/*
* BeginStreamScan
*/
void
BeginStreamScan(ForeignScanState *node, int eflags)
{
ForeignScan *plan = (ForeignScan *) node->ss.ps.plan;
StreamScanState *state;
ListCell *lc;
List *colnames = (List *) linitial(plan->fdw_private);
List *physical_tlist = (List *) lsecond(plan->fdw_private);
Value *sample_cutoff = (Value *) lthird(plan->fdw_private);
int i = 0;
state = palloc0(sizeof(StreamScanState));
state->pi = palloc(sizeof(StreamProjectionInfo));
state->pi->mcxt = AllocSetContextCreate(CurrentMemoryContext,
"ExecProjectContext",
ALLOCSET_DEFAULT_MINSIZE,
ALLOCSET_DEFAULT_INITSIZE,
ALLOCSET_DEFAULT_MAXSIZE);
state->pi->ecxt = CreateStandaloneExprContext();
state->pi->outdesc = ExecTypeFromTL(physical_tlist, false);
state->pi->indesc = NULL;
state->sample_cutoff = sample_cutoff ? intVal(sample_cutoff) : -1;
Assert(state->pi->outdesc->natts == list_length(colnames));
foreach(lc, colnames)
{
Value *v = (Value *) lfirst(lc);
namestrcpy(&(state->pi->outdesc->attrs[i++]->attname), strVal(v));
}
/* ----------------------------------------------------------------
* 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;
}
/* ----------------
* ExecAssignResultTypeFromTL
* ----------------
*/
void
ExecAssignResultTypeFromTL(PlanState *planstate)
{
bool hasoid;
TupleDesc tupDesc;
if (ExecContextForcesOids(planstate, &hasoid))
{
/* context forces OID choice; hasoid is now set correctly */
}
else
{
/* given free choice, don't leave space for OIDs in result tuples */
hasoid = false;
}
/*
* ExecTypeFromTL needs the parse-time representation of the tlist, not a
* list of ExprStates. This is good because some plan nodes don't bother
* to set up planstate->targetlist ...
*/
tupDesc = ExecTypeFromTL(planstate->plan->targetlist, hasoid);
ExecAssignResultType(planstate, tupDesc);
}
/* ----------------------------------------------------------------
* 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;
}
/* ----------------------------------------------------------------
* ExecInitGather
* ----------------------------------------------------------------
*/
GatherState *
ExecInitGather(Gather *node, EState *estate, int eflags)
{
GatherState *gatherstate;
Plan *outerNode;
bool hasoid;
TupleDesc tupDesc;
/* Gather node doesn't have innerPlan node. */
Assert(innerPlan(node) == NULL);
/*
* create state structure
*/
gatherstate = makeNode(GatherState);
gatherstate->ps.plan = (Plan *) node;
gatherstate->ps.state = estate;
gatherstate->need_to_scan_locally = !node->single_copy;
/*
* Miscellaneous initialization
*
* create expression context for node
*/
ExecAssignExprContext(estate, &gatherstate->ps);
/*
* initialize child expressions
*/
gatherstate->ps.targetlist = (List *)
ExecInitExpr((Expr *) node->plan.targetlist,
(PlanState *) gatherstate);
gatherstate->ps.qual = (List *)
ExecInitExpr((Expr *) node->plan.qual,
(PlanState *) gatherstate);
/*
* tuple table initialization
*/
gatherstate->funnel_slot = ExecInitExtraTupleSlot(estate);
ExecInitResultTupleSlot(estate, &gatherstate->ps);
/*
* now initialize outer plan
*/
outerNode = outerPlan(node);
outerPlanState(gatherstate) = ExecInitNode(outerNode, estate, eflags);
gatherstate->ps.ps_TupFromTlist = false;
/*
* Initialize result tuple type and projection info.
*/
ExecAssignResultTypeFromTL(&gatherstate->ps);
ExecAssignProjectionInfo(&gatherstate->ps, NULL);
/*
* Initialize funnel slot to same tuple descriptor as outer plan.
*/
if (!ExecContextForcesOids(&gatherstate->ps, &hasoid))
hasoid = false;
tupDesc = ExecTypeFromTL(outerNode->targetlist, hasoid);
ExecSetSlotDescriptor(gatherstate->funnel_slot, tupDesc);
return gatherstate;
}
/* ------------------------------------------------------------------
* 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;
}
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;
}
/* ----------------------------------------------------------------
* 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;
}
/* ----------------------------------------------------------------
* ExecInitGather
* ----------------------------------------------------------------
*/
GatherState *
ExecInitGather(Gather *node, EState *estate, int eflags)
{
GatherState *gatherstate;
Plan *outerNode;
bool hasoid;
TupleDesc tupDesc;
/* Gather node doesn't have innerPlan node. */
Assert(innerPlan(node) == NULL);
/*
* create state structure
*/
gatherstate = makeNode(GatherState);
gatherstate->ps.plan = (Plan *) node;
gatherstate->ps.state = estate;
gatherstate->ps.ExecProcNode = ExecGather;
gatherstate->initialized = false;
gatherstate->need_to_scan_locally =
!node->single_copy && parallel_leader_participation;
gatherstate->tuples_needed = -1;
/*
* Miscellaneous initialization
*
* create expression context for node
*/
ExecAssignExprContext(estate, &gatherstate->ps);
/*
* Gather doesn't support checking a qual (it's always more efficient to
* do it in the child node).
*/
Assert(!node->plan.qual);
/*
* tuple table initialization
*/
gatherstate->funnel_slot = ExecInitExtraTupleSlot(estate);
ExecInitResultTupleSlot(estate, &gatherstate->ps);
/*
* now initialize outer plan
*/
outerNode = outerPlan(node);
outerPlanState(gatherstate) = ExecInitNode(outerNode, estate, eflags);
/*
* Initialize funnel slot to same tuple descriptor as outer plan.
*/
if (!ExecContextForcesOids(outerPlanState(gatherstate), &hasoid))
hasoid = false;
tupDesc = ExecTypeFromTL(outerNode->targetlist, hasoid);
ExecSetSlotDescriptor(gatherstate->funnel_slot, tupDesc);
/*
* Initialize result tuple type and projection info.
*/
ExecAssignResultTypeFromTL(&gatherstate->ps);
ExecConditionalAssignProjectionInfo(&gatherstate->ps, tupDesc, OUTER_VAR);
return gatherstate;
}
/* ----------------------------------------------------------------
* ExecInitGather
* ----------------------------------------------------------------
*/
GatherMergeState *
ExecInitGatherMerge(GatherMerge *node, EState *estate, int eflags)
{
GatherMergeState *gm_state;
Plan *outerNode;
bool hasoid;
TupleDesc tupDesc;
/* Gather merge node doesn't have innerPlan node. */
Assert(innerPlan(node) == NULL);
/*
* create state structure
*/
gm_state = makeNode(GatherMergeState);
gm_state->ps.plan = (Plan *) node;
gm_state->ps.state = estate;
gm_state->ps.ExecProcNode = ExecGatherMerge;
/*
* Miscellaneous initialization
*
* create expression context for node
*/
ExecAssignExprContext(estate, &gm_state->ps);
/*
* initialize child expressions
*/
gm_state->ps.qual =
ExecInitQual(node->plan.qual, &gm_state->ps);
/*
* tuple table initialization
*/
ExecInitResultTupleSlot(estate, &gm_state->ps);
/*
* now initialize outer plan
*/
outerNode = outerPlan(node);
outerPlanState(gm_state) = ExecInitNode(outerNode, estate, eflags);
/*
* Initialize result tuple type and projection info.
*/
ExecAssignResultTypeFromTL(&gm_state->ps);
ExecAssignProjectionInfo(&gm_state->ps, NULL);
gm_state->gm_initialized = false;
/*
* initialize sort-key information
*/
if (node->numCols)
{
int i;
gm_state->gm_nkeys = node->numCols;
gm_state->gm_sortkeys =
palloc0(sizeof(SortSupportData) * node->numCols);
for (i = 0; i < node->numCols; i++)
{
SortSupport sortKey = gm_state->gm_sortkeys + i;
sortKey->ssup_cxt = CurrentMemoryContext;
sortKey->ssup_collation = node->collations[i];
sortKey->ssup_nulls_first = node->nullsFirst[i];
sortKey->ssup_attno = node->sortColIdx[i];
/*
* We don't perform abbreviated key conversion here, for the same
* reasons that it isn't used in MergeAppend
*/
sortKey->abbreviate = false;
PrepareSortSupportFromOrderingOp(node->sortOperators[i], sortKey);
}
}
/*
* store the tuple descriptor into gather merge state, so we can use it
* later while initializing the gather merge slots.
*/
if (!ExecContextForcesOids(&gm_state->ps, &hasoid))
hasoid = false;
tupDesc = ExecTypeFromTL(outerNode->targetlist, hasoid);
gm_state->tupDesc = tupDesc;
return gm_state;
}