variable to be assigned with an atomic value from a query
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                 Key: HIVE-2165
                 URL: https://issues.apache.org/jira/browse/HIVE-2165
             Project: Hive
          Issue Type: Sub-task
            Reporter: Ning Zhang


Currently variable can only be assigned by a constant. There are cases where a 
query generate a single value that should be used by the second query. It would 
be nice to assign this value to a variable and pass it to the second query. For 
exmaple:

{code}
hive> set x_avg = `select avg(x) from T`;
hive> select my_udf(${hiveconf:x_avg}, y) from T2;
{code}


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