[Impala-ASF-CR] IMPALA-2494: Support for byte array encoded decimals in Parquet scanner

["Bikramjeet Vig (Code Review)" <ge...@cloudera.org>]

Hello Lars Volker, Matthew Jacobs, Tim Armstrong, Dan Hecht, 

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

    http://gerrit.cloudera.org:8080/7822

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

Change subject: IMPALA-2494: Support for byte array encoded decimals in Parquet scanner
......................................................................

IMPALA-2494: Support for byte array encoded decimals in Parquet scanner

Extendes parquet column reader and associated classes to allow for more
than one possible physical type for a given logical type. This patch
only adds support for variable sized byte array encoded decimals and
more will be added in upcoming commits.
Also, column level metadata verification which was currently being
done per row group will now only be done once per column per file.

Testing:
Added backend test for verifying newly added decimal types are decoded
correctly.
Added Query test that decodes both plain and dictionary-encoded
decimals using binary encoding.

Performance:
Initial perf testing using tpcds_1000 shows no regression.

Change-Id: I2c0e881045109f337fecba53fec21f9cfb9e619e
---
M be/src/exec/data-source-scan-node.cc
M be/src/exec/hdfs-parquet-scanner.cc
M be/src/exec/hdfs-parquet-scanner.h
M be/src/exec/parquet-column-readers.cc
M be/src/exec/parquet-column-stats.cc
M be/src/exec/parquet-column-stats.h
M be/src/exec/parquet-column-stats.inline.h
M be/src/exec/parquet-common.h
M be/src/exec/parquet-metadata-utils.cc
M be/src/exec/parquet-metadata-utils.h
M be/src/exec/parquet-plain-test.cc
M be/src/util/dict-encoding.h
M be/src/util/dict-test.cc
A testdata/data/binary_decimal_dictionary.parquet
A testdata/data/binary_decimal_no_dictionary.parquet
A testdata/workloads/functional-query/queries/QueryTest/parquet-decimal-formats.test
M tests/query_test/test_scanners.py
17 files changed, 622 insertions(+), 259 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/22/7822/4
-- 
To view, visit http://gerrit.cloudera.org:8080/7822
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I2c0e881045109f337fecba53fec21f9cfb9e619e
Gerrit-Change-Number: 7822
Gerrit-PatchSet: 4
Gerrit-Owner: Bikramjeet Vig <bi...@cloudera.com>
Gerrit-Reviewer: Bikramjeet Vig <bi...@cloudera.com>
Gerrit-Reviewer: Dan Hecht <dh...@cloudera.com>
Gerrit-Reviewer: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Matthew Jacobs <mj...@apache.org>
Gerrit-Reviewer: Tim Armstrong <ta...@cloudera.com>