GitHub user liancheng opened a pull request:
https://github.com/apache/spark/pull/9040
[SPARK-11007] [SQL] Adds dictionary aware Parquet decimal converters
For Parquet decimal columns that are encoded using plain-dictionary
encoding, we can make the upper level converter aware of the dictionary, so
that we can pre-instantiate all the decimals to avoid duplicated instantiation.
Note that plain-dictionary encoding isn't available for
`FIXED_LEN_BYTE_ARRAY` for Parquet writer version `PARQUET_1_0`. So currently
only decimals written as `INT32` and `INT64` can benefit from this optimization.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/liancheng/spark
spark-11007.decimal-converter-dict-support
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/9040.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #9040
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