Fix division by zero in the new range type histogram creation.

Report and analysis by Matthias.

Fix division by zero in the new range type histogram creation.
Report and analysis by Matthias.
3e6eb0dd · Heikki Linnakangas · a66fca3f · 3e6eb0dd
Commit 3e6eb0dd authored Aug 30, 2012 by Heikki Linnakangas
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src/backend/utils/adt/rangetypes_typanalyze.c src/backend/utils/adt/rangetypes_typanalyze.c +4 -1

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--- a/src/backend/utils/adt/rangetypes_typanalyze.c
+++ b/src/backend/utils/adt/rangetypes_typanalyze.c
@@ -158,7 +158,10 @@ compute_range_stats(VacAttrStats *stats, AnalyzeAttrFetchFunc fetchfunc,
 		/* Must copy the target values into anl_context */
 		old_cxt = MemoryContextSwitchTo(stats->anl_context);

-		if (non_empty_cnt > 0)
+		/*
+		 * Generate a histogram slot entry if there are at least two values.
+		 */
+		if (non_empty_cnt >= 2)
 		{
 			/* Sort bound values */
 			qsort_arg(lowers, non_empty_cnt, sizeof(RangeBound),