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From jinfengni <...@git.apache.org>
Subject [GitHub] drill pull request: DRILL-4279: Improve query performance when no ...
Date Thu, 28 Jan 2016 04:51:17 GMT
GitHub user jinfengni opened a pull request:

    https://github.com/apache/drill/pull/342

    DRILL-4279: Improve query performance when no column is required from…

    … scan operator.
    
    Use different approaches, when no column is not required from scan operator.
    1) If data source is schemed, use the first column in the schema.
    2) Use 'columns[0]' for text reader.
    3) Use the current skip_all reader for JSON input.
    4) Use a default column name for other schema-less input.

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/jinfengni/incubator-drill DRILL-4279

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/drill/pull/342.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 #342
    
----
commit 137f593bc70b484e97ab6838fc5a639267c2bf40
Author: Jinfeng Ni <jni@apache.org>
Date:   2016-01-20T00:47:08Z

    DRILL-4279: Improve query performance when no column is required from scan operator.
    
    Use different approaches, when no column is not required from scan operator.
    1) If data source is schemed, use the first column in the schema.
    2) Use 'columns[0]' for text reader.
    3) Use the current skip_all reader for JSON input.
    4) Use a default column name for other schema-less input.

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