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https://issues.apache.org/jira/browse/TAJO-378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13906659#comment-13906659
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Jaehwa Jung commented on TAJO-378:
----------------------------------
I'm sorry about late patch.
First, 'mvn clean install' finished unsuccessfully. I found a error message as
follows:
{code:xml}
Tests in error:
testConcat_ws(org.apache.tajo.engine.function.TestStringOperatorsAndFunctions):
function concat_ws(text,text,text) does not exist
{code}
Second, I recommend to use StringBuilder instead of String at _Concat_ws_
because concat method of _java.lang.String_ always returns new String Object.
So, String objects will be targets for GC.
> Implement concat_ws function.
> -----------------------------
>
> Key: TAJO-378
> URL: https://issues.apache.org/jira/browse/TAJO-378
> Project: Tajo
> Issue Type: New Feature
> Affects Versions: 0.8-incubating
> Reporter: Seungun Choe
> Assignee: Seungun Choe
> Priority: Minor
> Fix For: 0.8-incubating
>
> Attachments: TAJO-378.patch
>
>
> This function's definition is, concat_ws(sep text, str "any" [, str "any" [,
> ...] ]).
> For example, concat_ws(',', 'abcde', 2, NULL, 22)'s result is abcde,2,22.
> Detailed description is "Concatenate all but first arguments with separators.
> The first parameter is used as a separator. NULL arguments are ignored.".
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