Package org.apache.druid.segment.virtual

Class NestedMergeVirtualColumn

java.lang.Object

org.apache.druid.segment.virtual.SpecializedExpressionVirtualColumn

org.apache.druid.segment.virtual.NestedMergeVirtualColumn

All Implemented Interfaces:

Cacheable, VirtualColumn

public class NestedMergeVirtualColumn
extends SpecializedExpressionVirtualColumn

Specialized virtual column for NestedDataExpressions.JsonMergeExprMacro.

Nested Class Summary

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
NestedMergeVirtualColumn(String name, List<String> columns, ExprMacroTable macroTable)

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object o)
List<String>	getColumns()
int	hashCode()
VirtualColumn	rewriteRequiredColumns(Map<String,String> columnRewrites)	Return a copy of this virtual column that is identical to this virtual column except that it operates on different columns, based on a renaming map where the key is the column to be renamed and the value is the new column.
boolean	supportsRequiredRewrite()	Returns true if the virtual column supports VirtualColumn.rewriteRequiredColumns(Map)
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, getCacheKey, getEquivalanceKey, getIndexSupplier, getOutputName, 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

NestedMergeVirtualColumn

public NestedMergeVirtualColumn(String name,
 List<String> columns,
 ExprMacroTable macroTable)

Method Details

getColumns

public List<String> getColumns()

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.

supportsRequiredRewrite

public boolean supportsRequiredRewrite()

Description copied from interface: VirtualColumn

Returns true if the virtual column supports VirtualColumn.rewriteRequiredColumns(Map)

rewriteRequiredColumns

public VirtualColumn rewriteRequiredColumns(Map<String,String> columnRewrites)

Description copied from interface: VirtualColumn

Return a copy of this virtual column that is identical to this virtual column except that it operates on different columns, based on a renaming map where the key is the column to be renamed and the value is the new column. Callers should check VirtualColumn.supportsRequiredRewrite() first to ensure that this method is supported.

Parameters:

columnRewrites - Column rewrite map

Returns:

Copy of this virtual column that operates on new columns based on the rewrite map

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object o)

Overrides:

equals in class SpecializedExpressionVirtualColumn

hashCode

public int hashCode()

Overrides:

hashCode in class SpecializedExpressionVirtualColumn