Avoid possible divide-by-zero in gincostestimate.

Per report from Jeff Janes.

Avoid possible divide-by-zero in gincostestimate.
Per report from Jeff Janes.
92647fc4 · Tom Lane · a0e8df52 · 92647fc4
Commit 92647fc4 authored Apr 21, 2011 by Tom Lane
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src/backend/utils/adt/selfuncs.c src/backend/utils/adt/selfuncs.c +4 -0

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--- a/src/backend/utils/adt/selfuncs.c
+++ b/src/backend/utils/adt/selfuncs.c
@@ -6458,6 +6458,10 @@ gincostestimate(PG_FUNCTION_ARGS)
 		numDataPages = Min(numDataPages, numPages - numEntryPages);
 	}

+	/* In an empty index, numEntries could be zero.  Avoid divide-by-zero */
+	if (numEntries < 1)
+		numEntries = 1;
+
 	/*
 	 * Include predicate in selectivityQuals (should match
 	 * genericcostestimate)