[Impala-ASF-CR] IMPALA-6113: Skip row groups with predicates on NULL columns

["Gabor Kaszab (Code Review)" <ge...@cloudera.org>]

Hello Lars Volker, Zoltan Borok-Nagy, anujphadke, Tim Armstrong, 

I'd like you to reexamine a change. Please visit

    http://gerrit.cloudera.org:8080/9140

to look at the new patch set (#4).

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
---
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, 61 insertions(+), 0 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/40/9140/4
-- 
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I141317af0e0df30da8f220b29b0bfba364f40ddf
Gerrit-Change-Number: 9140
Gerrit-PatchSet: 4
Gerrit-Owner: Gabor Kaszab <ga...@cloudera.com>
Gerrit-Reviewer: Gabor Kaszab <ga...@cloudera.com>
Gerrit-Reviewer: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <ta...@cloudera.com>
Gerrit-Reviewer: Zoltan Borok-Nagy <bo...@cloudera.com>
Gerrit-Reviewer: anujphadke <ap...@cloudera.com>