org.apache.druid.segment

Class QueryableIndexColumnSelectorFactory

java.lang.Object

org.apache.druid.segment.QueryableIndexColumnSelectorFactory

All Implemented Interfaces:

Expr.InputBindingInspector, ColumnInspector, ColumnSelectorFactory

public class QueryableIndexColumnSelectorFactory
extends Object
implements ColumnSelectorFactory

The basic implementation of ColumnSelectorFactory over a historical segment (i. e. QueryableIndex). It's counterpart for incremental index is IncrementalIndexColumnSelectorFactory.

Field Summary

Fields

Modifier and Type	Field and Description
protected ReadableOffset	offset

Constructor Summary

Constructors

Constructor and Description
QueryableIndexColumnSelectorFactory(QueryableIndex index, VirtualColumns virtualColumns, boolean descending, Closer closer, ReadableOffset offset, Map<String,BaseColumn> columnCache)

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

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

getType

Methods inherited from interface org.apache.druid.math.expr.Expr.InputBindingInspector

areNumeric, areNumeric, areScalar, areScalar, canVectorize, canVectorize

Field Detail

offset

protected final ReadableOffset offset

Constructor Detail

QueryableIndexColumnSelectorFactory

public QueryableIndexColumnSelectorFactory(QueryableIndex index,
                                           VirtualColumns virtualColumns,
                                           boolean descending,
                                           Closer closer,
                                           ReadableOffset offset,
                                           Map<String,BaseColumn> columnCache)

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

@Nullable
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