Package 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	Description
static class	VirtualColumn.Builder	Virtual Column builder.

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	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

Constructor Details

VirtualColumn

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

Method Details

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()