/* ----------------------------------------------------------------
* 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;
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;
}
/* ----------------------------------------------------------------
* 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;
}
