org.apache.druid.segment.column

Class StringUtf8DictionaryEncodedColumn.StringSingleValueDimensionVectorSelector

java.lang.Object

org.apache.druid.segment.column.StringUtf8DictionaryEncodedColumn.StringSingleValueDimensionVectorSelector

All Implemented Interfaces:

DimensionDictionarySelector, IdLookup, SingleValueDimensionVectorSelector, VectorSizeInspector

Enclosing class:

StringUtf8DictionaryEncodedColumn

public abstract static class StringUtf8DictionaryEncodedColumn.StringSingleValueDimensionVectorSelector
extends Object
implements SingleValueDimensionVectorSelector, IdLookup

Base type for a SingleValueDimensionVectorSelector for a dictionary encoded ColumnType.STRING built around a ColumnarInts. Dictionary not included - BYO dictionary lookup methods. Assumes that all implementations return true for supportsLookupNameUtf8().

Field Summary

Fields inherited from interface org.apache.druid.segment.DimensionDictionarySelector

CARDINALITY_UNKNOWN

Constructor Summary

Constructors

Constructor and Description
StringSingleValueDimensionVectorSelector(ColumnarInts column, ReadableVectorOffset offset)

Method Summary

Modifier and Type	Method and Description
int	getCurrentVectorSize() Returns the current vector size for this cursor.
int	getMaxVectorSize() Returns the maximum vector size for this cursor.
int[]	getRowVector() Get the current vector.
IdLookup	idLookup() Returns IdLookup if available for this DimensionSelector, or null.
boolean	nameLookupPossibleInAdvance() Returns true if it is possible to DimensionDictionarySelector.lookupName(int) by ids from 0 to DimensionDictionarySelector.getValueCardinality() before the rows with those ids are returned.
boolean	supportsLookupNameUtf8() Returns whether this selector supports DimensionDictionarySelector.lookupNameUtf8(int).

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.DimensionDictionarySelector

getValueCardinality, lookupName, lookupNameUtf8

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

lookupId

Constructor Detail

StringSingleValueDimensionVectorSelector

public StringSingleValueDimensionVectorSelector(ColumnarInts column,
                                                ReadableVectorOffset offset)

Method Detail

getRowVector

public int[] getRowVector()

Description copied from interface: SingleValueDimensionVectorSelector

Get the current vector. The array will be reused, so it is not a good idea to retain a reference to it.

Specified by:

getRowVector in interface SingleValueDimensionVectorSelector

supportsLookupNameUtf8

public boolean supportsLookupNameUtf8()

Description copied from interface: DimensionDictionarySelector

Returns whether this selector supports DimensionDictionarySelector.lookupNameUtf8(int).

Specified by:

supportsLookupNameUtf8 in interface DimensionDictionarySelector

nameLookupPossibleInAdvance

public boolean nameLookupPossibleInAdvance()

Description copied from interface: DimensionDictionarySelector

Returns true if it is possible to DimensionDictionarySelector.lookupName(int) by ids from 0 to DimensionDictionarySelector.getValueCardinality() before the rows with those ids are returned.

Returns false if DimensionDictionarySelector.lookupName(int) could be called with ids, returned from the most recent row (or row vector) returned by this DimensionSelector, but not earlier. If DimensionDictionarySelector.getValueCardinality() of this selector additionally returns DimensionDictionarySelector.CARDINALITY_UNKNOWN, lookupName() couldn't be called with ids, returned by not the most recent row (or row vector), i. e. names for ids couldn't be looked up "later". If DimensionDictionarySelector.getValueCardinality() returns a non-negative number, lookupName() could be called with any ids, returned from rows (or row vectors) returned since the creation of this DimensionSelector.

If DimensionDictionarySelector.lookupName(int) is called with an ineligible id, result is undefined: exception could be thrown, or null returned, or some other random value.

Specified by:

nameLookupPossibleInAdvance in interface DimensionDictionarySelector

idLookup

@Nullable
public IdLookup idLookup()

Description copied from interface: DimensionDictionarySelector

Returns IdLookup if available for this DimensionSelector, or null.

Specified by:

idLookup in interface DimensionDictionarySelector

getCurrentVectorSize

public int getCurrentVectorSize()

Description copied from interface: VectorSizeInspector

Returns the current vector size for this cursor. Will never be larger than the max size returned by VectorSizeInspector.getMaxVectorSize().

Specified by:

getCurrentVectorSize in interface VectorSizeInspector

getMaxVectorSize

public int getMaxVectorSize()

Description copied from interface: VectorSizeInspector

Returns the maximum vector size for this cursor. It will not change for the lifetime of this cursor, and is generally used to allocate scratch arrays for later processing. Will always be greater than zero.

Specified by:

getMaxVectorSize in interface VectorSizeInspector