Csaba Ringhofer has uploaded this change for review. ( 
http://gerrit.cloudera.org:8080/9403


Change subject: IMPALA-6324: Support reading RLE-encoded boolean values in 
Parquet scanner
......................................................................

IMPALA-6324: Support reading RLE-encoded boolean values in Parquet scanner

Impala already supported RLE encoding for levels and dictionary pages, so
the only task was to integrate it into BoolColumnReader.

There might be a small performance impact on PLAIN encoded booleans,
because of the addittional branch when the cache of BoolColumnReader is
filled. As the cache size is 128, I considered this to be outside the
"hot loop", but some performance measurement may be needed to validate
this.

Testing:

As Impala cannot write RLE encoded bool columns at the moment, parquet-mr
was used to create a test file, testdata/data/rle_encoded_bool.parquet

tests/query_test/test_scanners.py#test_rle_encoded_bools creates a table
and that uses this file, and tries to query into it.

Change-Id: I4644bf8cf5d2b7238b05076407fbf78ab5d2c14f
---
M be/src/exec/parquet-column-readers.cc
M be/src/exec/parquet-column-readers.h
M be/src/util/rle-encoding.h
M testdata/data/README
A testdata/data/rle_encoded_bool.parquet
A 
testdata/workloads/functional-query/queries/QueryTest/parquet-rle-encoded-bool.test
M tests/query_test/test_scanners.py
7 files changed, 101 insertions(+), 43 deletions(-)



  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/03/9403/1
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: I4644bf8cf5d2b7238b05076407fbf78ab5d2c14f
Gerrit-Change-Number: 9403
Gerrit-PatchSet: 1
Gerrit-Owner: Csaba Ringhofer <csringho...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <tarmstr...@cloudera.com>

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