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From "Jason Dere (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-5203) FunctionRegistry.getMethodInternal() should prefer method arguments with closer affinity to the original argument types
Date Wed, 04 Sep 2013 00:05:51 GMT
Jason Dere created HIVE-5203:
--------------------------------

             Summary: 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


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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