> set hive.execution.engine=mr;
 
> select * from test_table;  --gives empty table
 
> Any ideas on why this must be happening? This issue does not occur when
>I don¹t use a ³union all² query.
 

What is the value of the parameter
mapreduce.input.fileinputformat.input.dir.recursive in your
mapred-site.xml?

Cheers,
Gopal


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