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Hive >> mail # user >> Calling same UDF multiple times in a SELECT query

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Calling same UDF multiple times in a SELECT query

V r using version hive-exec-0.9.0-cdh4.1.2 in production

I need to check and use the output from a UDF in a query to assign values to 2 columns in a SELECT query


     IF(fooUdf(a) < -1  , -1, fooUdf(a)) as b,
     IF(fooUdf(a) < -1  , fooUdf(a), 0) as c
So will fooUdf be called 4 times ? Or once ?

Why this is important is because in our case this UDF calls a web service and I don't want so many calls to the service.



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Nitin Pawar 2013-07-23, 19:25
Sanjay Subramanian 2013-07-23, 19:49
Jan Dolinár 2013-07-23, 19:35
Sanjay Subramanian 2013-07-23, 19:57
Navis류승우 2013-07-24, 00:14