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https://issues.apache.org/jira/browse/PIG-3349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13754150#comment-13754150
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Daniel Dai commented on PIG-3349:
---------------------------------
+1. We also need to complete type conversion table later.
> Document ToString(Datetime, String) UDF
> ---------------------------------------
>
> Key: PIG-3349
> URL: https://issues.apache.org/jira/browse/PIG-3349
> Project: Pig
> Issue Type: Bug
> Components: documentation
> Affects Versions: 0.11.1
> Reporter: pat chan
> Assignee: Cheolsoo Park
> Priority: Minor
> Fix For: 0.12
>
> Attachments: PIG-3349.patch
>
>
> Currently you can't cast a datetimeobject into a chararray:
> grunt> B = foreach A generate (chararray)a; dump B;
> 2013-06-05 15:29:01,372 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR
> 1052:
> <line 8, column 24> Cannot cast datetime to chararray
> Details at logfile: /Users/patc/projects/pig-0.11.1/pig_1370471270879.log
> Was this an oversight? The documented casting matrix does not show the
> datetime object so I'm not sure if the current behavior is correct or not.
> My recommendation would be to support casting to and from strings. Casting
> from a string would behave exactly like loading a datetime. Casting to a
> string would be exactly the format you get when you dump a datetime.
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