Support variables for variables for composing data flows
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Key: HIVE-611
URL: https://issues.apache.org/jira/browse/HIVE-611
Project: Hadoop Hive
Issue Type: New Feature
Components: Query Processor
Reporter: Ashish Thusoo
Assignee: Ashish Thusoo
This is similar to SCOPEs use of variables for composing data flows. With this
capability Hive should be able to support things like
X = select c1, c2 from T;
Y = select X.c1 as c1, T2.c1 as c2 from X join T2 on (T2.c2 = X.c2);
Z = select Y.c1, count(1) from Y group by Y.c1
This can be also achieved through views though one minor difference is that the
data variables X, Y and Z are local to the session whereas views are global is
scope (though you can also have session specific views).
Thoughts?
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