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https://issues.apache.org/jira/browse/PIG-2303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13115082#comment-13115082
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Graham Lea commented on PIG-2303:
---------------------------------
Hi Daniel.
If you just add a schema to the definition of 'C' in your own script, you will
see the problem:
{code}
C = foreach B generate MAX(A.name) as maxName: chararray;
{code}
Result:
{noformat}
ERROR 1022: Type mismatch merging schema prefix. Field Schema: double. Other
Field Schema: maxName: chararray
{noformat}
Interestingly, without the schema a describe of C produces "C: {chararray}".
So it seems that the type of the function is correct (chararray in, chararray
out) but perhaps the schema processing of FOREACH is incorrectly inferring the
result type to be double?
> Documentation says the MAX function can be used on chararray, but it can't
> --------------------------------------------------------------------------
>
> Key: PIG-2303
> URL: https://issues.apache.org/jira/browse/PIG-2303
> Project: Pig
> Issue Type: Bug
> Components: parser
> Affects Versions: 0.9.0
> Reporter: Graham Lea
> Priority: Trivial
>
> Here: http://pig.apache.org/docs/r0.9.0/func.html#max
> It says MIN/Max can be used on chararray, but the result of those functions
> is always a double.
> Had to search through the Pig Javadoc to find that I should use
> StringMin/StringMax instead.
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