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Hive, mail # user - Parse MAP viarable Keys in HIVE


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Parse MAP viarable Keys in HIVE
R J 2013-07-25, 18:08
Hi All,

I have a table in Apache Hive and I am interested in a specific field of the table. Table name: Table1 and field name f1. The field f1 is of type MAP<string, string>.

The table is huge. How could I find the distinct key values of the MAP variable f1 above?

I tried:
$hive -e "select distinct map_keys(f1) from Table1;"
$hive -e "select k from Table1 LATERAL VIEW explode(f1) et as k,v;"

Each of the above returned syntax error. Could you please help.

If the existing values for a few fields of the table ate:
<x, y>
<x, p>
<m, n>
<empty>
<m, m>
<p, q>

I want the return to be:
x
m
p

Thanks a lot.