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Implement SQL92-compatible FIRST, LAST, ABSOLUTE n, RELATIVE n options

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for FETCH and MOVE.
This commit is contained in:
Tom Lane
2003-03-11 19:40:24 +00:00
parent e4704001ea
commit 6261c75014
13 changed files with 669 additions and 387 deletions
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38
src/backend/executor/execMain.c
View File

@ -26,7 +26,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/executor/execMain.c,v 1.201 2003/03/10 03:53:49 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/executor/execMain.c,v 1.202 2003/03/11 19:40:22 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -287,6 +287,42 @@ ExecutorEnd(QueryDesc *queryDesc)
queryDesc->planstate = NULL;
}
/* ----------------------------------------------------------------
* ExecutorRewind
*
* This routine may be called on an open queryDesc to rewind it
* to the start.
* ----------------------------------------------------------------
*/
void
ExecutorRewind(QueryDesc *queryDesc)
{
EState *estate;
MemoryContext oldcontext;
/* sanity checks */
Assert(queryDesc != NULL);
estate = queryDesc->estate;
Assert(estate != NULL);
/* It's probably not sensible to rescan updating queries */
Assert(queryDesc->operation == CMD_SELECT);
/*
* Switch into per-query memory context
*/
oldcontext = MemoryContextSwitchTo(estate->es_query_cxt);
/*
* rescan plan
*/
ExecReScan(queryDesc->planstate, NULL);
MemoryContextSwitchTo(oldcontext);
}
/*
* ExecCheckRTPerms

9
src/backend/executor/spi.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/executor/spi.c,v 1.87 2003/03/10 03:53:49 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/executor/spi.c,v 1.88 2003/03/11 19:40:22 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1349,8 +1349,11 @@ _SPI_cursor_operation(Portal portal, bool forward, int count,
_SPI_current->tuptable = NULL;
/* Run the cursor */
_SPI_current->processed = DoPortalFetch(portal, forward, (long) count,
dest);
_SPI_current->processed =
DoPortalFetch(portal,
forward ? FETCH_FORWARD : FETCH_BACKWARD,
(long) count,
dest);
if (dest == SPI && _SPI_checktuples())
elog(FATAL, "SPI_fetch: # of processed tuples check failed");