ColumnSelector (druid-processing 30.0.1 API)

All Superinterfaces:

ColumnInspector, Expr.InputBindingInspector

All Known Subinterfaces:

ColumnIndexSelector

All Known Implementing Classes:

ColumnCache, ColumnSelectorColumnIndexSelector, DeprecatedQueryableIndexColumnSelector
```
public interface ColumnSelector
extends ColumnInspector
```

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`default ColumnCapabilities`	`getColumnCapabilities(String column)`	Returns capabilities of a particular column.
`ColumnHolder`	`getColumnHolder(String columnName)`

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

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

- Method Detail
  - getColumnHolder
```
@Nullable
ColumnHolder getColumnHolder(String columnName)
```
  - getColumnCapabilities
```
@Nullable
default ColumnCapabilities getColumnCapabilities(String column)
```
    Description copied from interface: ColumnInspector
    
    Returns capabilities of a particular column.
    
    Specified by:
    
    getColumnCapabilities in interface ColumnInspector
    
    Parameters:
    
    column - column name
    
    Returns:
    
    capabilities, or null