Package org.apache.druid.segment.virtual

Class VirtualizedColumnInspector

java.lang.Object

org.apache.druid.segment.virtual.VirtualizedColumnInspector

All Implemented Interfaces:

Expr.InputBindingInspector, ColumnInspector

Direct Known Subclasses:

VirtualizedColumnSelectorFactory

public class VirtualizedColumnInspector
extends Object
implements ColumnInspector

Provides ColumnCapabilities for both virtual and non-virtual columns by building on top of another base ColumnInspector. VirtualColumns are provided with the base inspector so that they may potentially infer output types to construct the appropriate capabilities for virtual columns, while the base inspector directly supplies the capabilities for non-virtual columns.

Field Summary

Fields

Modifier and Type	Field	Description
protected ColumnInspector	baseInspector
protected VirtualColumns	virtualColumns

Constructor Summary

Constructors

Constructor	Description
VirtualizedColumnInspector(ColumnInspector baseInspector, VirtualColumns virtualColumns)

Method Summary

Modifier and Type	Method	Description
ColumnCapabilities	getColumnCapabilities(String columnName)	Returns capabilities of a particular column.

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.math.expr.Expr.InputBindingInspector

areNumeric, areNumeric, areSameTypes, areSameTypes, areScalar, areScalar, canVectorize, canVectorize

Field Detail

virtualColumns

protected final VirtualColumns virtualColumns

baseInspector

protected final ColumnInspector baseInspector

Constructor Detail

VirtualizedColumnInspector

public VirtualizedColumnInspector(ColumnInspector baseInspector,
                                  VirtualColumns virtualColumns)

Method Detail

getColumnCapabilities

@Nullable
public ColumnCapabilities getColumnCapabilities(String columnName)

Description copied from interface: ColumnInspector

Returns capabilities of a particular column.

Specified by:

getColumnCapabilities in interface ColumnInspector

Parameters:

columnName - column name

Returns:

capabilities, or null