GitHub user MickDavies opened a pull request:
https://github.com/apache/spark/pull/4139
SPARK-5309: Use Dictionary for Binary->String conversion
Use of Dictionary will reduce conversion overhead which is significant when
converting from Binary in UTF to Java String.
Dictionaries are use in Parquet where columns hold a limited set of values
which is often the case.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/MickDavies/spark SPARK-5309
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/4139.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 #4139
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commit 0af7c41e129afb630b351dea5f409ddc0c6d01ff
Author: Michael Davies <[email protected]>
Date: 2015-01-21T17:06:25Z
SPARK-5309: Use Dictionary for Binary->String conversion
Use of Dictionary will reduce conversion overhead which is significant when
converting from Binary in UTF to Java String.
Dictionaries are use in Parquet where columns hold a limited set of values
which is often the case.
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