Bikramjeet Vig 94236ff2ff 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
Reviewed-on: http://gerrit.cloudera.org:8080/7822
Reviewed-by: Bikramjeet Vig <bikramjeet.vig@cloudera.com>
Tested-by: Impala Public Jenkins

2017-11-07 04:34:26 +00:00

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