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FIRST_VALUE with row offsets preceding did not produce the correct results. This fix changes the rewrite for FIRST_VALUE and adds additional handling for NULLs in the backend. Change-Id: I03d54c05f63f46e9adb467008fa876ab33812c7b Reviewed-on: http://gerrit.sjc.cloudera.com:8080/4648 Reviewed-by: Matthew Jacobs <mj@cloudera.com> Tested-by: jenkins