Herman van Hövell tot Westerflier 1f8f2b5c2a [SPARK-15370][SQL] Fix count bug ... # What changes were proposed in this pull request? This pull request fixes the COUNT bug in the `RewriteCorrelatedScalarSubquery` rule. After this change, the rule tests the expression at the root of the correlated subquery to determine whether the expression returns `NULL` on empty input. If the expression does not return `NULL`, the rule generates additional logic in the `Project` operator above the rewritten subquery. This additional logic intercepts `NULL` values coming from the outer join and replaces them with the value that the subquery's expression would return on empty input. This PR takes over https://github.com/apache/spark/pull/13155. It only fixes an issue with `Literal` construction and style issues. All credits should go frreiss. # How was this patch tested? Added regression tests to cover all branches of the updated rule (see changes to `SubquerySuite`). Ran all existing automated regression tests after merging with latest trunk. Author: frreiss <frreiss@us.ibm.com> Author: Herman van Hovell <hvanhovell@databricks.com> Closes #13629 from hvanhovell/SPARK-15370-cleanup.		2016-06-12 21:30:32 -07:00
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src	[SPARK-15370][SQL] Fix count bug	2016-06-12 21:30:32 -07:00
pom.xml	[SPARK-15290][BUILD] Move annotations, like @Since / @DeveloperApi, into spark-tags	2016-05-17 09:55:53 +01:00