```
public class FilterContext
extends Object
```
The FilterContext class encapsulates the information of a filter in the query. Both WHERE clause and HAVING clause are modeled as a filter.

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`equals(Object o)`
`List<FilterContext>`	`getChildren()`
`void`	`getColumns(Set<String> columns)`	Adds the columns (IDENTIFIER expressions) in the filter to the given set.
`Predicate`	`getPredicate()`
`FilterContext.Type`	`getType()`
`int`	`hashCode()`
`String`	`toString()`

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

public FilterContext(FilterContext.Type type,
                     List<FilterContext> children,
                     Predicate predicate)

public List<FilterContext> getChildren()

getColumns
```
public void getColumns(Set<String> columns)
```
Adds the columns (IDENTIFIER expressions) in the filter to the given set.

Class FilterContext