aphadke c671ee1ece IMPALA-4738: STDDEV_SAMP should return NULL for single record input ...

In calculating the STDDEV_SAMP/VARIANCE of N rows a divion by
N-1 rows is involved. Hence STDDEV_SAMP/VARIANCE for a single
row involves a division by 0. This change returns a NULL instead
of a 0 when calculating STDDEV_SAMP/VARIANCE for a single row.
STDDEV_POP/VARIANCE_POP for single row will still return a 0 since
this does not involve  a division by 0. This matches the postgres
behavior.

Change-Id: Ide8af752cd8a2e554a2cd5a1ec948967a80de1fe
Reviewed-on: http://gerrit.cloudera.org:8080/5800
Reviewed-by: Matthew Jacobs <mj@cloudera.com>
Tested-by: Impala Public Jenkins

2017-02-07 04:19:06 +00:00

..

queries

IMPALA-4738: STDDEV_SAMP should return NULL for single record input

2017-02-07 04:19:06 +00:00

functional-query_core.csv

IMPALA-3718: Support subset of functional-query for Kudu

2016-09-14 22:11:04 +00:00

functional-query_dimensions.csv

Starting Kudu as part of the run-all.sh command / data loading

2015-06-01 15:53:34 -07:00

functional-query_exhaustive.csv

IMPALA-3718: Support subset of functional-query for Kudu

2016-09-14 22:11:04 +00:00

functional-query_pairwise.csv

IMPALA-3718: Support subset of functional-query for Kudu

2016-09-14 22:11:04 +00:00