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* Ability to directly query row-based datasources. Includes: - Foundational classes RowBasedSegment, RowBasedStorageAdapter, RowBasedCursor provide a queryable interface on top of a RowBasedColumnSelectorFactory. - Add LookupSegment: A RowBasedSegment that is built on lookup data. - Improve capability reporting in RowBasedColumnSelectorFactory. * Fix import. * Remove unthrown IOException.