I might be wrong, but it seems like it wont be useful, as there is no
'list' Hive data type. Valid complex types are listed here:
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Types#LanguageManualTypes-ComplexTypes
As for complex literals, say if you want to test a udf that operate on an
array, you can make one using array UDF (ie, array('a', 'b', 'c').
Hope that helps
Szehon
On Thu, Apr 10, 2014 at 4:06 AM, Ng, Raymond <raymond...@baesystems.com>wrote:
> Hi all
>
>
>
> I'm trying to find out if its possible to pass in a List in a SELECT
> statement to be used by the "evaluate" method of a UDF using
> ListObjectInspector on DeferredObject array?
>
>
>
> I've followed some instructions to build a function which extends
> GenericUDF (code snippet on "evaluate" method below), its completed and
> unit tested, and deployed onto Hive via the ADD JAR and CREATE TEMPORARY
> FUNCTION utilities.
>
>
>
> public class TestUdf extends GenericUDF
>
>
>
> private ListObjectInspector listOI;
>
>
>
> @Override
>
> *public* Object evaluate(*final* DeferredObject[] arguments)
> *throws*HiveException {
>
> // get the list and string from the deferred objects using the
> object inspectors
>
> List<String> argValList = *(List<String>) **this**.**listOI*
> *.getList(arguments[1].get())*;
>
> ....
>
>
>
> Now I need a way to test it by running a SELECT statement like
>
>
>
> select col1, testudf(col2, List(col3,col4,col5)) from table1;
>
>
>
> is it possible?
>
>
>
> Thanks
>
> Raymond
> Please consider the environment before printing this email. This message
> should be regarded as confidential. If you have received this email in
> error please notify the sender and destroy it immediately. Statements of
> intent shall only become binding when confirmed in hard copy by an
> authorised signatory. The contents of this email may relate to dealings
> with other companies under the control of BAE Systems Applied Intelligence
> Limited, details of which can be found at
> http://www.baesystems.com/Businesses/index.htm.
>
