GitHub user chunhui-shi opened a pull request:
https://github.com/apache/drill/pull/638
DRILL-4982: Separate Hive reader classes for different data formats tâ¦
â¦o improve performance.
1, Separating Hive reader classes allows optimization to apply on different
classes in optimized ways. This separation effectively avoid the performance
degradation of scan.
2, Do not apply Skip footer/header mechanism on most Hive formats. This
skip mechanism introduces extra checks on each incoming records.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/chunhui-shi/drill DRILL-4982
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/drill/pull/638.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 #638
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commit 1e240a0dfea7970798bd550204388fc0e9bc3d42
Author: chunhui-shi <c...@maprtech.com>
Date: 2016-10-30T08:29:06Z
DRILL-4982: Separate Hive reader classes for different data formats to
improve performance.
1, Separating Hive reader classes allows optimization to apply on different
classes in optimized ways. This separation effectively avoid the performance
degradation of scan.
2, Do not apply Skip footer/header mechanism on most Hive formats. This
skip mechanism introduces extra checks on each incoming records.
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