org.apache.flink.table.expressions

类 TypeLiteralExpression

java.lang.Object

org.apache.flink.table.expressions.TypeLiteralExpression

所有已实现的接口:

Expression, ResolvedExpression

@PublicEvolving
public final class TypeLiteralExpression
extends Object
implements ResolvedExpression

Expression that wraps DataType as a literal.

Expressing a type is primarily needed for casting operations. This expression simplifies the Expression design as it makes CallExpression the only expression that takes subexpressions.

构造器概要

构造器

构造器和说明
TypeLiteralExpression(DataType dataType)

方法概要

限定符和类型	方法和说明
<R> R	accept(ExpressionVisitor<R> visitor)
String	asSummaryString() Returns a string that summarizes this expression for printing to a console.
boolean	equals(Object o)
List<Expression>	getChildren()
DataType	getOutputDataType() Returns the data type of the computation result.
List<ResolvedExpression>	getResolvedChildren()
int	hashCode()
String	toString()

从类继承的方法 java.lang.Object

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

从接口继承的方法 org.apache.flink.table.expressions.ResolvedExpression

asSerializableString

构造器详细资料

TypeLiteralExpression

public TypeLiteralExpression(DataType dataType)

方法详细资料

getOutputDataType

public DataType getOutputDataType()

从接口复制的说明: ResolvedExpression

Returns the data type of the computation result.

指定者:

getOutputDataType 在接口中 ResolvedExpression

getResolvedChildren

public List<ResolvedExpression> getResolvedChildren()

指定者:

getResolvedChildren 在接口中 ResolvedExpression

asSummaryString

public String asSummaryString()

从接口复制的说明: Expression

Returns a string that summarizes this expression for printing to a console. An implementation might skip very specific properties.

指定者:

asSummaryString 在接口中 Expression

返回:

summary string of this expression for debugging purposes

getChildren

public List<Expression> getChildren()

指定者:

getChildren 在接口中 Expression

accept

public <R> R accept(ExpressionVisitor<R> visitor)

指定者:

accept 在接口中 Expression

equals

public boolean equals(Object o)

覆盖:

equals 在类中 Object

hashCode

public int hashCode()

覆盖:

hashCode 在类中 Object

toString

public String toString()

覆盖:

toString 在类中 Object