/* ----------------------------------------------------------------
* 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;
}
/*
* init_tuplestore_state
* Initialize the tuplestore state for the Shared node if the state
* is not initialized.
*/
static void
init_tuplestore_state(ShareInputScanState *node)
{
Assert(node->ts_state == NULL);
EState *estate = node->ss.ps.state;
ShareInputScan *sisc = (ShareInputScan *)node->ss.ps.plan;
ShareNodeEntry *snEntry = ExecGetShareNodeEntry(estate, sisc->share_id, false);
PlanState *snState = NULL;
ShareType share_type = sisc->share_type;
if(snEntry)
{
snState = (PlanState *) snEntry->shareState;
if(snState)
{
ExecProcNode(snState);
}
else
{
Assert(share_type == SHARE_MATERIAL_XSLICE || share_type == SHARE_SORT_XSLICE);
}
}
if(share_type == SHARE_MATERIAL_XSLICE)
{
char rwfile_prefix[100];
shareinput_create_bufname_prefix(rwfile_prefix, sizeof(rwfile_prefix), sisc->share_id);
node->ts_state = palloc0(sizeof(GenericTupStore));
node->ts_state->matstore = ntuplestore_create_readerwriter(rwfile_prefix, 0, false);
node->ts_pos = (void *) ntuplestore_create_accessor(node->ts_state->matstore, false);
ntuplestore_acc_seek_bof((NTupleStoreAccessor *)node->ts_pos);
}
else if(share_type == SHARE_MATERIAL)
{
/* The materialstate->ts_state structure should have been initialized already, during init of material node */
node->ts_state = ((MaterialState *)snState)->ts_state;
Assert(NULL != node->ts_state->matstore);
node->ts_pos = (void *) ntuplestore_create_accessor(node->ts_state->matstore, false);
ntuplestore_acc_seek_bof((NTupleStoreAccessor *)node->ts_pos);
}
else if(share_type == SHARE_SORT_XSLICE)
{
char rwfile_prefix[100];
shareinput_create_bufname_prefix(rwfile_prefix, sizeof(rwfile_prefix), sisc->share_id);
node->ts_state = palloc0(sizeof(GenericTupStore));
if(gp_enable_mk_sort)
{
node->ts_state->sortstore_mk = tuplesort_begin_heap_file_readerwriter_mk(
& node->ss,
rwfile_prefix, false,
NULL, 0, NULL, NULL, PlanStateOperatorMemKB((PlanState *) node), true);
tuplesort_begin_pos_mk(node->ts_state->sortstore_mk, (TuplesortPos_mk **)(&node->ts_pos));
tuplesort_rescan_pos_mk(node->ts_state->sortstore_mk, (TuplesortPos_mk *)node->ts_pos);
}
else
{
node->ts_state->sortstore = tuplesort_begin_heap_file_readerwriter(
rwfile_prefix, false,
NULL, 0, NULL, NULL, PlanStateOperatorMemKB((PlanState *) node), true);
tuplesort_begin_pos(node->ts_state->sortstore, (TuplesortPos **)(&node->ts_pos));
tuplesort_rescan_pos(node->ts_state->sortstore, (TuplesortPos *)node->ts_pos);
}
}
else
{
Assert(sisc->share_type == SHARE_SORT);
Assert(snState != NULL);
if(gp_enable_mk_sort)
{
node->ts_state = ((SortState *)snState)->tuplesortstate;
Assert(NULL != node->ts_state->sortstore_mk);
tuplesort_begin_pos_mk(node->ts_state->sortstore_mk, (TuplesortPos_mk **)(&node->ts_pos));
tuplesort_rescan_pos_mk(node->ts_state->sortstore_mk, (TuplesortPos_mk *)node->ts_pos);
}
else
{
node->ts_state = ((SortState *)snState)->tuplesortstate;
Assert(NULL != node->ts_state->sortstore);
tuplesort_begin_pos(node->ts_state->sortstore, (TuplesortPos **)(&node->ts_pos));
tuplesort_rescan_pos(node->ts_state->sortstore, (TuplesortPos *)node->ts_pos);
}
}
Assert(NULL != node->ts_state);
Assert(NULL != node->ts_state->matstore || NULL != node->ts_state->sortstore || NULL != node->ts_state->sortstore_mk);
}
