Impala Public Jenkins has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/9140 )

Change subject: IMPALA-6113: Skip row groups with predicates on NULL columns
......................................................................

IMPALA-6113: Skip row groups with predicates on NULL columns

Based on the existing Parquet column chunk level statistics null_count,
Impala's Parquet scanner is enhanced to skip an entire row group if the
null_count statistics indicate that all the values under the predicated
column are NULL as we wouldn't get any result rows from that row group
anyway.

Change-Id: I141317af0e0df30da8f220b29b0bfba364f40ddf
Reviewed-on: http://gerrit.cloudera.org:8080/9140
Reviewed-by: Tim Armstrong <tarmstr...@cloudera.com>
Tested-by: Impala Public Jenkins
---
M be/src/exec/hdfs-parquet-scanner.cc
M be/src/exec/parquet-column-stats.cc
M be/src/exec/parquet-column-stats.h
M testdata/workloads/functional-query/queries/QueryTest/parquet-stats.test
4 files changed, 59 insertions(+), 0 deletions(-)

Approvals:
  Tim Armstrong: Looks good to me, approved
  Impala Public Jenkins: Verified

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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: I141317af0e0df30da8f220b29b0bfba364f40ddf
Gerrit-Change-Number: 9140
Gerrit-PatchSet: 9
Gerrit-Owner: Gabor Kaszab <gaborkas...@cloudera.com>
Gerrit-Reviewer: Gabor Kaszab <gaborkas...@cloudera.com>
Gerrit-Reviewer: Impala Public Jenkins
Gerrit-Reviewer: Lars Volker <l...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <tarmstr...@cloudera.com>
Gerrit-Reviewer: Zoltan Borok-Nagy <borokna...@cloudera.com>
Gerrit-Reviewer: anujphadke <apha...@cloudera.com>

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