/* ----------------------------------------------------------------
* InitScanRelation
*
* This does the initialization for scan relations and
* subplans of scans.
* ----------------------------------------------------------------
*/
static void
InitScanRelation(SeqScanState *node, EState *estate)
{
Relation currentRelation;
HeapScanDesc currentScanDesc;
//elog(WARNING, "InitScanRelation");
/*
* get the relation object id from the relid'th entry in the range table,
* open that relation and acquire appropriate lock on it.
*/
currentRelation = ExecOpenScanRelation(estate,
((SeqScan *) node->ps.plan)->scanrelid);
//elog(WARNING, "Rel kind %c",currentRelation->rd_rel->relkind);
if(currentRelation->rd_rel->relkind== RELKIND_ARRAY)
currentScanDesc = heap_beginscan_ar(currentRelation,
estate->es_snapshot,
0,
NULL);
else
currentScanDesc = heap_beginscan(currentRelation,
estate->es_snapshot,
0,
NULL);
node->ss_currentRelation = currentRelation;
node->ss_currentScanDesc = currentScanDesc;
ExecAssignScanType(node, RelationGetDescr(currentRelation));
}
/* ----------------------------------------------------------------
* InitScanRelation
*
* Set up to access the scan relation.
* ----------------------------------------------------------------
*/
static void
InitScanRelation(SeqScanState *node, EState *estate, int eflags)
{
Relation currentRelation;
HeapScanDesc currentScanDesc;
/*
* get the relation object id from the relid'th entry in the range table,
* open that relation and acquire appropriate lock on it.
*/
currentRelation = ExecOpenScanRelation(estate,
((SeqScan *) node->ps.plan)->scanrelid,
eflags);
/* initialize a heapscan */
currentScanDesc = heap_beginscan(currentRelation,
estate->es_snapshot,
0,
NULL);
node->ss_currentRelation = currentRelation;
node->ss_currentScanDesc = currentScanDesc;
/* and report the scan tuple slot's rowtype */
ExecAssignScanType(node, RelationGetDescr(currentRelation));
}
/* ----------------------------------------------------------------
* InitScanRelation
*
* This does the initialization for scan relations and
* subplans of scans.
* ----------------------------------------------------------------
*/
static void
InitScanRelation(SeqScanState *node, EState *estate)
{
Relation currentRelation;
HeapScanDesc currentScanDesc;
/*
* get the relation object id from the relid'th entry in the range table,
* open that relation and acquire appropriate lock on it.
*/
/*CHANGED BY YASIN*/
if (node->ps.ps_InAround) /*If this is in the around branch*/
/*currentRelation = ExecOpenScanRelationAround(estate,((SeqScan *) node->ps.plan)->scanrelid);*/
currentRelation = ExecOpenScanRelation(estate,((SeqScan *) node->ps.plan)->scanrelid);
else /*Original code*/
currentRelation = ExecOpenScanRelation(estate,((SeqScan *) node->ps.plan)->scanrelid);
currentScanDesc = heap_beginscan(currentRelation,
estate->es_snapshot,
0,
NULL);
node->ss_currentRelation = currentRelation;
node->ss_currentScanDesc = currentScanDesc;
ExecAssignScanType(node, RelationGetDescr(currentRelation));
}
/* ----------------------------------------------------------------
* 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;
}
/* ----------------------------------------------------------------
* InitScanRelation
*
* This does the initialization for scan relations and
* subplans of scans.
* ----------------------------------------------------------------
*/
static void
InitScanRelation(SeqScanState *node, EState *estate)
{
Relation currentRelation;
/*
* get the relation object id from the relid'th entry in the range table,
* open that relation and acquire appropriate lock on it.
*/
currentRelation = ExecOpenScanRelation(estate, ((SeqScan *) node->ps.plan)->scanrelid);
node->ss_currentRelation = currentRelation;
ExecAssignScanType(node, RelationGetDescr(currentRelation));
}
/* ----------------------------------------------------------------
* InitScanRelation
*
* Set up to access the scan relation.
* ----------------------------------------------------------------
*/
static void
InitScanRelation(SeqScanState *node, EState *estate, int eflags)
{
Relation currentRelation;
/*
* get the relation object id from the relid'th entry in the range table,
* open that relation and acquire appropriate lock on it.
*/
currentRelation = ExecOpenScanRelation(estate,
((SeqScan *) node->ss.ps.plan)->scanrelid,
eflags);
node->ss.ss_currentRelation = currentRelation;
/* and report the scan tuple slot's rowtype */
ExecAssignScanType(&node->ss, RelationGetDescr(currentRelation));
}
/* ----------------------------------------------------------------
* ExecWorkTableScan(node)
*
* Scans the worktable sequentially and returns the next qualifying tuple.
* We call the ExecScan() routine and pass it the appropriate
* access method functions.
* ----------------------------------------------------------------
*/
static TupleTableSlot *
ExecWorkTableScan(PlanState *pstate)
{
WorkTableScanState *node = castNode(WorkTableScanState, pstate);
/*
* On the first call, find the ancestor RecursiveUnion's state via the
* Param slot reserved for it. (We can't do this during node init because
* there are corner cases where we'll get the init call before the
* RecursiveUnion does.)
*/
if (node->rustate == NULL)
{
WorkTableScan *plan = (WorkTableScan *) node->ss.ps.plan;
EState *estate = node->ss.ps.state;
ParamExecData *param;
param = &(estate->es_param_exec_vals[plan->wtParam]);
Assert(param->execPlan == NULL);
Assert(!param->isnull);
node->rustate = castNode(RecursiveUnionState, DatumGetPointer(param->value));
Assert(node->rustate);
/*
* The scan tuple type (ie, the rowtype we expect to find in the work
* table) is the same as the result rowtype of the ancestor
* RecursiveUnion node. Note this depends on the assumption that
* RecursiveUnion doesn't allow projection.
*/
ExecAssignScanType(&node->ss,
ExecGetResultType(&node->rustate->ps));
/*
* Now we can initialize the projection info. This must be completed
* before we can call ExecScan().
*/
ExecAssignScanProjectionInfo(&node->ss);
}
return ExecScan(&node->ss,
(ExecScanAccessMtd) WorkTableScanNext,
(ExecScanRecheckMtd) WorkTableScanRecheck);
}
/*
* DynamicScan_UpdateScanStateForNewPart
* Updates ScanState properties for a new part
*/
static void
DynamicScan_UpdateScanStateForNewPart(ScanState *scanState, Relation newRelation)
{
scanState->ss_currentRelation = newRelation;
ExecAssignScanType(scanState, RelationGetDescr(newRelation));
Oid newOid = RelationGetRelid(newRelation);
/*
* Inside ExecInitScanTupleSlot() we set the tuple table slot's oid
* to range table entry's relid, which for partitioned table always set
* to parent table's oid. In queries where we need to read table oids
* (MPP-20736) we use the tuple table slot's saved oid (refer to slot_getsysattr()).
* This wrongly returns parent oid, instead of partition oid. Therefore,
* to return correct partition oid, we need to update
* our tuple table slot's oid to reflect the partition oid.
*/
scanState->ss_ScanTupleSlot->tts_tableOid = newOid;
scanState->tableType = getTableType(scanState->ss_currentRelation);
}
/*
* InitScanStateRelationDetails
* Opens a relation and sets various relation specific ScanState fields.
*/
void
InitScanStateRelationDetails(ScanState *scanState, Plan *plan, EState *estate)
{
Assert(NULL != scanState);
PlanState *planState = &scanState->ps;
/* Initialize child expressions */
planState->targetlist = (List *)ExecInitExpr((Expr *)plan->targetlist, planState);
planState->qual = (List *)ExecInitExpr((Expr *)plan->qual, planState);
Relation currentRelation = ExecOpenScanRelation(estate, ((Scan *)plan)->scanrelid);
scanState->ss_currentRelation = currentRelation;
if (RelationIsAoRows(currentRelation) || RelationIsParquet(currentRelation))
{
scanState->splits = GetFileSplitsOfSegment(estate->es_plannedstmt->scantable_splits,
currentRelation->rd_id, GetQEIndex());
}
ExecAssignScanType(scanState, RelationGetDescr(currentRelation));
ExecAssignScanProjectionInfo(scanState);
scanState->tableType = getTableType(scanState->ss_currentRelation);
}
/* ----------------------------------------------------------------
* 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;
}
/* ----------------------------------------------------------------
* 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. Also, if planner
* left anything in subrtable, it's fishy.
*/
Assert(outerPlan(node) == NULL);
Assert(innerPlan(node) == NULL);
Assert(node->subrtable == NIL);
/*
* Since subquery nodes create its own executor state,
* and pass it down to its child nodes, we always
* initialize the subquery node. However, some
* fields are not initialized if not necessary, see
* below.
*/
/*
* 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);
/* Check if targetlist or qual contains a var node referencing the ctid column */
subquerystate->cdb_want_ctid = contain_ctid_var_reference(&node->scan);
ItemPointerSetInvalid(&subquerystate->cdb_fake_ctid);
#define SUBQUERYSCAN_NSLOTS 2
/*
* tuple table initialization
*/
ExecInitResultTupleSlot(estate, &subquerystate->ss.ps);
ExecInitScanTupleSlot(estate, &subquerystate->ss);
/*
* initialize subquery
*/
subquerystate->subplan = ExecInitNode(node->subplan, estate, eflags);
/* return borrowed share node list */
estate->es_sharenode = estate->es_sharenode;
/*subquerystate->ss.ps.ps_TupFromTlist = false;*/
/*
* Initialize scan tuple type (needed by ExecAssignScanProjectionInfo)
*/
ExecAssignScanType(&subquerystate->ss,
ExecGetResultType(subquerystate->subplan));
/*
* Initialize result tuple type and projection info.
*/
ExecAssignResultTypeFromTL(&subquerystate->ss.ps);
ExecAssignScanProjectionInfo(&subquerystate->ss);
initGpmonPktForSubqueryScan((Plan *)node, &subquerystate->ss.ps.gpmon_pkt, estate);
return subquerystate;
}
/*
* This function initializes a part and returns true if a new index has been prepared for scanning.
*/
static bool
initNextIndexToScan(DynamicIndexScanState *node)
{
IndexScanState *indexState = &(node->indexScanState);
DynamicIndexScan *dynamicIndexScan = (DynamicIndexScan *)node->indexScanState.ss.ps.plan;
/* Load new index when the scanning of the previous index is done. */
if (indexState->ss.scan_state == SCAN_INIT ||
indexState->ss.scan_state == SCAN_DONE)
{
/* This is the oid of a partition of the table (*not* index) */
Oid *pid = hash_seq_search(&node->pidxStatus);
if (pid == NULL)
{
/* Return if all parts have been scanned. */
node->shouldCallHashSeqTerm = false;
return false;
}
/* Collect number of partitions scanned in EXPLAIN ANALYZE */
if(NULL != indexState->ss.ps.instrument)
{
Instrumentation *instr = indexState->ss.ps.instrument;
instr->numPartScanned ++;
}
DynamicIndexScan_ReMapColumns(node, *pid);
/*
* The is the oid of the partition of an *index*. Note: a partitioned table
* has a root and a set of partitions (may be multi-level). An index
* on a partitioned table also has a root and a set of index partitions.
* We started at table level, and now we are fetching the oid of an index
* partition.
*/
Oid pindex = getPhysicalIndexRelid(dynamicIndexScan->logicalIndexInfo,
*pid);
Assert(OidIsValid(pindex));
Relation currentRelation = OpenScanRelationByOid(*pid);
indexState->ss.ss_currentRelation = currentRelation;
for (int i=0; i < DYNAMICINDEXSCAN_NSLOTS; i++)
{
indexState->ss.ss_ScanTupleSlot[i].tts_tableOid = *pid;
}
ExecAssignScanType(&indexState->ss, RelationGetDescr(currentRelation));
ScanState *scanState = (ScanState *)node;
MemoryContextReset(node->partitionMemoryContext);
MemoryContext oldCxt = MemoryContextSwitchTo(node->partitionMemoryContext);
/* Initialize child expressions */
scanState->ps.qual = (List *)ExecInitExpr((Expr *)scanState->ps.plan->qual, (PlanState*)scanState);
scanState->ps.targetlist = (List *)ExecInitExpr((Expr *)scanState->ps.plan->targetlist, (PlanState*)scanState);
ExecAssignScanProjectionInfo(scanState);
EState *estate = indexState->ss.ps.state;
indexState->iss_RelationDesc =
OpenIndexRelation(estate, pindex, *pid);
/*
* build the index scan keys from the index qualification
*/
ExecIndexBuildScanKeys((PlanState *) indexState,
indexState->iss_RelationDesc,
dynamicIndexScan->indexqual,
dynamicIndexScan->indexstrategy,
dynamicIndexScan->indexsubtype,
&indexState->iss_ScanKeys,
&indexState->iss_NumScanKeys,
&indexState->iss_RuntimeKeys,
&indexState->iss_NumRuntimeKeys,
NULL,
NULL);
MemoryContextSwitchTo(oldCxt);
ExprContext *econtext = indexState->iss_RuntimeContext; /* context for runtime keys */
if (indexState->iss_NumRuntimeKeys != 0)
{
ExecIndexEvalRuntimeKeys(econtext,
indexState->iss_RuntimeKeys,
indexState->iss_NumRuntimeKeys);
}
indexState->iss_RuntimeKeysReady = true;
/*
* Initialize result tuple type and projection info.
*/
TupleDesc td = indexState->ss.ps.ps_ResultTupleSlot->tts_tupleDescriptor;
if (td)
{
pfree(td);
td = NULL;
}
ExecAssignResultTypeFromTL(&indexState->ss.ps);
ExecAssignScanProjectionInfo(&indexState->ss);
indexState->iss_ScanDesc = index_beginscan(currentRelation,
indexState->iss_RelationDesc,
estate->es_snapshot,
indexState->iss_NumScanKeys,
indexState->iss_ScanKeys);
indexState->ss.scan_state = SCAN_SCAN;
}
return true;
}
/* ----------------------------------------------------------------
* ExecInitForeignScan
* ----------------------------------------------------------------
*/
foreign_ss *
ExecInitForeignScan(foreign_scan_sc *node, exec_state_n *estate, int eflags)
{
foreign_ss* scanstate;
struct relation* currentRelation;
FdwRoutine *fdwroutine;
/* check for unsupported flags */
ASSERT(!(eflags & (EXEC_FLAG_BACKWARD | EXEC_FLAG_MARK)));
/*
* create state structure
*/
scanstate = MK_N(ForeignScanState,foreign_ss);
scanstate->ss.ps.plan = (plan_n *) 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 = (struct list *) exec_init_expr(
(expr_n *) node->scan.plan.targetlist,
(plan_state_n *) scanstate);
scanstate->ss.ps.qual = (struct list *) exec_init_expr(
(expr_n *) node->scan.plan.qual,
(plan_state_n *) scanstate);
/*
* tuple table initialization
*/
exec_init_result_tupslot(estate, &scanstate->ss.ps);
exec_init_scan_tupslot(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, REL_DESC(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(REL_ID(currentRelation));
scanstate->fdwroutine = fdwroutine;
scanstate->fdw_state = NULL;
/*
* Tell the FDW to initiate the scan.
*/
fdwroutine->BeginForeignScan(scanstate, eflags);
return scanstate;
}
/* ----------------------------------------------------------------
* ExecInitFunctionScan
* ----------------------------------------------------------------
*/
FunctionScanState *
ExecInitFunctionScan(FunctionScan *node, EState *estate, int eflags)
{
FunctionScanState *scanstate;
RangeTblEntry *rte;
Oid funcrettype;
TypeFuncClass functypclass;
TupleDesc tupdesc = NULL;
/*
* FunctionScan should not have any children.
*/
Assert(outerPlan(node) == NULL);
Assert(innerPlan(node) == NULL);
/*
* create new ScanState for node
*/
scanstate = makeNode(FunctionScanState);
scanstate->ss.ps.plan = (Plan *) node;
scanstate->ss.ps.state = estate;
/*
* Miscellaneous initialization
*
* create expression context for node
*/
ExecAssignExprContext(estate, &scanstate->ss.ps);
#define FUNCTIONSCAN_NSLOTS 2
/*
* tuple table initialization
*/
ExecInitResultTupleSlot(estate, &scanstate->ss.ps);
ExecInitScanTupleSlot(estate, &scanstate->ss);
/*
* 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);
/* Check if targetlist or qual contains a var node referencing the ctid column */
scanstate->cdb_want_ctid = contain_ctid_var_reference(&node->scan);
ItemPointerSet(&scanstate->cdb_fake_ctid, 0, 0);
ItemPointerSet(&scanstate->cdb_mark_ctid, 0, 0);
/*
* get info about function
*/
rte = rt_fetch(node->scan.scanrelid, estate->es_range_table);
Assert(rte->rtekind == RTE_FUNCTION);
/*
* Now determine if the function returns a simple or composite type, and
* build an appropriate tupdesc.
*/
functypclass = get_expr_result_type(rte->funcexpr,
&funcrettype,
&tupdesc);
if (functypclass == TYPEFUNC_COMPOSITE)
{
/* Composite data type, e.g. a table's row type */
Assert(tupdesc);
/* Must copy it out of typcache for safety */
tupdesc = CreateTupleDescCopy(tupdesc);
}
else if (functypclass == TYPEFUNC_SCALAR)
{
/* Base data type, i.e. scalar */
char *attname = strVal(linitial(rte->eref->colnames));
tupdesc = CreateTemplateTupleDesc(1, false);
TupleDescInitEntry(tupdesc,
(AttrNumber) 1,
attname,
funcrettype,
-1,
0);
}
else if (functypclass == TYPEFUNC_RECORD)
{
tupdesc = BuildDescFromLists(rte->eref->colnames,
rte->funccoltypes,
rte->funccoltypmods);
}
else
{
/* crummy error message, but parser should have caught this */
elog(ERROR, "function in FROM has unsupported return type");
}
/*
* For RECORD results, make sure a typmod has been assigned. (The
* function should do this for itself, but let's cover things in case it
* doesn't.)
*/
BlessTupleDesc(tupdesc);
scanstate->tupdesc = tupdesc;
ExecAssignScanType(&scanstate->ss, tupdesc);
/*
* Other node-specific setup
*/
scanstate->tuplestorestate = NULL;
scanstate->funcexpr = ExecInitExpr((Expr *) rte->funcexpr,
(PlanState *) scanstate);
/*
* Initialize result tuple type and projection info.
*/
ExecAssignResultTypeFromTL(&scanstate->ss.ps);
ExecAssignScanProjectionInfo(&scanstate->ss);
initGpmonPktForFunctionScan((Plan *)node, &scanstate->ss.ps.gpmon_pkt, estate);
if (gp_resqueue_memory_policy != RESQUEUE_MEMORY_POLICY_NONE)
{
SPI_ReserveMemory(((Plan *)node)->operatorMemKB * 1024L);
}
return scanstate;
}
/* ----------------------------------------------------------------
* ExecInitBitmapHeapScan
*
* Initializes the scan's state information.
* ----------------------------------------------------------------
*/
BitmapHeapScanState *
ExecInitBitmapHeapScan(BitmapHeapScan *node, EState *estate, int eflags)
{
BitmapHeapScanState *scanstate;
Relation currentRelation;
/* 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->tbm = NULL;
scanstate->tbmiterator = NULL;
scanstate->tbmres = NULL;
scanstate->prefetch_iterator = NULL;
scanstate->prefetch_pages = 0;
scanstate->prefetch_target = 0;
/*
* 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);
scanstate->bitmapqualorig = (List *)
ExecInitExpr((Expr *) 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);
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;
}
/* ----------------------------------------------------------------
* ExecInitExternalScan
* ----------------------------------------------------------------
*/
ExternalScanState *
ExecInitExternalScan(ExternalScan *node, EState *estate, int eflags)
{
ResultRelSegFileInfo *segfileinfo = NULL;
ExternalScanState *externalstate;
Relation currentRelation;
FileScanDesc currentScanDesc;
Assert(outerPlan(node) == NULL);
Assert(innerPlan(node) == NULL);
/*
* create state structure
*/
externalstate = makeNode(ExternalScanState);
externalstate->ss.ps.plan = (Plan *) node;
externalstate->ss.ps.state = estate;
/*
* Miscellaneous initialization
*
* create expression context for node
*/
ExecAssignExprContext(estate, &externalstate->ss.ps);
/*
* initialize child expressions
*/
externalstate->ss.ps.targetlist = (List *)
ExecInitExpr((Expr *) node->scan.plan.targetlist,
(PlanState *) externalstate);
externalstate->ss.ps.qual = (List *)
ExecInitExpr((Expr *) node->scan.plan.qual,
(PlanState *) externalstate);
/* Check if targetlist or qual contains a var node referencing the ctid column */
externalstate->cdb_want_ctid = contain_ctid_var_reference(&node->scan);
ItemPointerSetInvalid(&externalstate->cdb_fake_ctid);
#define EXTSCAN_NSLOTS 2
/*
* tuple table initialization
*/
ExecInitResultTupleSlot(estate, &externalstate->ss.ps);
ExecInitScanTupleSlot(estate, &externalstate->ss);
/*
* get the relation object id from the relid'th entry in the range table
* and open that relation.
*/
currentRelation = ExecOpenScanExternalRelation(estate, node->scan.scanrelid);
if (Gp_role == GP_ROLE_EXECUTE && node->err_aosegfileinfos)
{
segfileinfo = (ResultRelSegFileInfo *)list_nth(node->err_aosegfileinfos, GetQEIndex());
}
else
{
segfileinfo = NULL;
}
currentScanDesc = external_beginscan(currentRelation,
node->scan.scanrelid,
node->scancounter,
node->uriList,
node->fmtOpts,
node->fmtType,
node->isMasterOnly,
node->rejLimit,
node->rejLimitInRows,
node->fmterrtbl,
segfileinfo,
node->encoding,
node->scan.plan.qual);
externalstate->ss.ss_currentRelation = currentRelation;
externalstate->ess_ScanDesc = currentScanDesc;
ExecAssignScanType(&externalstate->ss, RelationGetDescr(currentRelation));
/*
* Initialize result tuple type and projection info.
*/
ExecAssignResultTypeFromTL(&externalstate->ss.ps);
ExecAssignScanProjectionInfo(&externalstate->ss);
/*
* If eflag contains EXEC_FLAG_REWIND or EXEC_FLAG_BACKWARD or EXEC_FLAG_MARK,
* then this node is not eager free safe.
*/
externalstate->ss.ps.delayEagerFree =
((eflags & (EXEC_FLAG_REWIND | EXEC_FLAG_BACKWARD | EXEC_FLAG_MARK)) != 0);
initGpmonPktForExternalScan((Plan *)node, &externalstate->ss.ps.gpmon_pkt, estate);
return externalstate;
}
/* ----------------------------------------------------------------
* ExecInitFunctionScan
* ----------------------------------------------------------------
*/
FunctionScanState *
ExecInitFunctionScan(FunctionScan *node, EState *estate, int eflags)
{
FunctionScanState *scanstate;
Oid funcrettype;
TypeFuncClass functypclass;
TupleDesc tupdesc = NULL;
/* check for unsupported flags */
Assert(!(eflags & EXEC_FLAG_MARK));
/*
* FunctionScan should not have any children.
*/
Assert(outerPlan(node) == NULL);
Assert(innerPlan(node) == NULL);
/*
* create new ScanState for node
*/
scanstate = makeNode(FunctionScanState);
scanstate->ss.ps.plan = (Plan *) node;
scanstate->ss.ps.state = estate;
scanstate->eflags = eflags;
/*
* Miscellaneous initialization
*
* create expression context for node
*/
ExecAssignExprContext(estate, &scanstate->ss.ps);
/*
* tuple table initialization
*/
ExecInitResultTupleSlot(estate, &scanstate->ss.ps);
ExecInitScanTupleSlot(estate, &scanstate->ss);
/*
* 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);
/*
* Now determine if the function returns a simple or composite type, and
* build an appropriate tupdesc.
*/
functypclass = get_expr_result_type(node->funcexpr,
&funcrettype,
&tupdesc);
if (functypclass == TYPEFUNC_COMPOSITE)
{
/* Composite data type, e.g. a table's row type */
Assert(tupdesc);
/* Must copy it out of typcache for safety */
tupdesc = CreateTupleDescCopy(tupdesc);
}
else if (functypclass == TYPEFUNC_SCALAR)
{
/* Base data type, i.e. scalar */
char *attname = strVal(linitial(node->funccolnames));
tupdesc = CreateTemplateTupleDesc(1, false);
TupleDescInitEntry(tupdesc,
(AttrNumber) 1,
attname,
funcrettype,
-1,
0);
}
else if (functypclass == TYPEFUNC_RECORD)
{
tupdesc = BuildDescFromLists(node->funccolnames,
node->funccoltypes,
node->funccoltypmods);
}
else
{
/* crummy error message, but parser should have caught this */
elog(ERROR, "function in FROM has unsupported return type");
}
/*
* For RECORD results, make sure a typmod has been assigned. (The
* function should do this for itself, but let's cover things in case it
* doesn't.)
*/
BlessTupleDesc(tupdesc);
scanstate->tupdesc = tupdesc;
ExecAssignScanType(&scanstate->ss, tupdesc);
/*
* Other node-specific setup
*/
scanstate->tuplestorestate = NULL;
scanstate->funcexpr = ExecInitExpr((Expr *) node->funcexpr,
(PlanState *) scanstate);
scanstate->ss.ps.ps_TupFromTlist = false;
/*
* Initialize result tuple type and projection info.
*/
ExecAssignResultTypeFromTL(&scanstate->ss.ps);
ExecAssignScanProjectionInfo(&scanstate->ss);
return scanstate;
}
/* ----------------------------------------------------------------
* 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;
}
/* ----------------------------------------------------------------
* 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;
}
/* ----------------------------------------------------------------
* ExecInitForeignScan
* ----------------------------------------------------------------
*/
ForeignScanState *
ExecInitForeignScan(ForeignScan *node, EState *estate, int eflags)
{
ForeignScanState *scanstate;
Relation currentRelation = NULL;
Index scanrelid = node->scan.scanrelid;
Index tlistvarno;
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);
scanstate->fdw_recheck_quals = (List *)
ExecInitExpr((Expr *) node->fdw_recheck_quals,
(PlanState *) scanstate);
/*
* tuple table initialization
*/
ExecInitResultTupleSlot(estate, &scanstate->ss.ps);
ExecInitScanTupleSlot(estate, &scanstate->ss);
/*
* open the base relation, if any, and acquire an appropriate lock on it;
* also acquire function pointers from the FDW's handler
*/
if (scanrelid > 0)
{
currentRelation = ExecOpenScanRelation(estate, scanrelid, eflags);
scanstate->ss.ss_currentRelation = currentRelation;
fdwroutine = GetFdwRoutineForRelation(currentRelation, true);
}
else
{
/* We can't use the relcache, so get fdwroutine the hard way */
fdwroutine = GetFdwRoutineByServerId(node->fs_server);
}
/*
* Determine the scan tuple type. If the FDW provided a targetlist
* describing the scan tuples, use that; else use base relation's rowtype.
*/
if (node->fdw_scan_tlist != NIL || currentRelation == NULL)
{
TupleDesc scan_tupdesc;
scan_tupdesc = ExecTypeFromTL(node->fdw_scan_tlist, false);
ExecAssignScanType(&scanstate->ss, scan_tupdesc);
/* Node's targetlist will contain Vars with varno = INDEX_VAR */
tlistvarno = INDEX_VAR;
}
else
{
ExecAssignScanType(&scanstate->ss, RelationGetDescr(currentRelation));
/* Node's targetlist will contain Vars with varno = scanrelid */
tlistvarno = scanrelid;
}
/*
* Initialize result tuple type and projection info.
*/
ExecAssignResultTypeFromTL(&scanstate->ss.ps);
ExecAssignScanProjectionInfoWithVarno(&scanstate->ss, tlistvarno);
/*
* Initialize FDW-related state.
*/
scanstate->fdwroutine = fdwroutine;
scanstate->fdw_state = NULL;
/* Initialize any outer plan. */
if (outerPlan(node))
outerPlanState(scanstate) =
ExecInitNode(outerPlan(node), estate, eflags);
/*
* Tell the FDW to initialize the scan.
*/
fdwroutine->BeginForeignScan(scanstate, eflags);
return scanstate;
}
/*
* initNextTableToScan
* Find the next table to scan and initiate the scan if the previous table
* is finished.
*
* If scanning on the current table is not finished, or a new table is found,
* this function returns true.
* If no more table is found, this function returns false.
*/
static bool
initNextTableToScan(DynamicTableScanState *node)
{
ScanState *scanState = (ScanState *)node;
if (scanState->scan_state == SCAN_INIT ||
scanState->scan_state == SCAN_DONE)
{
Oid *pid = hash_seq_search(&node->pidStatus);
if (pid == NULL)
{
node->shouldCallHashSeqTerm = false;
return false;
}
/* Collect number of partitions scanned in EXPLAIN ANALYZE */
if (NULL != scanState->ps.instrument)
{
Instrumentation *instr = scanState->ps.instrument;
instr->numPartScanned ++;
}
/*
* Inside ExecInitScanTupleSlot() we set the tuple table slot's oid
* to range table entry's relid, which for partitioned table always set
* to parent table's oid. In queries where we need to read table oids
* (MPP-20736) we use the tuple table slot's saved oid (refer to slot_getsysattr()).
* This wrongly returns parent oid, instead of partition oid. Therefore,
* to return correct partition oid, we need to update
* our tuple table slot's oid to reflect the partition oid.
*/
scanState->ss_ScanTupleSlot->tts_tableOid = *pid;
scanState->ss_currentRelation = OpenScanRelationByOid(*pid);
Relation lastScannedRel = OpenScanRelationByOid(node->lastRelOid);
TupleDesc lastTupDesc = RelationGetDescr(lastScannedRel);
CloseScanRelation(lastScannedRel);
TupleDesc partTupDesc = RelationGetDescr(scanState->ss_currentRelation);
ExecAssignScanType(scanState, partTupDesc);
AttrNumber *attMap = NULL;
attMap = varattnos_map(lastTupDesc, partTupDesc);
/* If attribute remapping is not necessary, then do not change the varattno */
if (attMap)
{
change_varattnos_of_a_varno((Node*)scanState->ps.plan->qual, attMap, node->scanrelid);
change_varattnos_of_a_varno((Node*)scanState->ps.plan->targetlist, attMap, node->scanrelid);
/*
* Now that the varattno mapping has been changed, change the relation that
* the new varnos correspond to
*/
node->lastRelOid = *pid;
}
/*
* For the very first partition, the targetlist of planstate is set to null. So, we must
* initialize quals and targetlist, regardless of remapping requirements. For later
* partitions, we only initialize quals and targetlist if a column re-mapping is necessary.
*/
if (attMap || node->firstPartition)
{
node->firstPartition = false;
MemoryContextReset(node->partitionMemoryContext);
MemoryContext oldCxt = MemoryContextSwitchTo(node->partitionMemoryContext);
/* Initialize child expressions */
scanState->ps.qual = (List *)ExecInitExpr((Expr *)scanState->ps.plan->qual, (PlanState*)scanState);
scanState->ps.targetlist = (List *)ExecInitExpr((Expr *)scanState->ps.plan->targetlist, (PlanState*)scanState);
MemoryContextSwitchTo(oldCxt);
}
if (attMap)
{
pfree(attMap);
}
ExecAssignScanProjectionInfo(scanState);
scanState->tableType = getTableType(scanState->ss_currentRelation);
BeginTableScanRelation(scanState);
}
return true;
}
/* ----------------------------------------------------------------
* 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;
/*
* 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);
/*
* tuple table initialization
*/
ExecInitResultTupleSlot(estate, &subquerystate->ss.ps);
ExecInitScanTupleSlot(estate, &subquerystate->ss);
/*
* initialize subquery
*/
subquerystate->subplan = ExecInitNode(node->subplan, estate, eflags);
subquerystate->ss.ps.ps_TupFromTlist = false;
/*
* Initialize scan tuple type (needed by ExecAssignScanProjectionInfo)
*/
ExecAssignScanType(&subquerystate->ss,
ExecGetResultType(subquerystate->subplan));
/*
* Initialize result tuple type and projection info.
*/
ExecAssignResultTypeFromTL(&subquerystate->ss.ps);
ExecAssignScanProjectionInfo(&subquerystate->ss);
return subquerystate;
}
/* ----------------------------------------------------------------
* ExecInitBitmapHeapScan
*
* Initializes the scan's state information.
* ----------------------------------------------------------------
*/
BitmapHeapScanState *
ExecInitBitmapHeapScan(BitmapHeapScan *node, EState *estate, int eflags)
{
BitmapHeapScanState *scanstate;
Relation currentRelation;
/* 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->tbm = NULL;
scanstate->tbmres = NULL;
/*
* 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);
scanstate->bitmapqualorig = (List *)
ExecInitExpr((Expr *) node->bitmapqualorig,
(PlanState *) scanstate);
#define BITMAPHEAPSCAN_NSLOTS 2
/*
* 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;
/*
* Even though we aren't going to do a conventional seqscan, it is useful
* to create a HeapScanDesc --- this checks the relation size and sets up
* statistical infrastructure for us.
*/
scanstate->ss.ss_currentScanDesc = heap_beginscan(currentRelation,
estate->es_snapshot,
0,
NULL);
/*
* One problem is that heap_beginscan counts a "sequential scan" start,
* when we actually aren't doing any such thing. Reverse out the added
* scan count. (Eventually we may want to count bitmap scans separately.)
*/
pgstat_discount_heap_scan(&scanstate->ss.ss_currentScanDesc->rs_pgstat_info);
/*
* 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;
}
/* ------------------------------------------------------------------
* ExecInitShareInputScan
* ------------------------------------------------------------------
*/
ShareInputScanState *
ExecInitShareInputScan(ShareInputScan *node, EState *estate, int eflags)
{
ShareInputScanState *sisstate;
Plan *outerPlan;
TupleDesc tupDesc;
Assert(innerPlan(node) == NULL);
/* create state data structure */
sisstate = makeNode(ShareInputScanState);
sisstate->ss.ps.plan = (Plan *) node;
sisstate->ss.ps.state = estate;
sisstate->ts_state = NULL;
sisstate->ts_pos = NULL;
sisstate->ts_markpos = NULL;
sisstate->share_lk_ctxt = NULL;
sisstate->freed = false;
/*
* init child node.
* if outerPlan is NULL, this is no-op (so that the ShareInput node will be
* only init-ed once).
*/
outerPlan = outerPlan(node);
outerPlanState(sisstate) = ExecInitNode(outerPlan, estate, eflags);
sisstate->ss.ps.targetlist = (List *)
ExecInitExpr((Expr *) node->plan.targetlist, (PlanState *) sisstate);
Assert(node->plan.qual == NULL);
sisstate->ss.ps.qual = NULL;
/* Misc initialization
*
* Create expression context
*/
ExecAssignExprContext(estate, &sisstate->ss.ps);
/* tuple table init */
ExecInitResultTupleSlot(estate, &sisstate->ss.ps);
sisstate->ss.ss_ScanTupleSlot = ExecInitExtraTupleSlot(estate);
/*
* init tuple type.
*/
ExecAssignResultTypeFromTL(&sisstate->ss.ps);
{
bool hasoid;
if (!ExecContextForcesOids(&sisstate->ss.ps, &hasoid))
hasoid = false;
tupDesc = ExecTypeFromTL(node->plan.targetlist, hasoid);
}
ExecAssignScanType(&sisstate->ss, tupDesc);
sisstate->ss.ps.ps_ProjInfo = NULL;
/*
* If this is an intra-slice share node, increment reference count to
* tell the underlying node not to be freed before this node is ready to
* be freed. fCreate flag to ExecGetShareNodeEntry is true because
* at this point we don't have the entry which will be initialized in
* the underlying node initialization later.
*/
if (node->share_type == SHARE_MATERIAL || node->share_type == SHARE_SORT)
{
ShareNodeEntry *snEntry = ExecGetShareNodeEntry(estate, node->share_id, true);
snEntry->refcount++;
}
initGpmonPktForShareInputScan((Plan *)node, &sisstate->ss.ps.gpmon_pkt, estate);
return sisstate;
}
/* ----------------------------------------------------------------
* 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;
}
CustomScanState *
ExecInitCustomScan(CustomScan *cscan, EState *estate, int eflags)
{
CustomScanState *css;
Relation scan_rel = NULL;
Index scanrelid = cscan->scan.scanrelid;
Index tlistvarno;
/*
* Allocate the CustomScanState object. We let the custom scan provider
* do the palloc, in case it wants to make a larger object that embeds
* CustomScanState as the first field. It must set the node tag and the
* methods field correctly at this time. Other standard fields should be
* set to zero.
*/
css = (CustomScanState *) cscan->methods->CreateCustomScanState(cscan);
Assert(IsA(css, CustomScanState));
/* ensure flags is filled correctly */
css->flags = cscan->flags;
/* fill up fields of ScanState */
css->ss.ps.plan = &cscan->scan.plan;
css->ss.ps.state = estate;
/* create expression context for node */
ExecAssignExprContext(estate, &css->ss.ps);
#ifdef PG95
css->ss.ps.ps_TupFromTlist = false;
#endif
/* initialize child expressions */
css->ss.ps.targetlist = (List *)
ExecInitExpr((Expr *) cscan->scan.plan.targetlist,
(PlanState *) css);
css->ss.ps.qual = (List *)
ExecInitExpr((Expr *) cscan->scan.plan.qual,
(PlanState *) css);
/* tuple table initialization */
#ifndef PG95
if (((Scan*)css->ss.ps.plan)->scanrelid) {
// For table scans
ExecInitScanTupleSlot(estate, &css->ss);
}
else {
// For tuple-table-slot scans (typically over Motion nodes)
css->ss.ss_ScanTupleSlot = ExecAllocTableSlot(&estate->es_tupleTable);
}
#else
ExecInitScanTupleSlot(estate, &css->ss);
#endif
ExecInitResultTupleSlot(estate, &css->ss.ps);
/*
* open the base relation, if any, and acquire an appropriate lock on it
*/
if (scanrelid > 0)
{
scan_rel = ExecOpenScanRelation(estate
, scanrelid
#ifdef PG95
, eflags
#endif
);
css->ss.ss_currentRelation = scan_rel;
}
/*
* Determine the scan tuple type. If the custom scan provider provided a
* targetlist describing the scan tuples, use that; else use base
* relation's rowtype.
*/
if (cscan->custom_scan_tlist != NIL || scan_rel == NULL)
{
// index-only scan? GP doesn't define INDEX_VAR
TupleDesc scan_tupdesc;
scan_tupdesc = ExecTypeFromTL(cscan->custom_scan_tlist, false);
ExecAssignScanType(&css->ss, scan_tupdesc);
#ifdef PG95
/* Node's targetlist will contain Vars with varno = INDEX_VAR */
tlistvarno = INDEX_VAR;
#endif
}
else
{
ExecAssignScanType(&css->ss, RelationGetDescr(scan_rel));
/* Node's targetlist will contain Vars with varno = scanrelid */
tlistvarno = scanrelid;
}
/*
* Initialize result tuple type and projection info.
*/
ExecAssignResultTypeFromTL(&css->ss.ps);
#ifdef PG95
ExecAssignScanProjectionInfoWithVarno(&css->ss, tlistvarno);
#else
ExecAssignScanProjectionInfo(&css->ss);
#endif
/*
* The callback of custom-scan provider applies the final initialization
* of the custom-scan-state node according to its logic.
*/
css->methods->BeginCustomScan(css, estate, eflags);
return css;
}
/* ----------------------------------------------------------------
* 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;
}
/* ----------------------------------------------------------------
* 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->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;
/*
* 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);
scanstate->bitmapqualorig = (List *)
ExecInitExpr((Expr *) 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;
}
/* ----------------------------------------------------------------
* 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;
}
/* ----------------------------------------------------------------
* ExecInitSubqueryScan
* ----------------------------------------------------------------
*/
subquery_ss*
ExecInitSubqueryScan(subquery_scan_sc *node, exec_state_n *estate, int eflags)
{
subquery_ss *subquerystate;
/* check for unsupported flags */
ASSERT(!(eflags & EXEC_FLAG_MARK));
/*
* subquery_scan_sc should not have any "normal" children. Also, if planner
* left anything in subrtable/subrowmark, it's fishy.
*/
ASSERT(OUTER_PLAN(node) == NULL);
ASSERT(INNER_PLAN(node) == NULL);
ASSERT(node->subrtable == NIL);
ASSERT(node->subrowmark == NIL);
/*
* create state structure
*/
subquerystate = MK_N(SubqueryScanState,subquery_ss);
subquerystate->ss.ps.plan = (plan_n *) 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 = (struct list*) exec_init_expr(
(expr_n*) node->scan.plan.targetlist,
(plan_state_n*) subquerystate);
subquerystate->ss.ps.qual = (struct list*) exec_init_expr(
(expr_n*) node->scan.plan.qual,
(plan_state_n*) subquerystate);
/*
* tuple table initialization
*/
exec_init_result_tupslot(estate, &subquerystate->ss.ps);
exec_init_scan_tupslot(estate, &subquerystate->ss);
/*
* initialize subquery
*/
subquerystate->subplan = exec_init_node(node->subplan, estate, eflags);
subquerystate->ss.ps.ps_TupFromTlist = false;
/*
* Initialize scan tuple type (needed by ExecAssignScanProjectionInfo)
*/
ExecAssignScanType(&subquerystate->ss, exec_get_result_type(subquerystate->subplan));
/*
* Initialize result tuple type and projection info.
*/
ExecAssignResultTypeFromTL(&subquerystate->ss.ps);
ExecAssignScanProjectionInfo(&subquerystate->ss);
return subquerystate;
}