GitHub user liancheng opened a pull request:
https://github.com/apache/spark/pull/8907
[SPARK-10811] [SQL] Eliminates unnecessary byte array copying
When reading Parquet string and binary-backed decimal values, Parquet
`Binary.getBytes` always returns a copied byte array, which is unnecessary.
Since the underlying implementation of `Binary` values there is guaranteed to
be `ByteArraySliceBackedBinary`, we can use `Binary.toByteBuffer.array()` to
steal the underlying byte array without copying it.
This brings performance benefits when scanning Parquet string and
binary-backed decimal columns. Note that, this trick doesn't cover
binary-backed decimals with precision greater than 18.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/liancheng/spark
spark-10811/eliminate-array-copying
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/8907.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 #8907
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commit b99158e29878f5ba73b0beb3c19f33429ecd30cd
Author: Cheng Lian <[email protected]>
Date: 2015-09-24T20:41:10Z
Eliminates unnecessary byte array copying
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