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When HdfsParquetScanner::Open() failed we used to hit a DCHECK when trying to access HdfsParquetScanner::batch() which is only valid to call for non-MT scan nodes. Change-Id: Ifbfdde505dbbd2742e7ab79a2415ff317a9bfa2f Reviewed-on: http://gerrit.cloudera.org:8080/4851 Reviewed-by: Tim Armstrong <tarmstrong@cloudera.com> Tested-by: Internal Jenkins