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Since COPY fires triggers, it seems like a good idea for it to use

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a frozen (copied) snapshot too.  Move execMain's snapshot copying code
out into a subroutine in case we find other places that need it.
This commit is contained in:
Tom Lane
2002-05-21 22:59:01 +00:00
parent 26fcd25c57
commit 6c6f395a8a
4 changed files with 44 additions and 22 deletions
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20
src/backend/executor/execMain.c
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@ -27,7 +27,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/executor/execMain.c,v 1.162 2002/05/21 22:05:55 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/executor/execMain.c,v 1.163 2002/05/21 22:59:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -101,7 +101,6 @@ TupleDesc
ExecutorStart(QueryDesc *queryDesc, EState *estate)
{
TupleDesc result;
Snapshot es_snapshot;
/* sanity checks */
Assert(queryDesc != NULL);
@ -121,22 +120,7 @@ ExecutorStart(QueryDesc *queryDesc, EState *estate)
* for the life of this query, even if it outlives the current command
* and current snapshot.
*/
if (QuerySnapshot == NULL) /* should be set already, but... */
SetQuerySnapshot();
es_snapshot = (Snapshot) palloc(sizeof(SnapshotData));
memcpy(es_snapshot, QuerySnapshot, sizeof(SnapshotData));
if (es_snapshot->xcnt > 0)
{
es_snapshot->xip = (TransactionId *)
palloc(es_snapshot->xcnt * sizeof(TransactionId));
memcpy(es_snapshot->xip, QuerySnapshot->xip,
es_snapshot->xcnt * sizeof(TransactionId));
}
else
es_snapshot->xip = NULL;
estate->es_snapshot = es_snapshot;
estate->es_snapshot = CopyQuerySnapshot();
/*
* Initialize the plan