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Commit cfe1ba56 authored by Liang-Chi Hsieh's avatar Liang-Chi Hsieh Committed by Davies Liu
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[SPARK-12687] [SQL] Support from clause surrounded by `()`.

JIRA: https://issues.apache.org/jira/browse/SPARK-12687

Some queries such as `(select 1 as a) union (select 2 as a)` can't work. This patch fixes it.

Author: Liang-Chi Hsieh <viirya@gmail.com>

Closes #10660 from viirya/fix-union.
parent b9c83533
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