Hello Matthew Jacobs,
I'd like you to reexamine a change. Please visit
http://gerrit.cloudera.org:8080/5800
to look at the new patch set (#3).
Change subject: IMPALA-4738: STDDEV_SAMP should return NULL for single record
input
......................................................................
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.
Change-Id: Ide8af752cd8a2e554a2cd5a1ec948967a80de1fe
---
M be/src/exprs/aggregate-functions-ir.cc
M testdata/workloads/functional-query/queries/QueryTest/aggregation.test
2 files changed, 9 insertions(+), 8 deletions(-)
git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/00/5800/3
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Ide8af752cd8a2e554a2cd5a1ec948967a80de1fe
Gerrit-PatchSet: 3
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: anujphadke <[email protected]>
Gerrit-Reviewer: Matthew Jacobs <[email protected]>
Gerrit-Reviewer: anujphadke <[email protected]>
