nodes
	 */
	OUTER_PLAN_STATE(hashstate) = exec_init_node(OUTER_PLAN(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;
}
Beispiel #12
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;
}
Beispiel #13
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;
}
Beispiel #14
0
/* ----------------------------------------------------------------
 *		ExecInitMaterial
 * ----------------------------------------------------------------
 */
MaterialState *
ExecInitMaterial(Material *node, EState *estate)
{
	MaterialState *matstate;
	Plan	   *outerPlan;

	/*
	 * create state structure
	 */
	matstate = makeNode(MaterialState);
	matstate->ss.ps.plan = (Plan *) node;
	matstate->ss.ps.state = estate;

	matstate->tuplestorestate = NULL;
	matstate->eof_underlying = false;

	/*
	 * Miscellaneous initialization
	 *
	 * Materialization nodes don't need ExprContexts because they never call
	 * ExecQual or ExecProject.
	 */

#define MATERIAL_NSLOTS 2

	/*
	 * tuple table initialization
	 *
	 * material nodes only return tuples from their materialized relation.
	 */
	ExecInitResultTupleSlot(estate, &matstate->ss.ps);
	ExecInitScanTupleSlot(estate, &matstate->ss);

	/*
	 * initializes child nodes
	 */
	outerPlan = outerPlan(node);
	outerPlanState(matstate) = ExecInitNode(outerPlan, estate);

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

	return matstate;
}
Beispiel #15
0
RepeatState *
ExecInitRepeat(Repeat *node, EState *estate, int eflags)
{
	RepeatState *repeatstate;

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

	/*
	 * Create state structure.
	 */
	repeatstate = makeNode(RepeatState);
	repeatstate->ps.plan = (Plan *)node;
	repeatstate->ps.state = estate;

	/* Create expression context for the node. */
	ExecAssignExprContext(estate, &repeatstate->ps);
	
	ExecInitResultTupleSlot(estate, &repeatstate->ps);
	
	/* Initialize child expressions */
	repeatstate->ps.targetlist = (List *)
		ExecInitExpr((Expr *)node->plan.targetlist,
					 (PlanState *)repeatstate);
	repeatstate->ps.qual = (List *)
		ExecInitExpr((Expr *)node->plan.qual,
					 (PlanState *)repeatstate);
	repeatstate->expr_state =
		ExecInitExpr(node->repeatCountExpr,
					 (PlanState *)repeatstate);

	/* Initialize child nodes */
	outerPlanState(repeatstate) = ExecInitNode(outerPlan(node), estate, eflags);

	/* Inner plan is not used. */
	Assert(innerPlan(node) == NULL);
	
	/* Initialize tuple type and projection info */
	ExecAssignResultTypeFromTL(&repeatstate->ps);
	ExecAssignProjectionInfo(&repeatstate->ps, NULL);

	init_RepeatState(repeatstate);
	
	initGpmonPktForRepeat((Plan *)node, &repeatstate->ps.gpmon_pkt, estate);
	
	return repeatstate;
}
Beispiel #16
0
/*
 * InitScanStateInternal
 *   Initialize ScanState common variables for various Scan node.
 */
void
InitScanStateInternal(ScanState *scanState, Plan *plan, EState *estate,
		int eflags, bool initCurrentRelation)
{
	Assert(IsA(plan, SeqScan) ||
		   IsA(plan, AppendOnlyScan) ||
		   IsA(plan, ParquetScan) ||
		   IsA(plan, TableScan) ||
		   IsA(plan, DynamicTableScan) ||
		   IsA(plan, BitmapTableScan));

	PlanState *planState = &scanState->ps;

	planState->plan = plan;
	planState->state = estate;

	/* Create expression evaluation context */
	ExecAssignExprContext(estate, planState);
	
	/* Initialize tuple table slot */
	ExecInitResultTupleSlot(estate, planState);
	ExecInitScanTupleSlot(estate, scanState);
	
	/*
	 * For dynamic table scan, We do not initialize expression states; instead
	 * we wait until the first partition, and initialize the expression state
	 * at that time. Also, for dynamic table scan, we do not need to open the
	 * parent partition relation.
	 */
	if (initCurrentRelation)
	{
		InitScanStateRelationDetails(scanState, plan, estate);
	}

	/* Initialize result tuple type. */
	ExecAssignResultTypeFromTL(planState);

	/*
	 * If eflag contains EXEC_FLAG_REWIND or EXEC_FLAG_BACKWARD or EXEC_FLAG_MARK,
	 * then this node is not eager free safe.
	 */
	scanState->ps.delayEagerFree =
		((eflags & (EXEC_FLAG_REWIND | EXEC_FLAG_BACKWARD | EXEC_FLAG_MARK)) != 0);

	/* Currently, only SeqScan supports Mark/Restore. */
	AssertImply((eflags & EXEC_FLAG_MARK) != 0, IsA(plan, SeqScan));

}
/* ----------------------------------------------------------------
 *		ExecInitPartitionSelector
 *
 *		Create the run-time state information for PartitionSelector node
 *		produced by Orca and initializes outer child if exists.
 *
 * ----------------------------------------------------------------
 */
PartitionSelectorState *
ExecInitPartitionSelector(PartitionSelector *node, EState *estate, int eflags)
{
	/* check for unsupported flags */
	Assert (!(eflags & (EXEC_FLAG_MARK | EXEC_FLAG_BACKWARD)));

	PartitionSelectorState *psstate = initPartitionSelection(node, estate);

	/* tuple table initialization */
	ExecInitResultTupleSlot(estate, &psstate->ps);
	ExecAssignResultTypeFromTL(&psstate->ps);
	ExecAssignProjectionInfo(&psstate->ps, NULL);

	/* initialize child nodes */
	/* No inner plan for PartitionSelector */
	Assert(NULL == innerPlan(node));
	if (NULL != outerPlan(node))
	{
		outerPlanState(psstate) = ExecInitNode(outerPlan(node), estate, eflags);
	}

	/*
	 * Initialize projection, to produce a tuple that has the partitioning key
	 * columns at the same positions as in the partitioned table.
	 */
	if (node->partTabTargetlist)
	{
		List	   *exprStates;

		exprStates = (List *) ExecInitExpr((Expr *) node->partTabTargetlist,
										   (PlanState *) psstate);

		psstate->partTabDesc = ExecTypeFromTL(node->partTabTargetlist, false);
		psstate->partTabSlot = MakeSingleTupleTableSlot(psstate->partTabDesc);
		psstate->partTabProj = ExecBuildProjectionInfo(exprStates,
													   psstate->ps.ps_ExprContext,
													   psstate->partTabSlot,
													   ExecGetResultType(&psstate->ps));
	}

	initGpmonPktForPartitionSelector((Plan *)node, &psstate->ps.gpmon_pkt, estate);

	return psstate;
}
Beispiel #18
0
TwiceState *
ExecInitTwice(Twice *node, EState *estate, int eflags)
{
	TwiceState *twicestate;

	/*
	 * create state structure
	 */
	twicestate = makeNode(TwiceState);
	twicestate->ps.plan = (Plan *) node;
	twicestate->ps.state = estate;

	/*
	 * Tuple table initialization
	 */
	ExecInitResultTupleSlot(estate, &twicestate->ps);

	/*
	 * then initialize outer plan
	 */
	outerPlanState(twicestate) = ExecInitNode(outerPlan(node),
											  estate,
											  eflags);

	/*
	 * twice nodes do no projections, so initialize projection info for this
	 * node appropriately, i.e. keep all attributes as they are.
	 */
	ExecAssignResultTypeFromTL(&twicestate->ps);
	twicestate->ps.ps_ProjInfo = NULL;

	/*
	 * Set output counter for each tuple to zero, s.t. we know that it is the
	 * first output overall.
	 */
	twicestate->isFirst = true;

	return twicestate;
}
Beispiel #19
0
/* ----------------------------------------------------------------
 *		ExecInitSetOp
 *
 *		This initializes the setop node state structures and
 *		the node's subplan.
 * ----------------------------------------------------------------
 */
SetOpState *
ExecInitSetOp(SetOp *node, EState *estate, int eflags)
{
	SetOpState *setopstate;

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

	/*
	 * create state structure
	 */
	setopstate = makeNode(SetOpState);
	setopstate->ps.plan = (Plan *) node;
	setopstate->ps.state = estate;

	setopstate->eqfunctions = NULL;
	setopstate->hashfunctions = NULL;
	setopstate->setop_done = false;
	setopstate->numOutput = 0;
	setopstate->pergroup = NULL;
	setopstate->grp_firstTuple = NULL;
	setopstate->hashtable = NULL;
	setopstate->tableContext = NULL;

	/*
	 * Miscellaneous initialization
	 *
	 * SetOp nodes have no ExprContext initialization because they never call
	 * ExecQual or ExecProject.  But they do need a per-tuple memory context
	 * anyway for calling execTuplesMatch.
	 */
	setopstate->tempContext =
		AllocSetContextCreate(CurrentMemoryContext,
							  "SetOp",
							  ALLOCSET_DEFAULT_MINSIZE,
							  ALLOCSET_DEFAULT_INITSIZE,
							  ALLOCSET_DEFAULT_MAXSIZE);

	/*
	 * If hashing, we also need a longer-lived context to store the hash
	 * table.  The table can't just be kept in the per-query context because
	 * we want to be able to throw it away in ExecReScanSetOp.
	 */
	if (node->strategy == SETOP_HASHED)
		setopstate->tableContext =
			AllocSetContextCreate(CurrentMemoryContext,
								  "SetOp hash table",
								  ALLOCSET_DEFAULT_MINSIZE,
								  ALLOCSET_DEFAULT_INITSIZE,
								  ALLOCSET_DEFAULT_MAXSIZE);

	/*
	 * Tuple table initialization
	 */
	ExecInitResultTupleSlot(estate, &setopstate->ps);

	/*
	 * initialize child nodes
	 *
	 * If we are hashing then the child plan does not need to handle REWIND
	 * efficiently; see ExecReScanSetOp.
	 */
	if (node->strategy == SETOP_HASHED)
		eflags &= ~EXEC_FLAG_REWIND;
	outerPlanState(setopstate) = ExecInitNode(outerPlan(node), estate, eflags);

	/*
	 * setop nodes do no projections, so initialize projection info for this
	 * node appropriately
	 */
	ExecAssignResultTypeFromTL(&setopstate->ps);
	setopstate->ps.ps_ProjInfo = NULL;

	/*
	 * Precompute fmgr lookup data for inner loop. We need both equality and
	 * hashing functions to do it by hashing, but only equality if not
	 * hashing.
	 */
	if (node->strategy == SETOP_HASHED)
		execTuplesHashPrepare(node->numCols,
							  node->dupOperators,
							  &setopstate->eqfunctions,
							  &setopstate->hashfunctions);
	else
		setopstate->eqfunctions =
			execTuplesMatchPrepare(node->numCols,
								   node->dupOperators);

	if (node->strategy == SETOP_HASHED)
	{
		build_hash_table(setopstate);
		setopstate->table_filled = false;
	}
	else
	{
		setopstate->pergroup =
			(SetOpStatePerGroup) palloc0(sizeof(SetOpStatePerGroupData));
	}

	return setopstate;
}
Beispiel #20
0
/* ----------------------------------------------------------------
 *		ExecInitMaterial
 * ----------------------------------------------------------------
 */
MaterialState *
ExecInitMaterial(Material *node, EState *estate, int eflags)
{
	MaterialState *matstate;
	Plan	   *outerPlan;

	/*
	 * create state structure
	 */
	matstate = makeNode(MaterialState);
	matstate->ss.ps.plan = (Plan *) node;
	matstate->ss.ps.state = estate;

	/*
	 * We must have random access to the subplan output to do backward scan
	 * or mark/restore.  We also prefer to materialize the subplan output
	 * if we might be called on to rewind and replay it many times.
	 * However, if none of these cases apply, we can skip storing the data.
	 */
	matstate->randomAccess = (eflags & (EXEC_FLAG_REWIND |
										EXEC_FLAG_BACKWARD |
										EXEC_FLAG_MARK)) != 0;

	matstate->eof_underlying = false;
	matstate->tuplestorestate = NULL;

	/*
	 * Miscellaneous initialization
	 *
	 * Materialization nodes don't need ExprContexts because they never call
	 * ExecQual or ExecProject.
	 */

#define MATERIAL_NSLOTS 2

	/*
	 * tuple table initialization
	 *
	 * material nodes only return tuples from their materialized relation.
	 */
	ExecInitResultTupleSlot(estate, &matstate->ss.ps);
	ExecInitScanTupleSlot(estate, &matstate->ss);

	/*
	 * initialize child nodes
	 *
	 * We shield the child node from the need to support REWIND, BACKWARD,
	 * or MARK/RESTORE.
	 */
	eflags &= ~(EXEC_FLAG_REWIND | EXEC_FLAG_BACKWARD | EXEC_FLAG_MARK);

	outerPlan = outerPlan(node);
	outerPlanState(matstate) = ExecInitNode(outerPlan, estate, eflags);

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

	return matstate;
}
/* ----------------------------------------------------------------
 *		ExecInitSubqueryScan
 * ----------------------------------------------------------------
 */
SubqueryScanState *
ExecInitSubqueryScan(SubqueryScan *node, EState *estate)
{
	SubqueryScanState *subquerystate;
	RangeTblEntry *rte;
	EState	   *sp_estate;
	MemoryContext oldcontext;

	/*
	 * 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;

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

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

#define SUBQUERYSCAN_NSLOTS 2

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

	/*
	 * initialize subquery
	 *
	 * This should agree with ExecInitSubPlan
	 */
	rte = rt_fetch(node->scan.scanrelid, estate->es_range_table);
	Assert(rte->rtekind == RTE_SUBQUERY);

	/*
	 * Do access checking on the rangetable entries in the subquery.
	 */
	ExecCheckRTPerms(rte->subquery->rtable);

	/*
	 * The subquery needs its own EState because it has its own rangetable. It
	 * shares our Param ID space, however.	XXX if rangetable access were done
	 * differently, the subquery could share our EState, which would eliminate
	 * some thrashing about in this module...
	 */
	sp_estate = CreateExecutorState();
	subquerystate->sss_SubEState = sp_estate;

	oldcontext = MemoryContextSwitchTo(sp_estate->es_query_cxt);

	sp_estate->es_range_table = rte->subquery->rtable;
	sp_estate->es_param_list_info = estate->es_param_list_info;
	sp_estate->es_param_exec_vals = estate->es_param_exec_vals;
	sp_estate->es_tupleTable =
		ExecCreateTupleTable(ExecCountSlotsNode(node->subplan) + 10);
	sp_estate->es_snapshot = estate->es_snapshot;
	sp_estate->es_crosscheck_snapshot = estate->es_crosscheck_snapshot;
	sp_estate->es_instrument = estate->es_instrument;

	/*
	 * Start up the subplan (this is a very cut-down form of InitPlan())
	 */
	subquerystate->subplan = ExecInitNode(node->subplan, sp_estate);

	MemoryContextSwitchTo(oldcontext);

	subquerystate->ss.ps.ps_TupFromTlist = false;

	/*
	 * Initialize scan tuple type (needed by ExecAssignScanProjectionInfo)
	 */
	ExecAssignScanType(&subquerystate->ss,
					   ExecGetResultType(subquerystate->subplan),
					   false);

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

	return subquerystate;
}
Beispiel #22
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->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 = (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 */
		Assert(IsA(scanstate->leader, CteScanState));
		/* 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);

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

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

	/*
	 * 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.
	 */
	ExecAssignScanType(&scanstate->ss,
					   ExecGetResultType(scanstate->cteplanstate));

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

	return scanstate;
}
Beispiel #23
0
/* ----------------------------------------------------------------
 *		ExecInitSort
 *
 *		Creates the run-time state information for the sort node
 *		produced by the planner and initializes its outer subtree.
 * ----------------------------------------------------------------
 */
SortState *
ExecInitSort(Sort *node, EState *estate, int eflags)
{
	SortState  *sortstate;

	SO1_printf("ExecInitSort: %s\n",
			   "initializing sort node");

	/*
	 * create state structure
	 */
	sortstate = makeNode(SortState);
	sortstate->ss.ps.plan = (Plan *) node;
	sortstate->ss.ps.state = estate;

	/*
	 * We must have random access to the sort output to do backward scan or
	 * mark/restore.  We also prefer to materialize the sort output if we
	 * might be called on to rewind and replay it many times.
	 */
	sortstate->randomAccess = (eflags & (EXEC_FLAG_REWIND |
										 EXEC_FLAG_BACKWARD |
										 EXEC_FLAG_MARK)) != 0;

	sortstate->bounded = false;
	sortstate->sort_Done = false;
	sortstate->tuplesortstate = NULL;

	/*
	 * Miscellaneous initialization
	 *
	 * Sort nodes don't initialize their ExprContexts because they never call
	 * ExecQual or ExecProject.
	 */

	/*
	 * tuple table initialization
	 *
	 * sort nodes only return scan tuples from their sorted relation.
	 */
	ExecInitResultTupleSlot(estate, &sortstate->ss.ps);
	ExecInitScanTupleSlot(estate, &sortstate->ss);

	/*
	 * initialize child nodes
	 *
	 * We shield the child node from the need to support REWIND, BACKWARD, or
	 * MARK/RESTORE.
	 */
	eflags &= ~(EXEC_FLAG_REWIND | EXEC_FLAG_BACKWARD | EXEC_FLAG_MARK);

	outerPlanState(sortstate) = ExecInitNode(outerPlan(node), estate, eflags);

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

	SO1_printf("ExecInitSort: %s\n",
			   "sort node initialized");

	return sortstate;
}
Beispiel #24
0
/* ----------------------------------------------------------------
 *		ExecInitForeignScan
 * ----------------------------------------------------------------
 */
ForeignScanState *
ExecInitForeignScan(ForeignScan *node, EState *estate, int eflags)
{
	ForeignScanState *scanstate;
	Relation	currentRelation;
	FdwRoutine *fdwroutine;

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

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

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

	scanstate->ss.ps.ps_TupFromTlist = false;

	/*
	 * initialize child expressions
	 */
	scanstate->ss.ps.targetlist = (List *)
		ExecInitExpr((Expr *) node->scan.plan.targetlist,
					 (PlanState *) scanstate);
	scanstate->ss.ps.qual = (List *)
		ExecInitExpr((Expr *) node->scan.plan.qual,
					 (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);
	scanstate->ss.ss_currentRelation = currentRelation;

	/*
	 * 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);

	/*
	 * Acquire function pointers from the FDW's handler, and init fdw_state.
	 */
	fdwroutine = GetFdwRoutineByRelId(RelationGetRelid(currentRelation));
	scanstate->fdwroutine = fdwroutine;
	scanstate->fdw_state = NULL;

	/*
	 * Tell the FDW to initiate the scan.
	 */
	fdwroutine->BeginForeignScan(scanstate, eflags);

	return scanstate;
}
Beispiel #25
0
/* ----------------------------------------------------------------
 *		ExecInitMaterial
 * ----------------------------------------------------------------
 */
MaterialState *
ExecInitMaterial(Material *node, EState *estate, int eflags)
{
	MaterialState *matstate;
	Plan	   *outerPlan;

	/*
	 * create state structure
	 */
	matstate = makeNode(MaterialState);
	matstate->ss.ps.plan = (Plan *) node;
	matstate->ss.ps.state = estate;

	/*
	 * We must have random access to the subplan output to do backward scan or
	 * mark/restore.  We also prefer to materialize the subplan output if we
	 * might be called on to rewind and replay it many times. However, if none
	 * of these cases apply, we can skip storing the data.
	 */
	matstate->randomAccess = node->cdb_strict ||
							(eflags & (EXEC_FLAG_REWIND |
										EXEC_FLAG_BACKWARD |
										EXEC_FLAG_MARK)) != 0;

	matstate->eof_underlying = false;
	matstate->ts_state = palloc0(sizeof(GenericTupStore));
	matstate->ts_pos = NULL;
	matstate->ts_markpos = NULL;
	matstate->share_lk_ctxt = NULL;
	matstate->ts_destroyed = false;
	ExecMaterialResetWorkfileState(matstate);

	/*
	 * Miscellaneous initialization
	 *
	 * Materialization nodes don't need ExprContexts because they never call
	 * ExecQual or ExecProject.
	 */

#define MATERIAL_NSLOTS 2

	/*
	 * tuple table initialization
	 *
	 * material nodes only return tuples from their materialized relation.
	 */
	ExecInitResultTupleSlot(estate, &matstate->ss.ps);
	matstate->ss.ss_ScanTupleSlot = ExecInitExtraTupleSlot(estate);

	/*
	 * If eflag contains EXEC_FLAG_REWIND or EXEC_FLAG_BACKWARD or EXEC_FLAG_MARK,
	 * then this node is not eager free safe.
	 */
	matstate->ss.ps.delayEagerFree =
		((eflags & (EXEC_FLAG_REWIND | EXEC_FLAG_BACKWARD | EXEC_FLAG_MARK)) != 0);

	/*
	 * initialize child nodes
	 *
	 * We shield the child node from the need to support BACKWARD, or
	 * MARK/RESTORE.
	 */
	eflags &= ~(EXEC_FLAG_BACKWARD | EXEC_FLAG_MARK);

	/*
	 * If Materialize does not have any external parameters, then it
	 * can shield the child node from being rescanned as well, hence
	 * we can clear the EXEC_FLAG_REWIND as well. If there are parameters,
	 * don't clear the REWIND flag, as the child will be rewound.
	 */
	if (node->plan.allParam == NULL || node->plan.extParam == NULL)
	{
		eflags &= ~EXEC_FLAG_REWIND;
	}

	outerPlan = outerPlan(node);
	/*
	 * A very basic check to see if the optimizer requires the material to do a projection.
	 * Ideally, this check would recursively compare all the target list expressions. However,
	 * such a check is tricky because of the varno mismatch (outer plan may have a varno that
	 * index into range table, while the material may refer to the same relation as "outer" varno)
	 * [JIRA: MPP-25365]
	 */
	insist_log(list_length(node->plan.targetlist) == list_length(outerPlan->targetlist),
			"Material operator does not support projection");
	outerPlanState(matstate) = ExecInitNode(outerPlan, estate, eflags);

	/*
	 * If the child node of a Material is a Motion, then this Material node is
	 * not eager free safe.
	 */
	if (IsA(outerPlan((Plan *)node), Motion))
	{
		matstate->ss.ps.delayEagerFree = true;
	}

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

	/*
	 * If share input, need to register with range table entry
	 */
	if(node->share_type != SHARE_NOTSHARED) 
	{
		ShareNodeEntry *snEntry = ExecGetShareNodeEntry(estate, node->share_id, true); 
		snEntry->sharePlan = (Node *) node;
		snEntry->shareState = (Node *) matstate;
	}

	initGpmonPktForMaterial((Plan *)node, &matstate->ss.ps.gpmon_pkt, estate);

	return matstate;
}
/* ----------------------------------------------------------------
 *		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->ioss_HeapFetches = 0;

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

	indexstate->ss.ps.ps_TupFromTlist = false;

	/*
	 * 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.targetlist = (List *)
		ExecInitExpr((Expr *) node->scan.plan.targetlist,
					 (PlanState *) indexstate);
	indexstate->ss.ps.qual = (List *)
		ExecInitExpr((Expr *) node->scan.plan.qual,
					 (PlanState *) indexstate);
	indexstate->indexqual = (List *)
		ExecInitExpr((Expr *) node->indexqual,
					 (PlanState *) indexstate);

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

	/*
	 * open the base relation and acquire appropriate lock on it.
	 */
	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, false);
	ExecAssignScanType(&indexstate->ss, tupDesc);

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

	/*
	 * 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;
	}

	/*
	 * Initialize scan descriptor.
	 */
	indexstate->ioss_ScanDesc = index_beginscan(currentRelation,
												indexstate->ioss_RelationDesc,
												estate->es_snapshot,
												indexstate->ioss_NumScanKeys,
											indexstate->ioss_NumOrderByKeys);

	/* Set it up for index-only scan */
	indexstate->ioss_ScanDesc->xs_want_itup = true;
	indexstate->ioss_VMBuffer = InvalidBuffer;

	/*
	 * If no run-time keys to calculate, go ahead and pass the scankeys to the
	 * index AM.
	 */
	if (indexstate->ioss_NumRuntimeKeys == 0)
		index_rescan(indexstate->ioss_ScanDesc,
					 indexstate->ioss_ScanKeys,
					 indexstate->ioss_NumScanKeys,
					 indexstate->ioss_OrderByKeys,
					 indexstate->ioss_NumOrderByKeys);

	/*
	 * all done.
	 */
	return indexstate;
}
Beispiel #27
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->rs_done = false;
	resstate->rs_checkqual = (node->resconstantqual == NULL) ? false : true;

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

	resstate->ps.ps_TupFromTlist = false;

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

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

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

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

	/*
	 * initialize tuple type and projection info
	 */
	ExecAssignResultTypeFromTL(&resstate->ps);
	ExecAssignProjectionInfo(&resstate->ps, NULL);

	return resstate;
}
/* ----------------------------------------------------------------
 *		ExecInitIndexScan
 *
 *		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.
 * ----------------------------------------------------------------
 */
IndexScanState *
ExecInitIndexScan(IndexScan *node, EState *estate, int eflags)
{
    IndexScanState *indexstate;
    Relation	currentRelation;
    bool		relistarget;

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

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

    /*indexstate->ss.ps.ps_TupFromTlist = false;*/

    /*
     * initialize child expressions
     *
     * Note: we don't initialize all of the indexqual expression, only the
     * sub-parts corresponding to runtime keys (see below).  The indexqualorig
     * expression is always initialized even though it will only be used in
     * some uncommon cases --- would be nice to improve that.  (Problem is
     * that any SubPlans present in the expression must be found now...)
     */
    indexstate->ss.ps.targetlist = (List *)
                                   ExecInitExpr((Expr *) node->scan.plan.targetlist,
                                           (PlanState *) indexstate);
    indexstate->ss.ps.qual = (List *)
                             ExecInitExpr((Expr *) node->scan.plan.qual,
                                          (PlanState *) indexstate);
    indexstate->indexqualorig = (List *)
                                ExecInitExpr((Expr *) node->indexqualorig,
                                        (PlanState *) indexstate);

#define INDEXSCAN_NSLOTS 2

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

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

    indexstate->ss.ss_currentRelation = currentRelation;

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

    /*
     * 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->iss_RelationDesc = index_open(node->indexid,
                                   relistarget ? NoLock : AccessShareLock);

    /*
     * build the index scan keys from the index qualification
     */
    ExecIndexBuildScanKeys((PlanState *) indexstate,
                           indexstate->iss_RelationDesc,
                           node->indexqual,
                           node->indexstrategy,
                           node->indexsubtype,
                           &indexstate->iss_ScanKeys,
                           &indexstate->iss_NumScanKeys,
                           &indexstate->iss_RuntimeKeys,
                           &indexstate->iss_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->iss_NumRuntimeKeys != 0)
    {
        ExprContext *stdecontext = indexstate->ss.ps.ps_ExprContext;

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

    /*
     * Initialize index-specific scan state
     */
    indexstate->iss_RuntimeKeysReady = false;

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

    initGpmonPktForIndexScan((Plan *)node, &indexstate->ss.ps.gpmon_pkt, estate);

    /*
     * If eflag contains EXEC_FLAG_REWIND or EXEC_FLAG_BACKWARD or EXEC_FLAG_MARK,
     * then this node is not eager free safe.
     */
    indexstate->ss.ps.delayEagerFree =
        ((eflags & (EXEC_FLAG_REWIND | EXEC_FLAG_BACKWARD | EXEC_FLAG_MARK)) != 0);

    /*
     * all done.
     */
    return indexstate;
}
Beispiel #29
0
/* ----------------------------------------------------------------
 *		ExecInitIndexScan
 *
 *		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.
 * ----------------------------------------------------------------
 */
IndexScanState *
ExecInitIndexScan(IndexScan *node, EState *estate, int eflags)
{
	IndexScanState *indexstate;
	Relation	currentRelation;
	bool		relistarget;

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

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

	indexstate->ss.ps.ps_TupFromTlist = false;

	/*
	 * initialize child expressions
	 *
	 * Note: we don't initialize all of the indexqual expression, only the
	 * sub-parts corresponding to runtime keys (see below).  Likewise for
	 * indexorderby, if any.  But the indexqualorig expression is always
	 * initialized even though it will only be used in some uncommon cases ---
	 * would be nice to improve that.  (Problem is that any SubPlans present
	 * in the expression must be found now...)
	 */
	indexstate->ss.ps.targetlist = (List *)
		ExecInitExpr((Expr *) node->scan.plan.targetlist,
					 (PlanState *) indexstate);
	indexstate->ss.ps.qual = (List *)
		ExecInitExpr((Expr *) node->scan.plan.qual,
					 (PlanState *) indexstate);
	indexstate->indexqualorig = (List *)
		ExecInitExpr((Expr *) node->indexqualorig,
					 (PlanState *) indexstate);

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

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

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

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

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

	/*
	 * 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->iss_RelationDesc = index_open(node->indexid,
									 relistarget ? NoLock : AccessShareLock);

	/*
	 * Initialize index-specific scan state
	 */
	indexstate->iss_RuntimeKeysReady = false;
	indexstate->iss_RuntimeKeys = NULL;
	indexstate->iss_NumRuntimeKeys = 0;

	/*
	 * build the index scan keys from the index qualification
	 */
	ExecIndexBuildScanKeys((PlanState *) indexstate,
						   indexstate->iss_RelationDesc,
						   node->scan.scanrelid,
						   node->indexqual,
						   false,
						   &indexstate->iss_ScanKeys,
						   &indexstate->iss_NumScanKeys,
						   &indexstate->iss_RuntimeKeys,
						   &indexstate->iss_NumRuntimeKeys,
						   NULL,	/* no ArrayKeys */
						   NULL);

	/*
	 * any ORDER BY exprs have to be turned into scankeys in the same way
	 */
	ExecIndexBuildScanKeys((PlanState *) indexstate,
						   indexstate->iss_RelationDesc,
						   node->scan.scanrelid,
						   node->indexorderby,
						   true,
						   &indexstate->iss_OrderByKeys,
						   &indexstate->iss_NumOrderByKeys,
						   &indexstate->iss_RuntimeKeys,
						   &indexstate->iss_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->iss_NumRuntimeKeys != 0)
	{
		ExprContext *stdecontext = indexstate->ss.ps.ps_ExprContext;

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

	/*
	 * Initialize scan descriptor.
	 */
	indexstate->iss_ScanDesc = index_beginscan(currentRelation,
											   indexstate->iss_RelationDesc,
											   estate->es_snapshot,
											   indexstate->iss_NumScanKeys,
											 indexstate->iss_NumOrderByKeys);

	/*
	 * If no run-time keys to calculate, go ahead and pass the scankeys to the
	 * index AM.
	 */
	if (indexstate->iss_NumRuntimeKeys == 0)
		index_rescan(indexstate->iss_ScanDesc,
					 indexstate->iss_ScanKeys, indexstate->iss_NumScanKeys,
				indexstate->iss_OrderByKeys, indexstate->iss_NumOrderByKeys);

	/*
	 * all done.
	 */
	return indexstate;
}
Beispiel #30
0
/* ----------------------------------------------------------------
 *		ExecInitSetOp
 *
 *		This initializes the setop node state structures and
 *		the node's subplan.
 * ----------------------------------------------------------------
 */
SetOpState *
ExecInitSetOp(SetOp *node, EState *estate, int eflags)
{
	SetOpState *setopstate;

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

	/*
	 * create state structure
	 */
	setopstate = makeNode(SetOpState);
	setopstate->ps.plan = (Plan *) node;
	setopstate->ps.state = estate;

	setopstate->ps.ps_OuterTupleSlot = NULL;
	setopstate->subplan_done = false;
	setopstate->numOutput = 0;

	/*
	 * Miscellaneous initialization
	 *
	 * SetOp nodes have no ExprContext initialization because they never call
	 * ExecQual or ExecProject.  But they do need a per-tuple memory context
	 * anyway for calling execTuplesMatch.
	 */
	setopstate->tempContext =
		AllocSetContextCreate(CurrentMemoryContext,
							  "SetOp",
							  ALLOCSET_DEFAULT_MINSIZE,
							  ALLOCSET_DEFAULT_INITSIZE,
							  ALLOCSET_DEFAULT_MAXSIZE);

#define SETOP_NSLOTS 1

	/*
	 * Tuple table initialization
	 */
	ExecInitResultTupleSlot(estate, &setopstate->ps);

	/*
	 * then initialize outer plan
	 */
	outerPlanState(setopstate) = ExecInitNode(outerPlan(node), estate, eflags);

	/*
	 * setop nodes do no projections, so initialize projection info for this
	 * node appropriately
	 */
	ExecAssignResultTypeFromTL(&setopstate->ps);
	setopstate->ps.ps_ProjInfo = NULL;

	/*
	 * Precompute fmgr lookup data for inner loop
	 */
	setopstate->eqfunctions =
		execTuplesMatchPrepare(ExecGetResultType(&setopstate->ps),
							   node->numCols,
							   node->dupColIdx);

	return setopstate;
}