Github user haiyangsea commented on the pull request:
https://github.com/apache/spark/pull/4929#issuecomment-77516194
CTE support:
with q1 as ( select key from src where key = '5')
select *
from q1;
with q1 as ( select key from q2 where key = '5'),
q2 as ( select key from src where key = '5')
select * from (select key from q1) a;
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