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Posted to dev@pig.apache.org by "Cheolsoo Park (JIRA)" <ji...@apache.org> on 2012/09/24 20:03:07 UTC
[jira] [Updated] (PIG-2929) CONCAT returns null when 1 items is
null
[ https://issues.apache.org/jira/browse/PIG-2929?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Cheolsoo Park updated PIG-2929:
-------------------------------
Attachment: PIG-2929.patch
Thank you very much for reporting an issue Nicholas!
In fact, this is documented [here|http://pig.apache.org/docs/r0.10.0/basic.html#nulls] although it is not very visible.
I am attaching a patch that updats the built-in function doc (including CONCAT, AVG, MIN, MAX, and SIZE) regarding nulls.
Regarding your suggestion of changing the behavior of CONCAT, even though it is total valid, I'm afraid that that could introduce backward incompatibilities. That is, some people may rely on that CONCAT returns nulls in their scripts. Given that this can be easily achieved by writing your own UDF, I prefer to keep the current behavior.
Please let me know if anyone thinks otherwise. Thanks!
> CONCAT returns null when 1 items is null
> ----------------------------------------
>
> Key: PIG-2929
> URL: https://issues.apache.org/jira/browse/PIG-2929
> Project: Pig
> Issue Type: Bug
> Components: documentation, internal-udfs
> Affects Versions: 0.9.0, 0.9.1, 0.9.2
> Reporter: Nicholas Verbeck
> Fix For: 0.11
>
> Attachments: PIG-2929.patch
>
>
> Just stumbled upon this issue over the weekend. It appears the built-in CONCAT function will return null in the advent of 1 item in the Tuple being null. If this is as intended it would be nice if the docs made note of this. Otherwise it would be nice if nulls where just skipped and a proper string of what was left was returned. If all items are null then just return null in that case.
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