Xiao Li f7cf2096fd [SPARK-20941][SQL] Fix SubqueryExec Reuse ... ### What changes were proposed in this pull request? Before this PR, Subquery reuse does not work. Below are three issues: - Subquery reuse does not work. - It is sharing the same `SQLConf` (`spark.sql.exchange.reuse`) with the one for Exchange Reuse. - No test case covers the rule Subquery reuse. This PR is to fix the above three issues. - Ignored the physical operator `SubqueryExec` when comparing two plans. - Added a dedicated conf `spark.sql.subqueries.reuse` for controlling Subquery Reuse - Added a test case for verifying the behavior ### How was this patch tested? N/A Author: Xiao Li <gatorsmile@gmail.com> Closes #18169 from gatorsmile/subqueryReuse.		2017-06-01 09:52:18 -07:00
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main	[SPARK-20941][SQL] Fix SubqueryExec Reuse	2017-06-01 09:52:18 -07:00
test	[SPARK-20941][SQL] Fix SubqueryExec Reuse	2017-06-01 09:52:18 -07:00