| Class | Description | 
|---|---|
| ReaderColumnSelection | Base class for all column selection readers. | 
| ReaderColumnSelectionBitSet | |
| ReaderColumnSelectionDenseMultiBlock | |
| ReaderColumnSelectionDenseMultiBlockTransposed | |
| ReaderColumnSelectionDenseSingleBlock | |
| ReaderColumnSelectionDenseSingleBlockTransposed | |
| ReaderColumnSelectionSparse | Used to extract the values at certain indexes from each row in a sparse matrix
 
 Keeps returning all-zeros arrays until reaching the last possible index. | 
| ReaderColumnSelectionSparseTransposed | Used to extract the values at certain indexes from each row in a sparse matrix
 
 Keeps returning all-zeros arrays until reaching the last possible index. | 
| ReaderCompressedSelection | 
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