| Class | Description | 
|---|---|
| AColGroup | Abstract Class that is the lowest class type for the Compression framework. | 
| ColGroupCompressed | Base class for column groups encoded Encoded in a compressed manner. | 
| ColGroupConst | |
| ColGroupDDC | Class to encapsulate information about a column group that is encoded with dense dictionary encoding (DDC). | 
| ColGroupEmpty | |
| 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. | 
| ColGroupSDC | Column group that sparsely encodes the dictionary values. | 
| ColGroupSDCSingle | Column group that sparsely encodes the dictionary values. | 
| ColGroupSDCSingleZeros | Column group that sparsely encodes the dictionary values. | 
| ColGroupSDCZeros | Column group that sparsely encodes the dictionary values. | 
| 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. | 
| Enum | Description | 
|---|---|
| AColGroup.CompressionType | Public super types of compression ColGroups supported | 
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