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https://issues.apache.org/jira/browse/TAJO-341?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13835626#comment-13835626
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Hudson commented on TAJO-341:
-----------------------------
SUCCESS: Integrated in Tajo-trunk-postcommit #573 (See
[https://builds.apache.org/job/Tajo-trunk-postcommit/573/])
TAJO-341: Implement substr function. (hyoungjunkim via hyunsik) (hyunsik:
https://git-wip-us.apache.org/repos/asf?p=incubator-tajo.git&a=commit&h=f9a6e9ca3dbfc7c518ad6f0d3b1c9fe3196b654e)
*
tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/function/string/Substr.java
*
tajo-core/tajo-core-backend/src/test/java/org/apache/tajo/engine/function/TestStringOperatorsAndFunctions.java
* CHANGES.txt
*
tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/master/TajoMaster.java
> Implement substr function
> -------------------------
>
> Key: TAJO-341
> URL: https://issues.apache.org/jira/browse/TAJO-341
> Project: Tajo
> Issue Type: New Feature
> Components: operator/function/udf
> Reporter: Hyunsik Choi
> Assignee: hyoungjunkim
> Priority: Minor
> Fix For: 0.8-incubating
>
> Attachments: TAJO-341.patch
>
>
> h3. Function Definition
> {code}
> text substr(string text, from int4 [, count int4])
> {code}
> h3. Description
> * It extracts substring (same as substring(string from from for count)).
> * If string is null, the result also should be null.
> * Note that *from* is one based index.
> * *from* can be negative integer.
> * *count* can be omitted. If then, all string after *from* will be returned.
> * *count* cannot be negative integer.
> * If *count* is 0, the result should be '' instead of null.
> h3. Example and Sementic
> {code}
> hyunsik=> select substr('abcdef', 3, 2);
> substr
> --------
> cd
> (1 row)
> hyunsik=> select substr('abcdef',3) ;
> substr
> --------
> cdef
> (1 row)
> hyunsik=> select substr('abcdef',1,1) ;
> substr
> --------
> a
> (1 row)
> hyunsik=> select substr('abcdef',0,1) ;
> substr
> --------
>
> (1 row)
> hyunsik=> select substr('abcdef',0,2) ;
> substr
> --------
> a
> (1 row)
> {code}
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