```
public class HiveCnfHelper
extends Object
```
All functions in this class were basically adopted from Apache Hive and modified to use them in Druid. See https://github.com/apache/hive/blob/branch-2.0/storage-api/src/java/org/apache/hadoop/hive/ql/io/sarg/SearchArgumentImpl.java for original implementation.

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static Filter`	`convertToCnf(Filter current)`
`static Filter`	`flatten(Filter root)`
`static Filter`	`pushDownNot(Filter current)`

public static Filter pushDownNot(Filter current)

public static Filter convertToCnf(Filter current)
                           throws CNFFilterExplosionException

public static Filter flatten(Filter root)

Class HiveCnfHelper