CalciteCnfHelper (druid-processing 28.0.0 API)

java.lang.Object
- org.apache.druid.segment.filter.cnf.CalciteCnfHelper

```
public class CalciteCnfHelper
extends Object
```
All functions in this class were basically adopted from Apache Calcite and modified to use them in Druid. See https://github.com/apache/calcite/blob/branch-1.21/core/src/main/java/org/apache/calcite/rex/RexUtil.java#L1615 for original implementation.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static List<Filter>`	`conjunctions(Filter rexPredicate)`	Returns a condition decomposed by AND.
`static void`	`decomposeConjunction(Filter rexPredicate, List<Filter> rexList)`	Decomposes a predicate into a list of expressions that are AND'ed together.
`static Filter`	`pull(Filter rex)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - pull
```
public static Filter pull(Filter rex)
```
  - conjunctions
```
public static List<Filter> conjunctions(Filter rexPredicate)
```
    Returns a condition decomposed by AND.
    For example, conjunctions(TRUE) returns the empty list; conjunctions(FALSE) returns list {FALSE}.
  - decomposeConjunction
```
public static void decomposeConjunction(Filter rexPredicate,
                                        List<Filter> rexList)
```
    Decomposes a predicate into a list of expressions that are AND'ed together.
    
    Parameters:
    
    rexPredicate - predicate to be analyzed
    
    rexList - list of decomposed RexNodes