/* ----------------------------------------------------------------
* ExecEndSort(node)
* ----------------------------------------------------------------
*/
void
ExecEndSort(SortState *node)
{
SO1_printf("ExecEndSort: %s\n",
"shutting down sort node");
/*
* clean out the tuple table
*/
ExecClearTuple(node->ss.ss_ScanTupleSlot);
/* must drop pointer to sort result tuple */
ExecClearTuple(node->ss.ps.ps_ResultTupleSlot);
/*
* Release tuplesort resources
*/
if (node->tuplesortstate != NULL)
tuplesort_end((Tuplesortstate *) node->tuplesortstate);
node->tuplesortstate = NULL;
/*
* shut down the subplan
*/
ExecEndNode(outerPlanState(node));
SO1_printf("ExecEndSort: %s\n",
"sort node shutdown");
}
/* ----------------------------------------------------------------
* ExecInitHash
*
* Init routine for Hash node
* ----------------------------------------------------------------
*/
bool
ExecInitHash(Hash *node, EState *estate, Plan *parent)
{
HashState *hashstate;
Plan *outerPlan;
SO1_printf("ExecInitHash: %s\n",
"initializing hash node");
/* ----------------
* assign the node's execution state
* ----------------
*/
node->plan.state = estate;
/* ----------------
* create state structure
* ----------------
*/
hashstate = makeNode(HashState);
node->hashstate = hashstate;
hashstate->hashBatches = NULL;
/* ----------------
* Miscellanious initialization
*
* + assign node's base_id
* + assign debugging hooks and
* + create expression context for node
* ----------------
*/
ExecAssignNodeBaseInfo(estate, &hashstate->cstate, parent);
ExecAssignExprContext(estate, &hashstate->cstate);
#define HASH_NSLOTS 1
/* ----------------
* initialize our result slot
* ----------------
*/
ExecInitResultTupleSlot(estate, &hashstate->cstate);
/* ----------------
* initializes child nodes
* ----------------
*/
outerPlan = outerPlan(node);
ExecInitNode(outerPlan, estate, (Plan *)node);
/* ----------------
* initialize tuple type. no need to initialize projection
* info because this node doesn't do projections
* ----------------
*/
ExecAssignResultTypeFromOuterPlan((Plan *) node, &hashstate->cstate);
hashstate->cstate.cs_ProjInfo = NULL;
return TRUE;
}
/* ----------------------------------------------------------------
* ExecEndSort(node)
* ----------------------------------------------------------------
*/
void
ExecEndSort(SortState *node)
{
SO1_printf("ExecEndSort: %s\n",
"shutting down sort node");
ExecEagerFreeSort(node);
/*
* shut down the subplan
*/
ExecEndNode(outerPlanState(node));
SO1_printf("ExecEndSort: %s\n",
"sort node shutdown");
EndPlanStateGpmonPkt(&node->ss.ps);
}
/* ----------------------------------------------------------------
* ExecSort
*
* Sorts tuples from the outer subtree of the node using tuplesort,
* which saves the results in a temporary file or memory. After the
* initial call, returns a tuple from the file with each call.
*
* Conditions:
* -- none.
*
* Initial States:
* -- the outer child is prepared to return the first tuple.
* ----------------------------------------------------------------
*/
TupleTableSlot *
ExecSort(SortState *node)
{
EState *estate;
ScanDirection dir;
Tuplesortstate *tuplesortstate;
TupleTableSlot *slot;
/*
* get state info from node
*/
SO1_printf("ExecSort: %s\n",
"entering routine");
estate = node->ss.ps.state;
dir = estate->es_direction;
tuplesortstate = (Tuplesortstate *) node->tuplesortstate;
/*
* If first time through, read all tuples from outer plan and pass them to
* tuplesort.c. Subsequent calls just fetch tuples from tuplesort.
*/
if (!node->sort_Done)
{
Sort *plannode = (Sort *) node->ss.ps.plan;
PlanState *outerNode;
TupleDesc tupDesc;
SO1_printf("ExecSort: %s\n",
"sorting subplan");
/*
* Want to scan subplan in the forward direction while creating the
* sorted data.
*/
estate->es_direction = ForwardScanDirection;
/*
* Initialize tuplesort module.
*/
SO1_printf("ExecSort: %s\n",
"calling tuplesort_begin");
outerNode = outerPlanState(node);
tupDesc = ExecGetResultType(outerNode);
tuplesortstate = tuplesort_begin_heap(tupDesc,
plannode->numCols,
plannode->sortColIdx,
plannode->sortOperators,
plannode->collations,
plannode->nullsFirst,
work_mem,
node->randomAccess);
if (node->bounded)
tuplesort_set_bound(tuplesortstate, node->bound);
node->tuplesortstate = (void *) tuplesortstate;
/*
* Scan the subplan and feed all the tuples to tuplesort.
*/
for (;;)
{
slot = ExecProcNode(outerNode);
if (TupIsNull(slot))
break;
tuplesort_puttupleslot(tuplesortstate, slot);
}
/*
* Complete the sort.
*/
tuplesort_performsort(tuplesortstate);
/*
* restore to user specified direction
*/
estate->es_direction = dir;
/*
* finally set the sorted flag to true
*/
node->sort_Done = true;
node->bounded_Done = node->bounded;
node->bound_Done = node->bound;
SO1_printf("ExecSort: %s\n", "sorting done");
}
SO1_printf("ExecSort: %s\n",
"retrieving tuple from tuplesort");
/*
* Get the first or next tuple from tuplesort. Returns NULL if no more
* tuples.
*/
slot = node->ss.ps.ps_ResultTupleSlot;
(void) tuplesort_gettupleslot(tuplesortstate,
ScanDirectionIsForward(dir),
slot);
return slot;
}
/* ----------------------------------------------------------------
* ExecInitSort
*
* Creates the run-time state information for the sort node
* produced by the planner and initializes its outer subtree.
* ----------------------------------------------------------------
*/
SortState *
ExecInitSort(Sort *node, EState *estate, int eflags)
{
SortState *sortstate;
SO1_printf("ExecInitSort: %s\n",
"initializing sort node");
/*
* create state structure
*/
sortstate = makeNode(SortState);
sortstate->ss.ps.plan = (Plan *) node;
sortstate->ss.ps.state = estate;
/*
* We must have random access to the sort output to do backward scan or
* mark/restore. We also prefer to materialize the sort output if we
* might be called on to rewind and replay it many times.
*/
sortstate->randomAccess = (eflags & (EXEC_FLAG_REWIND |
EXEC_FLAG_BACKWARD |
EXEC_FLAG_MARK)) != 0;
sortstate->bounded = false;
sortstate->sort_Done = false;
sortstate->tuplesortstate = NULL;
/*
* Miscellaneous initialization
*
* Sort nodes don't initialize their ExprContexts because they never call
* ExecQual or ExecProject.
*/
/*
* tuple table initialization
*
* sort nodes only return scan tuples from their sorted relation.
*/
ExecInitResultTupleSlot(estate, &sortstate->ss.ps);
ExecInitScanTupleSlot(estate, &sortstate->ss);
/*
* initialize child nodes
*
* We shield the child node from the need to support REWIND, BACKWARD, or
* MARK/RESTORE.
*/
eflags &= ~(EXEC_FLAG_REWIND | EXEC_FLAG_BACKWARD | EXEC_FLAG_MARK);
outerPlanState(sortstate) = ExecInitNode(outerPlan(node), estate, eflags);
/*
* initialize tuple type. no need to initialize projection info because
* this node doesn't do projections.
*/
ExecAssignResultTypeFromTL(&sortstate->ss.ps);
ExecAssignScanTypeFromOuterPlan(&sortstate->ss);
sortstate->ss.ps.ps_ProjInfo = NULL;
SO1_printf("ExecInitSort: %s\n",
"sort node initialized");
return sortstate;
}
/* ----------------------------------------------------------------
* ExecSort
*
* Sorts tuples from the outer subtree of the node using tuplesort,
* which saves the results in a temporary file or memory. After the
* initial call, returns a tuple from the file with each call.
*
* Conditions:
* -- none.
*
* Initial States:
* -- the outer child is prepared to return the first tuple.
* ----------------------------------------------------------------
*/
TupleTableSlot *
ExecSort(SortState *node)
{
EState *estate;
ScanDirection dir;
Tuplesortstate *tuplesortstate;
TupleTableSlot *slot;
/*
* get state info from node
*/
SO1_printf("ExecSort: %s\n",
"entering routine");
estate = node->ss.ps.state;
dir = estate->es_direction;
tuplesortstate = (Tuplesortstate *) node->tuplesortstate;
/*
* If first time through, read all tuples from outer plan and pass them to
* tuplesort.c. Subsequent calls just fetch tuples from tuplesort.
*/
if (!node->sort_Done)
{
Sort *plannode = (Sort *) node->ss.ps.plan;
PlanState *outerNode;
TupleDesc tupDesc;
SO1_printf("ExecSort: %s\n",
"sorting subplan");
/*
* Want to scan subplan in the forward direction while creating the
* sorted data.
*/
estate->es_direction = ForwardScanDirection;
/*
* Initialize tuplesort module.
*/
SO1_printf("ExecSort: %s\n",
"calling tuplesort_begin");
outerNode = outerPlanState(node);
tupDesc = ExecGetResultType(outerNode);
#ifdef PGXC
if (plannode->srt_start_merge &&
IsA(node->ss.ps.lefttree, RemoteQueryState))
{
RemoteQueryState *rqs = (RemoteQueryState *)node->ss.ps.lefttree;
rqs->rqs_for_sort = true;
/*
* Start the queries on all the nodes. That way we get the number of
* connections and connection handlers set in RemoteQueryState.
* Those will be used to merge the data from the datanodes.
*/
if (!rqs->query_Done)
{
do_query(rqs);
rqs->query_Done = true;
}
/*
* PGXCTODO: We don't handle bounded in this case, but see if it can
* be used.
*/
tuplesortstate = tuplesort_begin_merge(tupDesc,
plannode->numCols,
plannode->sortColIdx,
plannode->sortOperators,
plannode->collations,
plannode->nullsFirst,
rqs, work_mem);
}
else
{
#endif /* PGXC */
tuplesortstate = tuplesort_begin_heap(tupDesc,
plannode->numCols,
plannode->sortColIdx,
plannode->sortOperators,
plannode->collations,
plannode->nullsFirst,
work_mem,
node->randomAccess);
if (node->bounded)
tuplesort_set_bound(tuplesortstate, node->bound);
#ifdef PGXC
}
#endif /* PGXC */
node->tuplesortstate = (void *) tuplesortstate;
#ifdef PGXC
if (!plannode->srt_start_merge)
{
#endif /* PGXC */
/*
* Scan the subplan and feed all the tuples to tuplesort.
*/
for (;;)
{
slot = ExecProcNode(outerNode);
if (TupIsNull(slot))
break;
tuplesort_puttupleslot(tuplesortstate, slot);
}
/*
* Complete the sort.
*/
tuplesort_performsort(tuplesortstate);
#ifdef PGXC
}
else
Assert(IsA(node->ss.ps.lefttree, RemoteQueryState));
#endif /* PGXC */
/*
* restore to user specified direction
*/
estate->es_direction = dir;
/*
* finally set the sorted flag to true
*/
node->sort_Done = true;
node->bounded_Done = node->bounded;
node->bound_Done = node->bound;
SO1_printf("ExecSort: %s\n", "sorting done");
}
SO1_printf("ExecSort: %s\n",
"retrieving tuple from tuplesort");
/*
* Get the first or next tuple from tuplesort. Returns NULL if no more
* tuples.
*/
slot = node->ss.ps.ps_ResultTupleSlot;
(void) tuplesort_gettupleslot(tuplesortstate,
ScanDirectionIsForward(dir),
slot);
return slot;
}
/* ----------------------------------------------------------------
* ExecSort
*
* Sorts tuples from the outer subtree of the node using tuplesort,
* which saves the results in a temporary file or memory. After the
* initial call, returns a tuple from the file with each call.
*
* Conditions:
* -- none.
*
* Initial States:
* -- the outer child is prepared to return the first tuple.
* ----------------------------------------------------------------
*/
static TupleTableSlot *
ExecSort(PlanState *pstate)
{
SortState *node = castNode(SortState, pstate);
EState *estate;
ScanDirection dir;
Tuplesortstate *tuplesortstate;
TupleTableSlot *slot;
CHECK_FOR_INTERRUPTS();
/*
* get state info from node
*/
SO1_printf("ExecSort: %s\n",
"entering routine");
estate = node->ss.ps.state;
dir = estate->es_direction;
tuplesortstate = (Tuplesortstate *) node->tuplesortstate;
/*
* If first time through, read all tuples from outer plan and pass them to
* tuplesort.c. Subsequent calls just fetch tuples from tuplesort.
*/
if (!node->sort_Done)
{
Sort *plannode = (Sort *) node->ss.ps.plan;
PlanState *outerNode;
TupleDesc tupDesc;
SO1_printf("ExecSort: %s\n",
"sorting subplan");
/*
* Want to scan subplan in the forward direction while creating the
* sorted data.
*/
estate->es_direction = ForwardScanDirection;
/*
* Initialize tuplesort module.
*/
SO1_printf("ExecSort: %s\n",
"calling tuplesort_begin");
outerNode = outerPlanState(node);
tupDesc = ExecGetResultType(outerNode);
tuplesortstate = tuplesort_begin_heap(tupDesc,
plannode->numCols,
plannode->sortColIdx,
plannode->sortOperators,
plannode->collations,
plannode->nullsFirst,
work_mem,
NULL, node->randomAccess);
if (node->bounded)
tuplesort_set_bound(tuplesortstate, node->bound);
node->tuplesortstate = (void *) tuplesortstate;
/*
* Scan the subplan and feed all the tuples to tuplesort.
*/
for (;;)
{
slot = ExecProcNode(outerNode);
if (TupIsNull(slot))
break;
tuplesort_puttupleslot(tuplesortstate, slot);
}
/*
* Complete the sort.
*/
tuplesort_performsort(tuplesortstate);
/*
* restore to user specified direction
*/
estate->es_direction = dir;
/*
* finally set the sorted flag to true
*/
node->sort_Done = true;
node->bounded_Done = node->bounded;
node->bound_Done = node->bound;
if (node->shared_info && node->am_worker)
{
TuplesortInstrumentation *si;
Assert(IsParallelWorker());
Assert(ParallelWorkerNumber <= node->shared_info->num_workers);
si = &node->shared_info->sinstrument[ParallelWorkerNumber];
tuplesort_get_stats(tuplesortstate, si);
}
SO1_printf("ExecSort: %s\n", "sorting done");
}
SO1_printf("ExecSort: %s\n",
"retrieving tuple from tuplesort");
/*
* Get the first or next tuple from tuplesort. Returns NULL if no more
* tuples. Note that we only rely on slot tuple remaining valid until the
* next fetch from the tuplesort.
*/
slot = node->ss.ps.ps_ResultTupleSlot;
(void) tuplesort_gettupleslot(tuplesortstate,
ScanDirectionIsForward(dir),
false, slot, NULL);
return slot;
}
/* ----------------------------------------------------------------
* ExecSort
*
* Sorts tuples from the outer subtree of the node using tuplesort,
* which saves the results in a temporary file or memory. After the
* initial call, returns a tuple from the file with each call.
*
* Conditions:
* -- none.
*
* Initial States:
* -- the outer child is prepared to return the first tuple.
* ----------------------------------------------------------------
*/
TupleTableSlot *
ExecSort(SortState *node)
{
EState *estate;
ScanDirection dir;
Tuplesortstate *tuplesortstate = NULL;
Tuplesortstate_mk *tuplesortstate_mk = NULL;
TupleTableSlot *slot = NULL;
Sort *plannode = NULL;
PlanState *outerNode = NULL;
TupleDesc tupDesc = NULL;
workfile_set *work_set = NULL;
/*
* get state info from node
*/
SO1_printf("ExecSort: %s\n",
"entering routine");
estate = node->ss.ps.state;
dir = estate->es_direction;
if(gp_enable_mk_sort)
{
tuplesortstate_mk = node->tuplesortstate->sortstore_mk;
}
else
{
tuplesortstate = node->tuplesortstate->sortstore;
}
/*
* In Window node, we might need to call ExecSort again even when
* the last tuple in the Sort has been retrieved. Since we might
* eager free the tuplestore, the tuplestorestate could be NULL.
* We simply return NULL in this case.
*/
if (node->sort_Done &&
((gp_enable_mk_sort && tuplesortstate_mk == NULL) ||
(!gp_enable_mk_sort && tuplesortstate == NULL)))
{
return NULL;
}
plannode = (Sort *) node->ss.ps.plan;
/*
* If called for the first time, initialize tuplesort_state
*/
if (!node->sort_Done)
{
SO1_printf("ExecSort: %s\n",
"sorting subplan");
if (gp_workfile_caching)
{
/* Look for cached workfile set. Mark here if found */
work_set = workfile_mgr_find_set(&node->ss.ps);
if (work_set != NULL)
{
elog(gp_workfile_caching_loglevel, "Sort found matching cached workfile set");
node->cached_workfiles_found = true;
}
}
/*
* Want to scan subplan in the forward direction while creating the
* sorted data.
*/
estate->es_direction = ForwardScanDirection;
/*
* Initialize tuplesort module.
*/
SO1_printf("ExecSort: %s\n",
"calling tuplesort_begin");
outerNode = outerPlanState(node);
tupDesc = ExecGetResultType(outerNode);
if(plannode->share_type == SHARE_SORT_XSLICE)
{
char rwfile_prefix[100];
if(plannode->driver_slice != currentSliceId)
{
elog(LOG, "Sort exec on CrossSlice, current slice %d", currentSliceId);
return NULL;
}
shareinput_create_bufname_prefix(rwfile_prefix, sizeof(rwfile_prefix), plannode->share_id);
elog(LOG, "Sort node create shareinput rwfile %s", rwfile_prefix);
if(gp_enable_mk_sort)
tuplesortstate_mk = tuplesort_begin_heap_file_readerwriter_mk(
& node->ss,
rwfile_prefix, true,
tupDesc,
plannode->numCols,
plannode->sortOperators,
plannode->sortColIdx,
PlanStateOperatorMemKB((PlanState *) node),
true
);
else
tuplesortstate = tuplesort_begin_heap_file_readerwriter(
rwfile_prefix, true,
tupDesc,
plannode->numCols,
plannode->sortOperators,
plannode->sortColIdx,
PlanStateOperatorMemKB((PlanState *) node),
true
);
}
else
{
if(gp_enable_mk_sort)
tuplesortstate_mk = tuplesort_begin_heap_mk(& node->ss,
tupDesc,
plannode->numCols,
plannode->sortOperators,
plannode->sortColIdx,
PlanStateOperatorMemKB((PlanState *) node),
node->randomAccess);
else
tuplesortstate = tuplesort_begin_heap(tupDesc,
plannode->numCols,
plannode->sortOperators,
plannode->sortColIdx,
PlanStateOperatorMemKB((PlanState *) node),
node->randomAccess);
}
if(gp_enable_mk_sort)
{
node->tuplesortstate->sortstore_mk = tuplesortstate_mk;
}
else
{
node->tuplesortstate->sortstore = tuplesortstate;
}
/* CDB */
{
ExprContext *econtext = node->ss.ps.ps_ExprContext;
bool isNull;
int64 limit = 0;
int64 offset = 0;
int unique = 0;
int sort_flags = gp_sort_flags; /* get the guc */
int maxdistinct = gp_sort_max_distinct; /* get the guc */
if (node->limitCount)
{
limit =
DatumGetInt64(
ExecEvalExprSwitchContext(node->limitCount,
econtext,
&isNull,
NULL));
/* Interpret NULL limit as no limit */
if (isNull)
limit = 0;
else if (limit < 0)
limit = 0;
}
if (node->limitOffset)
{
offset =
DatumGetInt64(
ExecEvalExprSwitchContext(node->limitOffset,
econtext,
&isNull,
NULL));
/* Interpret NULL offset as no offset */
if (isNull)
offset = 0;
else if (offset < 0)
offset = 0;
}
if (node->noduplicates)
unique = 1;
if(gp_enable_mk_sort)
cdb_tuplesort_init_mk(tuplesortstate_mk, offset, limit, unique, sort_flags, maxdistinct);
else
cdb_tuplesort_init(tuplesortstate, offset, limit, unique, sort_flags, maxdistinct);
}
/* If EXPLAIN ANALYZE, share our Instrumentation object with sort. */
if(gp_enable_mk_sort)
{
if (node->ss.ps.instrument)
tuplesort_set_instrument_mk(tuplesortstate_mk,
node->ss.ps.instrument,
node->ss.ps.cdbexplainbuf);
tuplesort_set_gpmon_mk(tuplesortstate_mk, &node->ss.ps.gpmon_pkt,
&node->ss.ps.gpmon_plan_tick);
}
else
{
if (node->ss.ps.instrument)
tuplesort_set_instrument(tuplesortstate,
node->ss.ps.instrument,
node->ss.ps.cdbexplainbuf);
tuplesort_set_gpmon(tuplesortstate, &node->ss.ps.gpmon_pkt,
&node->ss.ps.gpmon_plan_tick);
}
}
/*
* Before reading any tuples from below, check if we can re-use
* existing spill files.
* Only mk_sort supports spill file caching.
*/
if (!node->sort_Done && gp_enable_mk_sort && gp_workfile_caching)
{
Assert(tuplesortstate_mk != NULL);
if (node->cached_workfiles_found && !node->cached_workfiles_loaded)
{
Assert(work_set != NULL);
elog(gp_workfile_caching_loglevel, "nodeSort: loading cached workfile metadata");
tuplesort_set_spillfile_set_mk(tuplesortstate_mk, work_set);
tuplesort_read_spill_metadata_mk(tuplesortstate_mk);
node->cached_workfiles_loaded = true;
if (node->ss.ps.instrument)
{
node->ss.ps.instrument->workfileReused = true;
}
/* Loaded sorted data from cached workfile, therefore
* no need to sort anymore!
*/
node->sort_Done = true;
elog(gp_workfile_caching_loglevel, "Sort reusing cached workfiles, initiating Squelch walker");
ExecSquelchNode(outerNode);
}
}
/*
* If first time through and no cached workfiles can be used,
* read all tuples from outer plan and pass them to
* tuplesort.c. Subsequent calls just fetch tuples from tuplesort.
*/
if (!node->sort_Done)
{
Assert(outerNode != NULL);
/*
* Scan the subplan and feed all the tuples to tuplesort.
*/
for (;;)
{
slot = ExecProcNode(outerNode);
if (TupIsNull(slot))
{
break;
}
CheckSendPlanStateGpmonPkt(&node->ss.ps);
if(gp_enable_mk_sort)
tuplesort_puttupleslot_mk(tuplesortstate_mk, slot);
else
tuplesort_puttupleslot(tuplesortstate, slot);
}
#ifdef FAULT_INJECTOR
FaultInjector_InjectFaultIfSet(
ExecSortBeforeSorting,
DDLNotSpecified,
"" /* databaseName */,
"" /* tableName */
);
#endif
/*
* Complete the sort.
*/
if(gp_enable_mk_sort)
{
tuplesort_performsort_mk(tuplesortstate_mk);
}
else
{
tuplesort_performsort(tuplesortstate);
}
CheckSendPlanStateGpmonPkt(&node->ss.ps);
/*
* restore to user specified direction
*/
estate->es_direction = dir;
/*
* finally set the sorted flag to true
*/
node->sort_Done = true;
SO1_printf("ExecSort: %s\n", "sorting done");
/* for share input, do not need to return any tuple */
if(plannode->share_type != SHARE_NOTSHARED)
{
Assert(plannode->share_type == SHARE_SORT || plannode->share_type == SHARE_SORT_XSLICE);
if(plannode->share_type == SHARE_SORT_XSLICE)
{
if(plannode->driver_slice == currentSliceId)
{
if(gp_enable_mk_sort)
tuplesort_flush_mk(tuplesortstate_mk);
else
tuplesort_flush(tuplesortstate);
node->share_lk_ctxt = shareinput_writer_notifyready(plannode->share_id, plannode->nsharer_xslice,
estate->es_plannedstmt->planGen);
}
}
return NULL;
}
} /* if (!node->sort_Done) */
if(plannode->share_type != SHARE_NOTSHARED)
return NULL;
SO1_printf("ExecSort: %s\n",
"retrieving tuple from tuplesort");
/*
* Get the first or next tuple from tuplesort. Returns NULL if no more
* tuples.
*/
slot = node->ss.ps.ps_ResultTupleSlot;
if(gp_enable_mk_sort)
(void) tuplesort_gettupleslot_mk(tuplesortstate_mk,
ScanDirectionIsForward(dir),
slot);
else
(void) tuplesort_gettupleslot(tuplesortstate,
ScanDirectionIsForward(dir),
slot);
if (TupIsNull(slot) && !node->ss.ps.delayEagerFree)
{
ExecEagerFreeSort(node);
}
return slot;
}
/* ----------------------------------------------------------------
* ExecInitSort
*
* Creates the run-time state information for the sort node
* produced by the planner and initializes its outer subtree.
* ----------------------------------------------------------------
*/
SortState *
ExecInitSort(Sort *node, EState *estate, int eflags)
{
SortState *sortstate;
SO1_printf("ExecInitSort: %s\n",
"initializing sort node");
/*
* create state structure
*/
sortstate = makeNode(SortState);
sortstate->ss.ps.plan = (Plan *) node;
sortstate->ss.ps.state = estate;
/*
* We must have random access to the sort output to do backward scan or
* mark/restore. We also prefer to materialize the sort output if we
* might be called on to rewind and replay it many times.
*/
sortstate->randomAccess = (eflags & (EXEC_FLAG_REWIND |
EXEC_FLAG_BACKWARD |
EXEC_FLAG_MARK)) != 0;
/* If the sort is shared, we need random access */
if(node->share_type != SHARE_NOTSHARED)
sortstate->randomAccess = true;
sortstate->sort_Done = false;
sortstate->tuplesortstate = palloc0(sizeof(GenericTupStore));
sortstate->share_lk_ctxt = NULL;
ExecSortResetWorkfileState(sortstate);
/* CDB */
/* BUT:
* The LIMIT optimizations requires exprcontext in which to
* evaluate the limit/offset parameters.
*/
ExecAssignExprContext(estate, &sortstate->ss.ps);
/* CDB */ /* evaluate a limit as part of the sort */
{
/* pass node state to sort state */
sortstate->limitOffset = ExecInitExpr((Expr *) node->limitOffset,
(PlanState *) sortstate);
sortstate->limitCount = ExecInitExpr((Expr *) node->limitCount,
(PlanState *) sortstate);
sortstate->noduplicates = node->noduplicates;
}
/*
* Miscellaneous initialization
*
* Sort nodes don't initialize their ExprContexts because they never call
* ExecQual or ExecProject.
*/
#define SORT_NSLOTS 2
/*
* tuple table initialization
*
* sort nodes only return scan tuples from their sorted relation.
*/
ExecInitResultTupleSlot(estate, &sortstate->ss.ps);
sortstate->ss.ss_ScanTupleSlot = ExecInitExtraTupleSlot(estate);
/*
* CDB: Offer extra info for EXPLAIN ANALYZE.
*/
if (estate->es_instrument)
{
/* Allocate string buffer. */
sortstate->ss.ps.cdbexplainbuf = makeStringInfo();
/* Request a callback at end of query. */
sortstate->ss.ps.cdbexplainfun = ExecSortExplainEnd;
}
/*
* If eflag contains EXEC_FLAG_REWIND or EXEC_FLAG_BACKWARD or EXEC_FLAG_MARK,
* then this node is not eager free safe.
*/
sortstate->ss.ps.delayEagerFree =
((eflags & (EXEC_FLAG_REWIND | EXEC_FLAG_BACKWARD | EXEC_FLAG_MARK)) != 0);
/*
* initialize child nodes
*
* We shield the child node from the need to support BACKWARD, or
* MARK/RESTORE.
*/
eflags &= ~(EXEC_FLAG_BACKWARD | EXEC_FLAG_MARK);
/*
* If Sort does not have any external parameters, then it
* can shield the child node from being rescanned as well, hence
* we can clear the EXEC_FLAG_REWIND as well. If there are parameters,
* don't clear the REWIND flag, as the child will be rewound.
*/
if (node->plan.allParam == NULL || node->plan.extParam == NULL)
{
eflags &= ~EXEC_FLAG_REWIND;
}
outerPlanState(sortstate) = ExecInitNode(outerPlan(node), estate, eflags);
/*
* If the child node of a Material is a Motion, then this Material node is
* not eager free safe.
*/
if (IsA(outerPlan((Plan *)node), Motion))
{
sortstate->ss.ps.delayEagerFree = true;
}
/*
* initialize tuple type. no need to initialize projection info because
* this node doesn't do projections.
*/
ExecAssignResultTypeFromTL(&sortstate->ss.ps);
ExecAssignScanTypeFromOuterPlan(&sortstate->ss);
sortstate->ss.ps.ps_ProjInfo = NULL;
if(node->share_type != SHARE_NOTSHARED)
{
ShareNodeEntry *snEntry = ExecGetShareNodeEntry(estate, node->share_id, true);
snEntry->sharePlan = (Node *)node;
snEntry->shareState = (Node *)sortstate;
}
SO1_printf("ExecInitSort: %s\n",
"sort node initialized");
initGpmonPktForSort((Plan *)node, &sortstate->ss.ps.gpmon_pkt, estate);
return sortstate;
}
