GitHub user jinfengni opened a pull request:
https://github.com/apache/drill/pull/342
DRILL-4279: Improve query performance when no column is required fromâ¦
⦠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
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commit 137f593bc70b484e97ab6838fc5a639267c2bf40
Author: Jinfeng Ni <[email protected]>
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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