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https://issues.apache.org/jira/browse/PIG-3805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13935321#comment-13935321
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Jenny Thompson commented on PIG-3805:
-------------------------------------
That only tests the exec function of ToString, not the getArgToFuncMapping
functions. This means that when using the Pig script
"ToString(ToDate('2009-01-07T01:07:01.000Z'))" I get the error:
Caused by: org.apache.pig.impl.logicalLayer.validators.TypeCheckerException:
ERROR 1045:
<line 2, column 144> Could not infer the matching function for
org.apache.pig.builtin.ToString as multiple or none of them fit. Please use an
explicit cast.
at
org.apache.pig.newplan.logical.visitor.TypeCheckingExpVisitor.visit(TypeCheckingExpVisitor.java:784)
though
ToDate('2009-01-07T01:07:01.000Z') works fine.
> ToString(datetime [, format string]) doesn't work without the second argument
> -----------------------------------------------------------------------------
>
> Key: PIG-3805
> URL: https://issues.apache.org/jira/browse/PIG-3805
> Project: Pig
> Issue Type: Bug
> Components: internal-udfs
> Affects Versions: 0.12.0
> Reporter: Jenny Thompson
> Priority: Minor
> Labels: easyfix
>
> The exec function of ToString is written to handle 1 or 2 arguments (it
> defaults to ISO, which is consistent with ToDate).
> However, the getArgToFuncMapping function returns only one FuncSpec,
> requiring the formatString argument.
> To fix: just return add another FuncSpec to getArcToFuncMapping.
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