columnar::TestUtils::ColumnReaderOutputMet Node1 columnar::TestUtils ::ColumnReaderOutputMet + termNames + offsetColumns + offsets + namesOffsets + namesData + namesHash + ColumnReaderOutputMet() + connect() + clearColumns() + getEntry() + setData() + getPerfData() + collectColumnData() Node2 columnar::TestUtils ::ColumnReader + outputColumns + ~ColumnReader() + connect() + connectColumnIndices() + clearColumns() + getEntry() + setData() + getPerfData() + collectColumnData() Node2->Node1