## Uses of Class
org.apache.sysds.runtime.compress.colgroup.APreAgg

Packages that use APreAgg
org.apache.sysds.runtime.compress.colgroup

### Uses of APreAgg in org.apache.sysds.runtime.compress.colgroup

Subclasses of APreAgg in org.apache.sysds.runtime.compress.colgroup
`class` `ASDCZero`
`class` `ColGroupDDC` Class to encapsulate information about a column group that is encoded with dense dictionary encoding (DDC).
`class` `ColGroupDeltaDDC` Class to encapsulate information about a column group that is first delta encoded then encoded with dense dictionary encoding (DeltaDDC).
`class` `ColGroupSDCSingleZeros` Column group that sparsely encodes the dictionary values.
`class` `ColGroupSDCZeros` Column group that sparsely encodes the dictionary values.

Methods in org.apache.sysds.runtime.compress.colgroup with parameters of type APreAgg
`ADictionary` APreAgg.`preAggregateThatIndexStructure​(APreAgg that)` Pre aggregate into a dictionary.