| Class | Description | 
|---|---|
| ADictionary | This dictionary class aims to encapsulate the storage and operations over unique floating point values of a column
 group. | 
| ColGroup | Class that stores information about a column group within a compressed matrix block. | 
| ColGroupConverter | Utility functions for ColGroup to convert ColGroups or MatrixBlocks. | 
| ColGroupDDC | Class to encapsulate information about a column group that is encoded with dense dictionary encoding (DDC). | 
| ColGroupDDC1 | Class to encapsulate information about a column group that is encoded with dense dictionary encoding (DDC) using 1
 byte codes. | 
| ColGroupDDC2 | Class to encapsulate information about a column group that is encoded with dense dictionary encoding (DDC) using 2
 byte codes. | 
| ColGroupFactory | Factory pattern for constructing ColGroups. | 
| ColGroupIO | This has the IO responsibility of ColGroups, such that it enables to read and write ColGroups to and from a DataInput
 and DataOutput | 
| ColGroupOffset | Base class for column groups encoded with various types of bitmap encoding. | 
| ColGroupOLE | Class to encapsulate information about a column group that is encoded with simple lists of offsets for each set of
 distinct values. | 
| ColGroupRLE | A group of columns compressed with a single run-length encoded bitmap. | 
| ColGroupSizes | |
| ColGroupUncompressed | Column group type for columns that are stored as dense arrays of doubles. | 
| ColGroupValue | Base class for column groups encoded with value dictionary. | 
| DenseRowIterator | |
| Dictionary | This dictionary class aims to encapsulate the storage and operations over unique floating point values of a column
 group. | 
| QDictionary | This dictionary class aims to encapsulate the storage and operations over unique floating point values of a column
 group. | 
| SparseRowIterator | 
| Enum | Description | 
|---|---|
| ColGroup.CompressionType | Public Group types supported
 
 Note For instance DDC is called DDC not DDC1, or DDC2 which is a specific subtype of the DDC. | 
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