org.apache.druid.segment.column

Class StringFrontCodedDictionaryEncodedColumn

java.lang.Object

org.apache.druid.segment.column.StringFrontCodedDictionaryEncodedColumn

All Implemented Interfaces:

Closeable, AutoCloseable, BaseColumn, DictionaryEncodedColumn<String>

public class StringFrontCodedDictionaryEncodedColumn
extends Object
implements DictionaryEncodedColumn<String>

DictionaryEncodedColumn for a column which uses a FrontCodedIndexed to store its value dictionary, which 'delta encodes' strings (instead of GenericIndexed like StringDictionaryEncodedColumn). This class is otherwise nearly identical to StringDictionaryEncodedColumn other than the dictionary difference.

Constructor Summary

Constructors

Constructor and Description
StringFrontCodedDictionaryEncodedColumn(ColumnarInts singleValueColumn, ColumnarMultiInts multiValueColumn, FrontCodedIndexed utf8Dictionary)

Method Summary

Modifier and Type	Method and Description
void	close()
int	getCardinality()
IndexedInts	getMultiValueRow(int rowNum)
int	getSingleValueRow(int rowNum)
boolean	hasMultipleValues()
int	length()
int	lookupId(String name)
String	lookupName(int id)
HistoricalDimensionSelector	makeDimensionSelector(ReadableOffset offset, ExtractionFn extractionFn)
MultiValueDimensionVectorSelector	makeMultiValueDimensionVectorSelector(ReadableVectorOffset offset)
SingleValueDimensionVectorSelector	makeSingleValueDimensionVectorSelector(ReadableVectorOffset offset)
VectorObjectSelector	makeVectorObjectSelector(ReadableVectorOffset offset)

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.DictionaryEncodedColumn

makeColumnValueSelector

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

makeVectorValueSelector

Constructor Detail

StringFrontCodedDictionaryEncodedColumn

public StringFrontCodedDictionaryEncodedColumn(@Nullable
                                               ColumnarInts singleValueColumn,
                                               @Nullable
                                               ColumnarMultiInts multiValueColumn,
                                               FrontCodedIndexed utf8Dictionary)

Method Detail

length

public int length()

Specified by:

length in interface DictionaryEncodedColumn<String>

hasMultipleValues

public boolean hasMultipleValues()

Specified by:

hasMultipleValues in interface DictionaryEncodedColumn<String>

getSingleValueRow

public int getSingleValueRow(int rowNum)

Specified by:

getSingleValueRow in interface DictionaryEncodedColumn<String>

getMultiValueRow

public IndexedInts getMultiValueRow(int rowNum)

Specified by:

getMultiValueRow in interface DictionaryEncodedColumn<String>

lookupName

@Nullable
public String lookupName(int id)

Specified by:

lookupName in interface DictionaryEncodedColumn<String>

lookupId

public int lookupId(String name)

Specified by:

lookupId in interface DictionaryEncodedColumn<String>

getCardinality

public int getCardinality()

Specified by:

getCardinality in interface DictionaryEncodedColumn<String>

makeDimensionSelector

public HistoricalDimensionSelector makeDimensionSelector(ReadableOffset offset,
                                                         @Nullable
                                                         ExtractionFn extractionFn)

Specified by:

makeDimensionSelector in interface DictionaryEncodedColumn<String>

makeSingleValueDimensionVectorSelector

public SingleValueDimensionVectorSelector makeSingleValueDimensionVectorSelector(ReadableVectorOffset offset)

Specified by:

makeSingleValueDimensionVectorSelector in interface DictionaryEncodedColumn<String>

makeMultiValueDimensionVectorSelector

public MultiValueDimensionVectorSelector makeMultiValueDimensionVectorSelector(ReadableVectorOffset offset)

Specified by:

makeMultiValueDimensionVectorSelector in interface DictionaryEncodedColumn<String>

makeVectorObjectSelector

public VectorObjectSelector makeVectorObjectSelector(ReadableVectorOffset offset)

Specified by:

makeVectorObjectSelector in interface BaseColumn

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Throws:

IOException