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https://issues.apache.org/jira/browse/HIVE-5203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13757544#comment-13757544
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Ashutosh Chauhan commented on HIVE-5203:
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Jason's rationale for this change and subsequent explanation sounds reasonable
to me. +1
> FunctionRegistry.getMethodInternal() should prefer method arguments with
> closer affinity to the original argument types
> -----------------------------------------------------------------------------------------------------------------------
>
> Key: HIVE-5203
> URL: https://issues.apache.org/jira/browse/HIVE-5203
> Project: Hive
> Issue Type: Bug
> Components: Types, UDF
> Reporter: Jason Dere
> Assignee: Jason Dere
> Attachments: HIVE-5203.1.patch
>
>
> When the function registry is trying to determine the best version of UDF
> evaluate() to use based on a set of arguments passed in, it should prefer
> methods where the argument types are more related to the original types. For
> example if varchar is used with UDFFromUnixTime(), varchar is convertible to
> both the double and string versions of evaluate() for that UDF. In this case
> we would prefer that the function registry select the string version over the
> double version, since varchar and string are both string types.
> This doesn't really affect any of the existing types, but comes into play
> with the addition of the varchar type (HIVE-4844).
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