[SPARK-13306] [SQL] uncorrelated scalar subquery#11190

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davies wants to merge 9 commits intoapache:masterfrom

davies:scalar_subquery

Commits on Feb 12, 2016

uncorrelated scalar subquery
Davies Liu
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add missing file
Davies Liu
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use broadcastTimeout
Davies Liu
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Commits on Feb 13, 2016

address comments
Davies Liu
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Commits on Feb 20, 2016

improve explain on subquery
Davies Liu
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address comments
Davies Liu
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add tests and codegen
Davies Liu
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move wait subqueries into execute()/produce()
Davies Liu
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Commits on Feb 21, 2016

address comments
Davies Liu
committed