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https://issues.apache.org/jira/browse/TAJO-1403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14366731#comment-14366731
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ASF GitHub Bot commented on TAJO-1403:
--------------------------------------
GitHub user dongjoon-hyun opened a pull request:
https://github.com/apache/tajo/pull/431
TAJO-1403: Improve 'Simple Query' with only partition columns and consta...
Please see https://issues.apache.org/jira/browse/TAJO-1403.
Tested by the following command.
```
mvn clean install -Pparallel-test,hcatalog-0.12.0 -DLOG_LEVEL=ERROR
-Dmaven.fork.count=2
----
Tests run: 1376, Failures: 0, Errors: 0, Skipped: 0
```
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dongjoon-hyun/tajo TAJO-1403
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/tajo/pull/431.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 #431
----
commit 50f1751b97dacec30c98b7c3c3cd74f9f3151a09
Author: Dongjoon Hyun <[email protected]>
Date: 2015-03-18T06:41:51Z
TAJO-1403: Improve 'Simple Query' with only partition columns and constant
values
----
> Improve 'Simple Query' with only partition columns and constant values
> ----------------------------------------------------------------------
>
> Key: TAJO-1403
> URL: https://issues.apache.org/jira/browse/TAJO-1403
> Project: Tajo
> Issue Type: Improvement
> Reporter: Dongjoon Hyun
> Assignee: Dongjoon Hyun
> Fix For: 0.11.0
>
>
> Tajo shows a very fast response for a simple query (
> https://cwiki.apache.org/confluence/display/TAJO/Simple+Query+and+Forwarded+Query)
> like the followings.
> {code:sql}
> select * from t1 limit 10;
> {code}
> However, in many cases, tables have partitions.
> {code:sql}
> create external table t1(id int) using csv with ('csvfile.delimiter'='|')
> partition by column(dt text) location '/data';
> select * from t1 where dt='2015-03-15' limit 10;
> {code}
> If all predicates in WHERE consist of partition columns and 'EQUAL'
> predicates with constant values, I think Tajo can handle these cases very
> fast.
> This kind of queries is very popular for DevOps users and simple ETL apps.
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