Package org.apache.calcite.linq4j.tree

Class ConstantUntypedNull

java.lang.Object

org.apache.calcite.linq4j.tree.AbstractNode

org.apache.calcite.linq4j.tree.Expression

org.apache.calcite.linq4j.tree.ConstantExpression

org.apache.calcite.linq4j.tree.ConstantUntypedNull

All Implemented Interfaces:

Node

public class ConstantUntypedNull
extends ConstantExpression

Represents a constant null of unknown type Java allows type inference for such nulls, thus "null" cannot always be replaced to (Object)null and vise versa.

ConstantExpression(null, Object.class) is not equal to ConstantUntypedNull However, optimizers might treat all the nulls equal (e.g. in case of comparison).

Field Summary

Fields

Modifier and Type	Field	Description
static final ConstantExpression	INSTANCE

Fields inherited from class org.apache.calcite.linq4j.tree.ConstantExpression

value

Fields inherited from class org.apache.calcite.linq4j.tree.AbstractNode

nodeType, type

Method Summary

Modifier and Type	Method	Description
boolean	equals(@Nullable Object o)
int	hashCode()

Methods inherited from class org.apache.calcite.linq4j.tree.ConstantExpression

accept, accept, evaluate

Methods inherited from class org.apache.calcite.linq4j.tree.Expression

canReduce

Methods inherited from class org.apache.calcite.linq4j.tree.AbstractNode

accept, getNodeType, getType, toString

Methods inherited from class java.lang.Object

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

Field Details

INSTANCE

public static final ConstantExpression INSTANCE

Method Details

equals

public boolean equals(@Nullable Object o)

Overrides:

equals in class ConstantExpression

hashCode

public int hashCode()

Overrides:

hashCode in class ConstantExpression