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This commit fixes the issue where querying a view produces incorrect results if the view definition statement references the same column multiple times in the select list. In that case, a predicate referencing the same slot is generated when equivalences among view slots are enforced, thereby causing null values to be rejected. Change-Id: I3d13656141fb41d232ddd38562cbde277f2a1264 Reviewed-on: http://gerrit.sjc.cloudera.com:8080/5031 Reviewed-by: Dimitris Tsirogiannis <dtsirogiannis@cloudera.com> Tested-by: jenkins