org.apache.druid.segment.join.filter

Class AllNullColumnSelectorFactory

java.lang.Object

org.apache.druid.segment.join.filter.AllNullColumnSelectorFactory

All Implemented Interfaces:

ColumnInspector, ColumnSelectorFactory

public class AllNullColumnSelectorFactory
extends Object
implements ColumnSelectorFactory

Constructor Summary

Constructors

Constructor and Description
AllNullColumnSelectorFactory()

Method Summary

Modifier and Type	Method and Description
ColumnCapabilities	getColumnCapabilities(String columnName) Returns capabilities of a particular column, if known.
ColumnValueSelector<?>	makeColumnValueSelector(String columnName) Returns ColumnValueSelector corresponding to the given column name, or NilColumnValueSelector if the column with such name is absent.
DimensionSelector	makeDimensionSelector(DimensionSpec dimensionSpec)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AllNullColumnSelectorFactory

public AllNullColumnSelectorFactory()

Method Detail

makeDimensionSelector

public DimensionSelector makeDimensionSelector(DimensionSpec dimensionSpec)

Specified by:

makeDimensionSelector in interface ColumnSelectorFactory

makeColumnValueSelector

public ColumnValueSelector<?> makeColumnValueSelector(String columnName)

Description copied from interface: ColumnSelectorFactory

Returns ColumnValueSelector corresponding to the given column name, or NilColumnValueSelector if the column with such name is absent.

Specified by:

makeColumnValueSelector in interface ColumnSelectorFactory

getColumnCapabilities

public ColumnCapabilities getColumnCapabilities(String columnName)

Description copied from interface: ColumnSelectorFactory

Returns capabilities of a particular column, if known. May be null if the column doesn't exist, or if the column does exist but the capabilities are unknown. The latter is possible with dynamically discovered columns.

Specified by:

getColumnCapabilities in interface ColumnInspector

Specified by:

getColumnCapabilities in interface ColumnSelectorFactory

Parameters:

columnName - column name

Returns:

capabilities, or null