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READ COMMITTED isolevel is implemented and is default now.

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This commit is contained in:
Vadim B. Mikheev
1999-01-29 09:23:17 +00:00
parent 3e2f87f3f3
commit e3a1ab764e
12 changed files with 499 additions and 128 deletions
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41
src/backend/executor/nodeSeqscan.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/executor/nodeSeqscan.c,v 1.15 1998/09/25 13:38:32 thomas Exp $
* $Header: /cvsroot/pgsql/src/backend/executor/nodeSeqscan.c,v 1.16 1999/01/29 09:22:58 vadim Exp $
*
*-------------------------------------------------------------------------
*/
@ -64,6 +64,34 @@ SeqNext(SeqScan *node)
scanstate = node->scanstate;
scandesc = scanstate->css_currentScanDesc;
direction = estate->es_direction;
slot = scanstate->css_ScanTupleSlot;
/*
* Check if we are evaluating PlanQual for tuple of this relation.
* Additional checking is not good, but no other way for now.
* We could introduce new nodes for this case and handle
* SeqScan --> NewNode switching in Init/ReScan plan...
*/
if (estate->es_evTuple != NULL &&
estate->es_evTuple[node->scanrelid - 1] != NULL)
{
slot->ttc_buffer = InvalidBuffer;
slot->ttc_shouldFree = false;
if (estate->es_evTupleNull[node->scanrelid - 1])
{
slot->val = NULL; /* must not free tuple! */
return (slot);
}
slot->val = estate->es_evTuple[node->scanrelid - 1];
/*
* Note that unlike IndexScan, SeqScan never use keys
* in heap_beginscan (and this is very bad) - so, here
* we have not check are keys ok or not.
*/
/* Flag for the next call that no more tuples */
estate->es_evTupleNull[node->scanrelid - 1] = true;
return (slot);
}
/* ----------------
* get the next tuple from the access methods
@ -79,7 +107,6 @@ SeqNext(SeqScan *node)
* be pfree()'d.
* ----------------
*/
slot = scanstate->css_ScanTupleSlot;
slot = ExecStoreTuple(tuple,/* tuple to store */
slot, /* slot to store in */
@ -374,9 +401,15 @@ ExecSeqReScan(SeqScan *node, ExprContext *exprCtxt, Plan *parent)
outerPlan = outerPlan((Plan *) node);
ExecReScan(outerPlan, exprCtxt, parent);
}
else
else /* otherwise, we are scanning a relation */
{
/* otherwise, we are scanning a relation */
/* If this is re-scanning of PlanQual ... */
if (estate->es_evTuple != NULL &&
estate->es_evTuple[node->scanrelid - 1] != NULL)
{
estate->es_evTupleNull[node->scanrelid - 1] = false;
return;
}
rel = scanstate->css_currentRelation;
scan = scanstate->css_currentScanDesc;
direction = estate->es_direction;