org.apache.druid.segment

Class NestedDataDimensionHandler

java.lang.Object

org.apache.druid.segment.NestedDataDimensionHandler

All Implemented Interfaces:

DimensionHandler<StructuredData,StructuredData,StructuredData>

public class NestedDataDimensionHandler
extends Object
implements DimensionHandler<StructuredData,StructuredData,StructuredData>

Constructor Summary

Constructors

Constructor and Description
NestedDataDimensionHandler(String name)

Method Summary

Modifier and Type	Method and Description
String	getDimensionName() Get the name of the column associated with this handler.
DimensionSchema	getDimensionSchema(ColumnCapabilities capabilities)
DimensionSpec	getDimensionSpec() Create a DimensionSpec for this handler
Comparator<ColumnValueSelector>	getEncodedValueSelectorComparator() Returns a comparator that knows how to compare ColumnValueSelector of the assumed dimension type, corresponding to this DimensionHandler.
int	getLengthOfEncodedKeyComponent(StructuredData dimVals) Given an key component representing a single set of row value(s) for this dimension as an Object, return the length of the key component after appropriate type-casting.
DimensionIndexer<StructuredData,StructuredData,StructuredData>	makeIndexer(boolean useMaxMemoryEstimates) Creates a new DimensionIndexer, a per-dimension object responsible for processing ingested rows in-memory, used by the IncrementalIndex.
DimensionMergerV9	makeMerger(IndexSpec indexSpec, SegmentWriteOutMedium segmentWriteOutMedium, ColumnCapabilities capabilities, ProgressIndicator progress, Closer closer) Creates a new DimensionMergerV9, a per-dimension object responsible for merging indexes/row data across segments and building the on-disk representation of a dimension.
SettableColumnValueSelector	makeNewSettableEncodedValueSelector() Creates and returns a new object of some implementation of SettableColumnValueSelector, that corresponds to the type of this DimensionHandler.

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.DimensionHandler

getMultivalueHandling

Constructor Detail

NestedDataDimensionHandler

public NestedDataDimensionHandler(String name)

Method Detail

getDimensionName

public String getDimensionName()

Description copied from interface: DimensionHandler

Get the name of the column associated with this handler. This string would be the output name of the column during ingestion, and the name of an input column when querying.

Specified by:

getDimensionName in interface DimensionHandler<StructuredData,StructuredData,StructuredData>

Returns:

Dimension name

getDimensionSpec

public DimensionSpec getDimensionSpec()

Description copied from interface: DimensionHandler

Create a DimensionSpec for this handler

Specified by:

getDimensionSpec in interface DimensionHandler<StructuredData,StructuredData,StructuredData>

getDimensionSchema

public DimensionSchema getDimensionSchema(ColumnCapabilities capabilities)

Specified by:

getDimensionSchema in interface DimensionHandler<StructuredData,StructuredData,StructuredData>

makeIndexer

public DimensionIndexer<StructuredData,StructuredData,StructuredData> makeIndexer(boolean useMaxMemoryEstimates)

Description copied from interface: DimensionHandler

Creates a new DimensionIndexer, a per-dimension object responsible for processing ingested rows in-memory, used by the IncrementalIndex. See DimensionIndexer interface for more information.

Specified by:

makeIndexer in interface DimensionHandler<StructuredData,StructuredData,StructuredData>

Parameters:

useMaxMemoryEstimates - true if the created DimensionIndexer should use maximum values to estimate on-heap memory

Returns:

A new DimensionIndexer object.

makeMerger

public DimensionMergerV9 makeMerger(IndexSpec indexSpec,
                                    SegmentWriteOutMedium segmentWriteOutMedium,
                                    ColumnCapabilities capabilities,
                                    ProgressIndicator progress,
                                    Closer closer)

Description copied from interface: DimensionHandler

Creates a new DimensionMergerV9, a per-dimension object responsible for merging indexes/row data across segments and building the on-disk representation of a dimension. For use with IndexMergerV9 only. See DimensionMergerV9 interface for more information.

Specified by:

makeMerger in interface DimensionHandler<StructuredData,StructuredData,StructuredData>

Parameters:

indexSpec - Specification object for the index merge

segmentWriteOutMedium - this SegmentWriteOutMedium object could be used internally in the created merger, if needed

capabilities - The ColumnCapabilities of the dimension represented by this DimensionHandler

progress - ProgressIndicator used by the merging process

Returns:

A new DimensionMergerV9 object.

getLengthOfEncodedKeyComponent

public int getLengthOfEncodedKeyComponent(StructuredData dimVals)

Description copied from interface: DimensionHandler

Given an key component representing a single set of row value(s) for this dimension as an Object, return the length of the key component after appropriate type-casting. For example, a dictionary encoded String dimension would receive an int[] as input to this method, while a Long numeric dimension would receive a single Long object (no multivalue support)

Specified by:

getLengthOfEncodedKeyComponent in interface DimensionHandler<StructuredData,StructuredData,StructuredData>

Parameters:

dimVals - Values for this dimension from a row

Returns:

Size of dimVals

getEncodedValueSelectorComparator

public Comparator<ColumnValueSelector> getEncodedValueSelectorComparator()

Description copied from interface: DimensionHandler

Returns a comparator that knows how to compare ColumnValueSelector of the assumed dimension type, corresponding to this DimensionHandler. E. g. StringDimensionHandler returns a comparator, that compares ColumnValueSelectors as DimensionSelectors. The comparison rules used by this method should match the rules used by DimensionIndexer.compareUnsortedEncodedKeyComponents(EncodedKeyComponentType, EncodedKeyComponentType), otherwise incorrect ordering/merging of rows can occur during ingestion, causing issues such as imperfect rollup.

Specified by:

getEncodedValueSelectorComparator in interface DimensionHandler<StructuredData,StructuredData,StructuredData>

makeNewSettableEncodedValueSelector

public SettableColumnValueSelector makeNewSettableEncodedValueSelector()

Description copied from interface: DimensionHandler

Creates and returns a new object of some implementation of SettableColumnValueSelector, that corresponds to the type of this DimensionHandler. E. g. LongDimensionHandler returns SettableLongColumnValueSelector, etc.

Specified by:

makeNewSettableEncodedValueSelector in interface DimensionHandler<StructuredData,StructuredData,StructuredData>