ColumnInspector (druid-processing 30.0.1 API)

All Superinterfaces:

Expr.InputBindingInspector

All Known Subinterfaces:

ColumnIndexSelector, ColumnSelector, ColumnSelectorFactory, QueryableIndex, StorageAdapter, VectorColumnSelectorFactory

All Known Implementing Classes:

AllNullColumnSelectorFactory, ColumnCache, ColumnSelectorColumnIndexSelector, DefaultColumnSelectorFactoryMaker.ColumnAccessorBasedColumnSelectorFactory, DeprecatedQueryableIndexColumnSelector, FilteredStorageAdapter, FrameColumnSelectorFactory, FrameQueryableIndex, FrameStorageAdapter, HashJoinSegmentStorageAdapter, IncrementalIndex, IncrementalIndexStorageAdapter, IndexedTableColumnSelectorFactory, LookupColumnSelectorFactory, MultiColumnSelectorFactory, OnheapIncrementalIndex, QueryableIndexColumnSelectorFactory, QueryableIndexStorageAdapter, QueryableIndexVectorColumnSelectorFactory, RowBasedColumnSelectorFactory, RowBasedStorageAdapter, RowSignature, SettableCursorColumnSelectorFactory, SimpleQueryableIndex, UnnestStorageAdapter, VirtualizedColumnInspector, VirtualizedColumnSelectorFactory
```
public interface ColumnInspector
extends Expr.InputBindingInspector
```

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`ColumnCapabilities`	`getColumnCapabilities(String column)`	Returns capabilities of a particular column.
`default ExpressionType`	`getType(String name)`	Get the `ExpressionType` from the backing store for a given identifier (this is likely a column, but could be other things depending on the backing adapter)

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

- Method Detail
  - getColumnCapabilities
```
@Nullable
ColumnCapabilities getColumnCapabilities(String column)
```
    Returns capabilities of a particular column.
    
    Parameters:
    
    column - column name
    
    Returns:
    
    capabilities, or null
  - getType
```
@Nullable
default ExpressionType getType(String name)
```
    Description copied from interface: Expr.InputBindingInspector
    
    Get the ExpressionType from the backing store for a given identifier (this is likely a column, but could be other things depending on the backing adapter)
    
    Specified by:
    
    getType in interface Expr.InputBindingInspector