Package org.apache.druid.segment.virtual

Class NestedObjectVirtualColumn

java.lang.Object

org.apache.druid.segment.virtual.SpecializedExpressionVirtualColumn

org.apache.druid.segment.virtual.NestedObjectVirtualColumn

All Implemented Interfaces:

Cacheable, VirtualColumn

public class NestedObjectVirtualColumn
extends SpecializedExpressionVirtualColumn

Specialized virtual column for NestedDataExpressions.JsonObjectExprMacro.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	NestedObjectVirtualColumn.TypedExpression	Represents an expression and a target type.

Nested classes/interfaces inherited from interface org.apache.druid.segment.VirtualColumn

VirtualColumn.EquivalenceKey

Field Summary

Fields inherited from class org.apache.druid.segment.virtual.SpecializedExpressionVirtualColumn

delegate

Constructor Summary

Constructors

Constructor	Description
NestedObjectVirtualColumn(String name, Map<String,NestedObjectVirtualColumn.TypedExpression> keyExprMap, ExprMacroTable macroTable)

Method Summary

Modifier and Type	Method	Description
Map<String,NestedObjectVirtualColumn.TypedExpression>	getKeyExprMap()
SelectableColumn	toSelectableColumn(ColumnIndexSelector columnSelector)	Produces a SelectableColumn from this virtual column.
String	toString()

Methods inherited from class org.apache.druid.segment.virtual.SpecializedExpressionVirtualColumn

canVectorize, capabilities, capabilities, equals, getCacheKey, getEquivalanceKey, getIndexSupplier, getOutputName, hashCode, makeColumnValueSelector, makeDimensionSelector, makeGroupByVectorColumnSelector, makeMultiValueVectorDimensionSelector, makeSingleValueVectorDimensionSelector, makeVectorObjectSelector, makeVectorValueSelector, requiredColumns, usesDotNotation

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

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

makeColumnValueSelector, makeColumnValueSelector, makeDimensionSelector, makeDimensionSelector, makeMultiValueVectorDimensionSelector, makeMultiValueVectorDimensionSelector, makeSingleValueVectorDimensionSelector, makeSingleValueVectorDimensionSelector, makeVectorObjectSelector, makeVectorObjectSelector, makeVectorValueSelector, makeVectorValueSelector

Constructor Details

NestedObjectVirtualColumn

public NestedObjectVirtualColumn(String name,
 Map<String,NestedObjectVirtualColumn.TypedExpression> keyExprMap,
 ExprMacroTable macroTable)

Method Details

getKeyExprMap

public Map<String,NestedObjectVirtualColumn.TypedExpression> getKeyExprMap()

toSelectableColumn

public SelectableColumn toSelectableColumn(ColumnIndexSelector columnSelector)

Description copied from interface: VirtualColumn

Produces a SelectableColumn from this virtual column. This allows the virtual column to offer specialized interfaces, such as NestedColumnTypeInspector or NestedColumnSelectorFactory. These interfaces may be used by query objects, including other virtual columns, to perform queries in a more efficient manner.

Specified by:

toSelectableColumn in interface VirtualColumn

Overrides:

toSelectableColumn in class SpecializedExpressionVirtualColumn

Parameters:

columnSelector - selector for underlying columns and indexes. Cannot be used during execution of this method, but can be stored for later usage.

toString

public String toString()

Overrides:

toString in class Object