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This enables the existing subquery rewrite rules to rewrite UNION statements. UNION rewriting is easily done by simply calling the rewriter for each operand in the UNION. At least one TPC-DS query requires this functionality (IMPALA-1365). The more difficult case of a UNION within a subquery is still not supported. Change-Id: I7f83eed0eb8ae81565e629f09f6918a4ba86ee13 Reviewed-on: http://gerrit.sjc.cloudera.com:8080/4859 Reviewed-by: Casey Ching <casey@cloudera.com> Tested-by: jenkins
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