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Guard against stopping when numberTuples=0 and counter wraps around.

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This commit is contained in:
Tom Lane 2003-01-08 23:32:29 +00:00
parent b56af49849
commit 3bb248ac23
1 changed files with 5 additions and 4 deletions
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9
src/backend/executor/execMain.c
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@ -26,7 +26,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/executor/execMain.c,v 1.195 2002/12/18 00:14:47 tgl Exp $ * $Header: /cvsroot/pgsql/src/backend/executor/execMain.c,v 1.196 2003/01/08 23:32:29 tgl Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -166,7 +166,7 @@ ExecutorStart(QueryDesc *queryDesc)
* except to start up/shut down the destination. Otherwise, * except to start up/shut down the destination. Otherwise,
* we retrieve up to 'count' tuples in the specified direction. * we retrieve up to 'count' tuples in the specified direction.
* *
* Note: count = 0 is interpreted as no portal limit, e.g. run to * Note: count = 0 is interpreted as no portal limit, i.e., run to
* completion. * completion.
* *
* ---------------------------------------------------------------- * ----------------------------------------------------------------
@ -846,6 +846,7 @@ ExecEndPlan(PlanState *planstate, EState *estate)
* *
* processes the query plan to retrieve 'numberTuples' tuples in the * processes the query plan to retrieve 'numberTuples' tuples in the
* direction specified. * direction specified.
*
* Retrieves all tuples if numberTuples is 0 * Retrieves all tuples if numberTuples is 0
* *
* result is either a slot containing the last tuple in the case * result is either a slot containing the last tuple in the case
@ -1091,10 +1092,10 @@ lnext: ;
/* /*
* check our tuple count.. if we've processed the proper number * check our tuple count.. if we've processed the proper number
* then quit, else loop again and process more tuples. Zero * then quit, else loop again and process more tuples. Zero
* number_tuples means no limit. * numberTuples means no limit.
*/ */
current_tuple_count++; current_tuple_count++;
if (numberTuples == current_tuple_count) if (numberTuples && numberTuples == current_tuple_count)
break; break;
} }