org.apache.calcite.linq4j.tree

类 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

所有已实现的接口:

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).

字段概要

字段

限定符和类型	字段和说明
static ConstantExpression	INSTANCE

从类继承的字段 org.apache.calcite.linq4j.tree.ConstantExpression

value

从类继承的字段 org.apache.calcite.linq4j.tree.AbstractNode

nodeType, type

方法概要

限定符和类型	方法和说明
boolean	equals(@Nullable Object o)
int	hashCode()

从类继承的方法 org.apache.calcite.linq4j.tree.ConstantExpression

accept, accept, evaluate

从类继承的方法 org.apache.calcite.linq4j.tree.Expression

canReduce

从类继承的方法 org.apache.calcite.linq4j.tree.AbstractNode

accept, getNodeType, getType, toString

从类继承的方法 java.lang.Object

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

字段详细资料

INSTANCE

public static final ConstantExpression INSTANCE

方法详细资料

equals

public boolean equals(@Nullable Object o)

覆盖:

equals 在类中 ConstantExpression

hashCode

public int hashCode()

覆盖:

hashCode 在类中 ConstantExpression