Package org.apache.druid.segment.nested

Class NestedDataComplexColumn

java.lang.Object

org.apache.druid.segment.nested.NestedDataComplexColumn

All Implemented Interfaces:

Closeable, AutoCloseable, BaseColumn, ComplexColumn, SelectableColumn, NestedColumnIndexSupplier, NestedColumnSelectorFactory, NestedColumnTypeInspector, NestedVectorColumnSelectorFactory

Direct Known Subclasses:

CompressedNestedDataComplexColumn

public abstract class NestedDataComplexColumn
extends Object
implements ComplexColumn, NestedColumnTypeInspector, NestedColumnIndexSupplier, NestedColumnSelectorFactory, NestedVectorColumnSelectorFactory

Describes the basic shape for any 'nested data' (StructuredData) ComplexColumn implementation along with basic facilities for caching any columns created and methods for retrieving selectors for nested field columns.

NestedFieldVirtualColumn allows query time use of the nested fields.

Constructor Summary

Constructors

Constructor	Description
NestedDataComplexColumn()

Method Summary

Modifier and Type	Method	Description
<T> T	as(Class<T> clazz)	Request an implementation of a particular interface.
Class<?>	getClazz()
abstract ColumnHolder	getColumnHolder(List<NestedPathPart> path)	Get a ColumnHolder for a nested field column to retrieve metadata, the column itself, or indexes.
String	getTypeName()

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.column.BaseColumn

makeVectorValueSelector

Methods inherited from interface org.apache.druid.segment.column.ComplexColumn

close, getLength, getRowValue, makeColumnValueSelector, makeVectorObjectSelector

Methods inherited from interface org.apache.druid.segment.nested.NestedColumnIndexSupplier

getColumnIndexSupplier

Methods inherited from interface org.apache.druid.segment.nested.NestedColumnSelectorFactory

makeColumnValueSelector, makeDimensionSelector

Methods inherited from interface org.apache.druid.segment.nested.NestedColumnTypeInspector

getFieldLogicalType, getFieldTypes, getNestedFields, isNumeric

Methods inherited from interface org.apache.druid.segment.nested.NestedVectorColumnSelectorFactory

makeSingleValueDimensionVectorSelector, makeVectorObjectSelector, makeVectorValueSelector

Constructor Details

NestedDataComplexColumn

public NestedDataComplexColumn()

Method Details

getColumnHolder

@Nullable
public abstract ColumnHolder getColumnHolder(List<NestedPathPart> path)

Get a ColumnHolder for a nested field column to retrieve metadata, the column itself, or indexes.

getClazz

public Class<?> getClazz()

Specified by:

getClazz in interface ComplexColumn

Returns:

Class of objects returned on calls to ComplexColumn.getRowValue(int) .

getTypeName

public String getTypeName()

Specified by:

getTypeName in interface ComplexColumn

Returns:

Typename associated with this column.

as

@Nullable
public <T> T as(Class<T> clazz)

Description copied from interface: SelectableColumn

Request an implementation of a particular interface. Physical nested columns, and virtual columns that act as a nested column, should implement:

• NestedColumnTypeInspector, required.
• NestedColumnSelectorFactory, required.
• NestedVectorColumnSelectorFactory, required.
• NestedColumnIndexSupplier, if the column has indexes.

Specified by:

as in interface SelectableColumn

Type Parameters:

T - desired interface

Parameters:

clazz - desired interface

Returns:

instance of clazz, or null if the interface is not supported by this segment