org.apache.druid.segment.nested

Class NestedDataComplexColumn

java.lang.Object

org.apache.druid.segment.nested.NestedDataComplexColumn

All Implemented Interfaces:

Closeable, AutoCloseable, BaseColumn, ComplexColumn

Direct Known Subclasses:

CompressedNestedDataComplexColumn

public abstract class NestedDataComplexColumn
extends Object
implements ComplexColumn

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 and Description
NestedDataComplexColumn()

Method Summary

Modifier and Type	Method and Description
Class<?>	getClazz()
abstract ColumnHolder	getColumnHolder(List<NestedPathPart> path) Get a ColumnHolder for a nested field column to retrieve metadata, the column itself, or indexes.
abstract ColumnIndexSupplier	getColumnIndexSupplier(List<NestedPathPart> path) Make a ColumnIndexSupplier for a nested field column
abstract Set<ColumnType>	getColumnTypes(List<NestedPathPart> path) Get all ColumnType for the nested field column
abstract List<List<NestedPathPart>>	getNestedFields() Get list of fields represented as a sequence of NestedPathPart
String	getTypeName()
abstract boolean	isNumeric(List<NestedPathPart> path) Shortcut to check if a nested field column is TypeSignature.isNumeric(), useful when broadly choosing the type of vector selector to be used when dealing with the path
abstract ColumnValueSelector<?>	makeColumnValueSelector(List<NestedPathPart> path, ReadableOffset readableOffset) Make a ColumnValueSelector for a nested field column
abstract DimensionSelector	makeDimensionSelector(List<NestedPathPart> path, ReadableOffset readableOffset, ExtractionFn fn) Make a DimensionSelector for a nested field column
abstract SingleValueDimensionVectorSelector	makeSingleValueDimensionVectorSelector(List<NestedPathPart> path, ReadableVectorOffset readableOffset) Make a SingleValueDimensionVectorSelector for a nested field column
abstract VectorObjectSelector	makeVectorObjectSelector(List<NestedPathPart> path, ReadableVectorOffset readableOffset) Make a VectorObjectSelector for a nested field column
abstract VectorValueSelector	makeVectorValueSelector(List<NestedPathPart> path, ReadableVectorOffset readableOffset) Make a VectorValueSelector for a nested field 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.column.ComplexColumn

close, getLength, getRowValue, makeColumnValueSelector, makeVectorObjectSelector

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

makeVectorValueSelector

Constructor Detail

NestedDataComplexColumn

public NestedDataComplexColumn()

Method Detail

makeDimensionSelector

public abstract DimensionSelector makeDimensionSelector(List<NestedPathPart> path,
                                                        ReadableOffset readableOffset,
                                                        ExtractionFn fn)

Make a DimensionSelector for a nested field column

makeColumnValueSelector

public abstract ColumnValueSelector<?> makeColumnValueSelector(List<NestedPathPart> path,
                                                               ReadableOffset readableOffset)

Make a ColumnValueSelector for a nested field column

makeSingleValueDimensionVectorSelector

public abstract SingleValueDimensionVectorSelector makeSingleValueDimensionVectorSelector(List<NestedPathPart> path,
                                                                                          ReadableVectorOffset readableOffset)

Make a SingleValueDimensionVectorSelector for a nested field column

makeVectorObjectSelector

public abstract VectorObjectSelector makeVectorObjectSelector(List<NestedPathPart> path,
                                                              ReadableVectorOffset readableOffset)

Make a VectorObjectSelector for a nested field column

makeVectorValueSelector

public abstract VectorValueSelector makeVectorValueSelector(List<NestedPathPart> path,
                                                            ReadableVectorOffset readableOffset)

Make a VectorValueSelector for a nested field column

getNestedFields

public abstract List<List<NestedPathPart>> getNestedFields()

Get list of fields represented as a sequence of NestedPathPart

getColumnTypes

@Nullable
public abstract Set<ColumnType> getColumnTypes(List<NestedPathPart> path)

Get all ColumnType for the nested field column

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.

getColumnIndexSupplier

@Nullable
public abstract ColumnIndexSupplier getColumnIndexSupplier(List<NestedPathPart> path)

Make a ColumnIndexSupplier for a nested field column

isNumeric

public abstract boolean isNumeric(List<NestedPathPart> path)

Shortcut to check if a nested field column is TypeSignature.isNumeric(), useful when broadly choosing the type of vector selector to be used when dealing with the path

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.