ColumnIndexSelector (druid-processing 28.0.0 API)

All Superinterfaces:

ColumnInspector, Expr.InputBindingInspector

All Known Implementing Classes:

ColumnSelectorColumnIndexSelector
```
public interface ColumnIndexSelector
extends ColumnInspector
```

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`BitmapFactory`	`getBitmapFactory()`
`ColumnIndexSupplier`	`getIndexSupplier(String column)`	Get the `ColumnIndexSupplier` of a column.
`int`	`getNumRows()`

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

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

- Method Detail
  - getNumRows
```
int getNumRows()
```
  - getBitmapFactory
```
BitmapFactory getBitmapFactory()
```
  - getIndexSupplier
```
@Nullable
ColumnIndexSupplier getIndexSupplier(String column)
```
    Get the ColumnIndexSupplier of a column. If the column exists, but does not support indexes, this method will return a non-null index supplier, likely NoIndexesColumnIndexSupplier. Columns which are 'missing' will return a null value from this method, which allows for filters to act on this information to produce an all true or all false index depending on how the filter matches the null value.