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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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44
src/backend/executor/nodeIndexscan.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/executor/nodeIndexscan.c,v 1.29 1998/11/27 19:52:03 vadim Exp $
* $Header: /cvsroot/pgsql/src/backend/executor/nodeIndexscan.c,v 1.30 1999/01/29 09:22:58 vadim Exp $
*
*-------------------------------------------------------------------------
*/
@ -109,6 +109,40 @@ IndexNext(IndexScan *node)
heapRelation = scanstate->css_currentRelation;
numIndices = indexstate->iss_NumIndices;
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
* IndexScan --> NewNode switching in Init/ReScan plan...
*/
if (estate->es_evTuple != NULL &&
estate->es_evTuple[node->scan.scanrelid - 1] != NULL)
{
int iptr;
slot->ttc_buffer = InvalidBuffer;
slot->ttc_shouldFree = false;
if (estate->es_evTupleNull[node->scan.scanrelid - 1])
{
slot->val = NULL; /* must not free tuple! */
return (slot);
}
slot->val = estate->es_evTuple[node->scan.scanrelid - 1];
for (iptr = 0; iptr < numIndices; iptr++)
{
scanstate->cstate.cs_ExprContext->ecxt_scantuple = slot;
if (ExecQual(nth(iptr, node->indxqualorig),
scanstate->cstate.cs_ExprContext))
break;
}
if (iptr == numIndices) /* would not be returned by indices */
slot->val = NULL;
/* Flag for the next call that no more tuples */
estate->es_evTupleNull[node->scan.scanrelid - 1] = true;
return (slot);
}
tuple = &(indexstate->iss_htup);
/* ----------------
@ -262,6 +296,14 @@ ExecIndexReScan(IndexScan *node, ExprContext *exprCtxt, Plan *parent)
numScanKeys = indexstate->iss_NumScanKeys;
indexstate->iss_IndexPtr = 0;
/* If this is re-scanning of PlanQual ... */
if (estate->es_evTuple != NULL &&
estate->es_evTuple[node->scan.scanrelid - 1] != NULL)
{
estate->es_evTupleNull[node->scan.scanrelid - 1] = false;
return;
}
/* it's possible in subselects */
if (exprCtxt == NULL)
exprCtxt = node->scan.scanstate->cstate.cs_ExprContext;