Package org.apache.calcite.runtime.variant

Class VariantNull

java.lang.Object

org.apache.calcite.runtime.variant.VariantValue

org.apache.calcite.runtime.variant.VariantNull

public class VariantNull
extends VariantValue

The VARIANT type has its own notion of null, which is different from the SQL NULL value. For example, two variant nulls are equal with each other. This class represents such values.

Field Summary

Fields

Modifier and Type	Field	Description
static final VariantNull	INSTANCE

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	VariantNull()

Method Summary

Modifier and Type	Method	Description
@Nullable Object	cast(RuntimeTypeInformation type)	Cast this value to the specified type.
boolean	equals(@Nullable Object other)
static VariantNull	getInstance()	Get the single instance of this type.
String	getTypeString()	A string describing the runtime type information of this value.
int	hashCode()
@Nullable Object	item(Object index)
String	toString()

Methods inherited from class org.apache.calcite.runtime.variant.VariantValue

getTypeString

Methods inherited from class java.lang.Object

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

Field Details

INSTANCE

public static final VariantNull INSTANCE

Constructor Details

VariantNull

protected VariantNull()

Method Details

getTypeString

public String getTypeString()

Description copied from class: VariantValue

A string describing the runtime type information of this value.

Specified by:

getTypeString in class VariantValue

cast

public @Nullable Object cast(RuntimeTypeInformation type)

Description copied from class: VariantValue

Cast this value to the specified type. Currently, the rule is: if the value has the specified type, the value field is returned, otherwise a SQL NULL is returned.

Specified by:

cast in class VariantValue

item

public @Nullable Object item(Object index)

Specified by:

item in class VariantValue

getInstance

public static VariantNull getInstance()

Get the single instance of this type.

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(@Nullable Object other)

Overrides:

equals in class Object

toString

public String toString()

Overrides:

toString in class Object