org.apache.flink.table.expressions

接口 ResolvedExpression

所有超级接口:

Expression

所有已知实现类:

AggregateExpression, CallExpression, FieldReferenceExpression, TypeLiteralExpression, ValueLiteralExpression

@PublicEvolving
public interface ResolvedExpression
extends Expression

Expression that has been fully resolved and validated.

Compared to Expression, resolved expressions do not contain unresolved subexpressions anymore and provide an output data type for the computation result.

Instances of this class describe a fully parameterized, immutable expression that can be serialized and persisted.

Resolved expression are the output of the API to the planner and are pushed from the planner into interfaces, for example, for predicate push-down.

方法概要

限定符和类型	方法和说明
default String	asSerializableString() Returns a string that fully serializes this instance.
DataType	getOutputDataType() Returns the data type of the computation result.
List<ResolvedExpression>	getResolvedChildren()

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

accept, asSummaryString, getChildren

方法详细资料

asSerializableString

default String asSerializableString()

Returns a string that fully serializes this instance. The serialized string can be used for storing the query in, for example, a Catalog as a view.

返回:

detailed string for persisting in a catalog

getOutputDataType

DataType getOutputDataType()

Returns the data type of the computation result.

getResolvedChildren

List<ResolvedExpression> getResolvedChildren()