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Fix stddev_pop(numeric) and var_pop(numeric), which were incorrectly producing

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the same outputs as stddev_samp() and var_samp() respectively.
This commit is contained in:
Tom Lane
2007-07-09 16:14:06 +00:00
parent 809b38ce27
commit 3df98a9e2f
2 changed files with 7 additions and 4 deletions
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7
src/backend/utils/adt/numeric.c
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@ -14,7 +14,7 @@
* Copyright (c) 1998-2006, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/numeric.c,v 1.96.2.1 2007/06/09 15:52:38 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/numeric.c,v 1.96.2.2 2007/07/09 16:14:05 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -2274,7 +2274,10 @@ numeric_stddev_internal(ArrayType *transarray,
}
else
{
mul_var(&vN, &vNminus1, &vNminus1, 0); /* N * (N - 1) */
if (sample)
mul_var(&vN, &vNminus1, &vNminus1, 0); /* N * (N - 1) */
else
mul_var(&vN, &vN, &vNminus1, 0); /* N * N */
rscale = select_div_scale(&vsumX2, &vNminus1);
div_var(&vsumX2, &vNminus1, &vsumX, rscale, true); /* variance */
if (!variance)