org.apache.druid.sql.calcite.rel

Class VirtualColumnRegistry

java.lang.Object

org.apache.druid.sql.calcite.rel.VirtualColumnRegistry

public class VirtualColumnRegistry
extends Object

Provides facilities to create and re-use VirtualColumn definitions for dimensions, filters, and filtered aggregators while constructing a DruidQuery.

Method Summary

Modifier and Type	Method and Description
static VirtualColumnRegistry	create(RowSignature rowSignature)
RowSignature	getFullRowSignature() Get a signature representing the base signature plus all registered virtual columns.
VirtualColumn	getOrCreateVirtualColumnForExpression(PlannerContext plannerContext, DruidExpression expression, org.apache.calcite.sql.type.SqlTypeName typeName) Get existing or create new VirtualColumn for a given DruidExpression.
VirtualColumn	getVirtualColumn(String virtualColumnName) Get existing virtual column by column name
boolean	isVirtualColumnDefined(String virtualColumnName) Check if a VirtualColumn is defined by column name

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

create

public static VirtualColumnRegistry create(RowSignature rowSignature)

isVirtualColumnDefined

public boolean isVirtualColumnDefined(String virtualColumnName)

Check if a VirtualColumn is defined by column name

getOrCreateVirtualColumnForExpression

public VirtualColumn getOrCreateVirtualColumnForExpression(PlannerContext plannerContext,
                                                           DruidExpression expression,
                                                           org.apache.calcite.sql.type.SqlTypeName typeName)

Get existing or create new VirtualColumn for a given DruidExpression.

getVirtualColumn

@Nullable
public VirtualColumn getVirtualColumn(String virtualColumnName)

Get existing virtual column by column name

getFullRowSignature

public RowSignature getFullRowSignature()

Get a signature representing the base signature plus all registered virtual columns.