org.apache.calcite.adapter.druid

Class VirtualColumn

java.lang.Object

org.apache.calcite.adapter.druid.VirtualColumn

All Implemented Interfaces:

DruidJson

public class VirtualColumn
extends Object
implements DruidJson

Druid Json Expression based Virtual Column. Virtual columns is used as "projection" concept throughout Druid using expression.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	VirtualColumn.Builder Virtual Column Builder

Field Summary

Fields

Modifier and Type	Field and Description
private String	expression
private String	name
private DruidType	outputType

Constructor Summary

Constructors

Constructor and Description
VirtualColumn(String name, String expression, DruidType outputType)

Method Summary

Modifier and Type	Method and Description
static VirtualColumn.Builder	builder()
String	getExpression()
String	getName()
DruidType	getOutputType()
void	write(com.fasterxml.jackson.core.JsonGenerator generator)

Methods inherited from class java.lang.Object

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

Field Detail

name

private final String name

expression

private final String expression

outputType

private final DruidType outputType

Constructor Detail

VirtualColumn

public VirtualColumn(String name,
                     String expression,
                     DruidType outputType)

Method Detail

write

public void write(com.fasterxml.jackson.core.JsonGenerator generator)
           throws IOException

Specified by:

write in interface DruidJson

Throws:

IOException

getName

public String getName()

getExpression

public String getExpression()

getOutputType

public DruidType getOutputType()

builder

public static VirtualColumn.Builder builder()