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Hive >> mail # user >> Execution of udf


Select col1,myudf(col2,col3) from table1;
In what phase if map reduce an udf is executed.

In the very beginning, I assumed that hive will be joining two tables.,
getting the required columns and then applies udf on columns specified
I.e., essentially on reducer phase . But later on I realised that I was

Is there any specific parameter which suggests hive to call udf at reducer
phase rather than at Mapper phase.
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