Jason Dere created HIVE-5203:
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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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