org.apache.druid.segment.vector

Class QueryableIndexVectorColumnSelectorFactory

java.lang.Object

org.apache.druid.segment.vector.QueryableIndexVectorColumnSelectorFactory

All Implemented Interfaces:

Expr.InputBindingInspector, ColumnInspector, VectorColumnSelectorFactory

public class QueryableIndexVectorColumnSelectorFactory
extends Object
implements VectorColumnSelectorFactory

Constructor Summary

Constructors

Constructor and Description
QueryableIndexVectorColumnSelectorFactory(QueryableIndex index, ReadableVectorOffset offset, Closer closer, Map<String,BaseColumn> columnCache, VirtualColumns virtualColumns)

Method Summary

Modifier and Type	Method and Description
ColumnCapabilities	getColumnCapabilities(String columnName) Returns capabilities of a particular column, or null if the column doesn't exist.
ReadableVectorInspector	getReadableVectorInspector() Returns a ReadableVectorInspector for the VectorCursor that generated this object.
MultiValueDimensionVectorSelector	makeMultiValueDimensionSelector(DimensionSpec dimensionSpec) Returns a dictionary encoded, string-typed, multi-value-per-row column selector.
VectorObjectSelector	makeObjectSelector(String columnName) Returns an object selector.
SingleValueDimensionVectorSelector	makeSingleValueDimensionSelector(DimensionSpec dimensionSpec) Returns a dictionary encoded, string-typed, single-value-per-row column selector.
VectorValueSelector	makeValueSelector(String columnName) Returns a primitive column selector.

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.vector.VectorColumnSelectorFactory

getMaxVectorSize

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

getType

Methods inherited from interface org.apache.druid.math.expr.Expr.InputBindingInspector

areNumeric, areNumeric, areScalar, areScalar, canVectorize, canVectorize

Constructor Detail

QueryableIndexVectorColumnSelectorFactory

public QueryableIndexVectorColumnSelectorFactory(QueryableIndex index,
                                                 ReadableVectorOffset offset,
                                                 Closer closer,
                                                 Map<String,BaseColumn> columnCache,
                                                 VirtualColumns virtualColumns)

Method Detail

getReadableVectorInspector

public ReadableVectorInspector getReadableVectorInspector()

Description copied from interface: VectorColumnSelectorFactory

Returns a ReadableVectorInspector for the VectorCursor that generated this object.

Specified by:

getReadableVectorInspector in interface VectorColumnSelectorFactory

makeMultiValueDimensionSelector

public MultiValueDimensionVectorSelector makeMultiValueDimensionSelector(DimensionSpec dimensionSpec)

Description copied from interface: VectorColumnSelectorFactory

Returns a dictionary encoded, string-typed, multi-value-per-row column selector. Should only be called on columns where VectorColumnSelectorFactory.getColumnCapabilities(java.lang.String) indicates they return STRING. Unlike VectorColumnSelectorFactory.makeSingleValueDimensionSelector(org.apache.druid.query.dimension.DimensionSpec), this should not be called on nonexistent columns. If you need to write code that adapts to different input types, you should write a VectorColumnProcessorFactory and use one of the ColumnProcessors.makeVectorProcessor(java.lang.String, org.apache.druid.segment.VectorColumnProcessorFactory<T>, org.apache.druid.segment.vector.VectorColumnSelectorFactory) functions instead of using this method.

Specified by:

makeMultiValueDimensionSelector in interface VectorColumnSelectorFactory

makeSingleValueDimensionSelector

public SingleValueDimensionVectorSelector makeSingleValueDimensionSelector(DimensionSpec dimensionSpec)

Description copied from interface: VectorColumnSelectorFactory

Returns a dictionary encoded, string-typed, single-value-per-row column selector. Should only be called on columns where VectorColumnSelectorFactory.getColumnCapabilities(java.lang.String) indicates they return STRING, or on nonexistent columns. Since the selector created with this method operates directly on the dictionary encoded input, STRING values must be translated from the dictionary id for a given row value using DimensionDictionarySelector.lookupName(int), but this selector can prove optimal for operations which can be done directly on the underlying dictionary ids, such as grouping within a segment. If you need to write code that adapts to different input types, you should write a VectorColumnProcessorFactory and use one of the ColumnProcessors.makeVectorProcessor(java.lang.String, org.apache.druid.segment.VectorColumnProcessorFactory<T>, org.apache.druid.segment.vector.VectorColumnSelectorFactory) functions instead of using this method.

Specified by:

makeSingleValueDimensionSelector in interface VectorColumnSelectorFactory

makeValueSelector

public VectorValueSelector makeValueSelector(String columnName)

Description copied from interface: VectorColumnSelectorFactory

Returns a primitive column selector. Should only be called on columns where VectorColumnSelectorFactory.getColumnCapabilities(java.lang.String) indicates they return DOUBLE, FLOAT, or LONG, or on nonexistent columns. If you need to write code that adapts to different input types, you should write a VectorColumnProcessorFactory and use one of the ColumnProcessors.makeVectorProcessor(java.lang.String, org.apache.druid.segment.VectorColumnProcessorFactory<T>, org.apache.druid.segment.vector.VectorColumnSelectorFactory) functions instead of using this method.

Specified by:

makeValueSelector in interface VectorColumnSelectorFactory

makeObjectSelector

public VectorObjectSelector makeObjectSelector(String columnName)

Description copied from interface: VectorColumnSelectorFactory

Returns an object selector. Should only be called on columns where VectorColumnSelectorFactory.getColumnCapabilities(java.lang.String) indicates that they return STRING or COMPLEX, or on nonexistent columns. For STRING, this is needed if values are not dictionary encoded, such as computed virtual columns, or can optionally be used in place of SingleValueDimensionVectorSelector when using the dictionary isn't helpful. Currently, this should only be called on single valued STRING inputs (multi-value STRING vector object selector is not yet implemented). If you need to write code that adapts to different input types, you should write a VectorColumnProcessorFactory and use one of the ColumnProcessors.makeVectorProcessor(java.lang.String, org.apache.druid.segment.VectorColumnProcessorFactory<T>, org.apache.druid.segment.vector.VectorColumnSelectorFactory) functions instead of using this method.

Specified by:

makeObjectSelector in interface VectorColumnSelectorFactory

getColumnCapabilities

@Nullable
public ColumnCapabilities getColumnCapabilities(String columnName)

Description copied from interface: VectorColumnSelectorFactory

Returns capabilities of a particular column, or null if the column doesn't exist. Unlike ColumnSelectorFactory, null does not potentially indicate a dynamically discovered column.

Specified by:

getColumnCapabilities in interface ColumnInspector

Specified by:

getColumnCapabilities in interface VectorColumnSelectorFactory

Parameters:

columnName - column name

Returns:

capabilities, or null if the column doesn't exist.