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Parallel query, sequence scan.

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This commit is contained in:
TotaJ
2020-09-16 20:10:45 +08:00
parent 2fe5d2dc09
commit 5dfa9d8ed1
109 changed files with 6485 additions and 185 deletions
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14
src/gausskernel/runtime/executor/nodeSamplescan.cpp
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@ -90,6 +90,16 @@ AbsTblScanDesc InitSampleScanDesc(ScanState* scanstate, Relation currentRelation
static inline HeapTuple SampleFetchNextTuple(SeqScanState* node)
{
HeapScanDesc heapScanDesc = GetHeapScanDesc(node->ss_currentScanDesc);
if (heapScanDesc == NULL) {
/*
* We reach here if the scan is not parallel, or if we're executing
* a scan that was intended to be parallel serially.
* It must be a non-partitioned table.
*/
Assert(!node->isPartTbl);
heapScanDesc = (HeapScanDesc)InitSampleScanDesc(node, node->ss_currentRelation);
node->ss_currentScanDesc = (AbsTblScanDesc)heapScanDesc;
}
heapScanDesc->rs_ss_accessor = node->ss_scanaccessor;
/*
@ -419,7 +429,7 @@ void RowTableSample::getMaxOffset()
{
HeapScanDesc heapscan = NULL;
AbsTblScanDesc scan = sampleScanState->ss_currentScanDesc;
bool pagemode = GetHeapScanDesc(scan)->rs_pageatatime;
bool pagemode = (GetHeapScanDesc(scan)->rs_flags) & SO_ALLOW_PAGEMODE;
Page page;
Assert(BlockNumberIsValid(currentBlock));
@ -456,7 +466,7 @@ void RowTableSample::getMaxOffset()
ScanValid RowTableSample::scanTup()
{
HeapScanDesc scan = GetHeapScanDesc(sampleScanState->ss_currentScanDesc);
bool pagemode = scan->rs_pageatatime;
bool pagemode = scan->rs_flags & SO_ALLOW_PAGEMODE;
HeapTuple tuple = &(scan->rs_ctup);
Snapshot snapshot = scan->rs_snapshot;
ItemId itemid;