ColumnCache (druid-processing 28.0.1 API)

java.lang.Object
- org.apache.druid.segment.ColumnCache

All Implemented Interfaces:

Expr.InputBindingInspector, ColumnInspector, ColumnSelector
```
public class ColumnCache
extends Object
implements ColumnSelector
```

Constructor Summary

Constructors
Constructor Description

ColumnCache(QueryableIndex index, Closer closer)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`BaseColumn`	`getColumn(String columnName)`
`ColumnHolder`	`getColumnHolder(String columnName)`
`List<String>`	`getColumnNames()`	This method is apparently no longer used anymore, so deprecating it.

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

Methods inherited from interface org.apache.druid.segment.ColumnInspector
getColumnCapabilitiesWithDefault, getType

Methods inherited from interface org.apache.druid.segment.ColumnSelector
getColumnCapabilities

Methods inherited from interface org.apache.druid.math.expr.Expr.InputBindingInspector
areNumeric, areNumeric, areSameTypes, areSameTypes, areScalar, areScalar, canVectorize, canVectorize

- Constructor Detail
  - ColumnCache
```
public ColumnCache(QueryableIndex index,
                   Closer closer)
```
- Method Detail
  - getColumnNames
```
public List<String> getColumnNames()
```
    Description copied from interface: ColumnSelector
    
    This method is apparently no longer used anymore, so deprecating it.
    
    Specified by:
    
    getColumnNames in interface ColumnSelector
  - getColumnHolder
```
@Nullable
public ColumnHolder getColumnHolder(String columnName)
```
    Specified by:
    
    getColumnHolder in interface ColumnSelector
  - getColumn
```
@Nullable
public BaseColumn getColumn(String columnName)
```