[Impala-ASF-CR] IMPALA-5061: Populate null count in parquet::statistics

["Pooja Nilangekar (Code Review)" <ge...@cloudera.org>]

Pooja Nilangekar has uploaded a new patch set (#3).

Change subject: IMPALA-5061: Populate null_count in parquet::statistics
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IMPALA-5061: Populate null_count in parquet::statistics

The null_count in the statistics field is updated each time a null
value is encountered by paquet table writer. The value is written
to the parquet header if it has one or more null values in the
row_group.

Testing: Modified the existing end-to-end test in the
test_insert_parquet.py file to make sure each parquet header has
the appropriate null_count. Verified the correctness of the nulltable
test and added an additional test which populates a parquet file with
the functional_parquet.zipcode_incomes table and ensures that the
expected null_count is populated.

Change-Id: I4c49a63af84c2234f0633be63206cb52eb7e8ebb
---
M be/src/exec/hdfs-parquet-scanner.cc
M be/src/exec/hdfs-parquet-table-writer.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 tests/query_test/test_insert_parquet.py
6 files changed, 180 insertions(+), 100 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/58/7058/3
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I4c49a63af84c2234f0633be63206cb52eb7e8ebb
Gerrit-PatchSet: 3
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Pooja Nilangekar <po...@cloudera.com>
Gerrit-Reviewer: Lars Volker <lv...@cloudera.com>