columnar::TestUtils::ColumnDataMetNames Node1 columnar::TestUtils ::ColumnDataMetNames + branchReader + offsets + columnData + columnHashData + benchmarkUnpack + benchmark + ColumnDataMetNames() + connect() + clearColumns() + getEntry() + setData() Node2 columnar::TestUtils ::IColumnData + outputColumns + ~IColumnData() + connect() + clearColumns() + getEntry() + setData() Node2->Node1