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Defend against brain-dead QNX implementation of qsort().

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Per report from Bernd Tegge, 10-Nov-01.
This commit is contained in:
Tom Lane 2001-11-11 22:00:25 +00:00
parent c5c97318f9
commit 69a59150c2
1 changed files with 7 additions and 2 deletions
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9
src/backend/utils/sort/tuplesort.c
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@ -78,7 +78,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/sort/tuplesort.c,v 1.20 2001/10/28 06:25:57 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/sort/tuplesort.c,v 1.21 2001/11/11 22:00:25 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1881,8 +1881,13 @@ comparetup_index(Tuplesortstate *state, const void *a, const void *b)
* equal they *must* get compared at some stage of the sort ---
* otherwise the sort algorithm wouldn't have checked whether one must
* appear before the other.
*
* Some rather brain-dead implementations of qsort will sometimes
* call the comparison routine to compare a value to itself. (At this
* writing only QNX 4 is known to do such silly things.) Don't raise
* a bogus error in that case.
*/
if (state->enforceUnique && !equal_hasnull)
if (state->enforceUnique && !equal_hasnull && tuple1 != tuple2)
elog(ERROR, "Cannot create unique index. Table contains non-unique values");
return 0;