org.apache.flink.table.expressions

Interface ResolvedExpression

All Superinterfaces:

Expression

All Known Implementing Classes:

AggregateExpression, CallExpression, FieldReferenceExpression, LocalReferenceExpression, NestedFieldReferenceExpression, RexNodeExpression, TableReferenceExpression, 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.

Method Summary

Modifier and Type	Method and Description
default String	asSerializableString() Returns a string that fully serializes this instance.
DataType	getOutputDataType() Returns the data type of the computation result.
List<ResolvedExpression>	getResolvedChildren()

Methods inherited from interface org.apache.flink.table.expressions.Expression

accept, asSummaryString, getChildren

Method Detail

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.

Returns:

detailed string for persisting in a catalog

getOutputDataType

DataType getOutputDataType()

Returns the data type of the computation result.

getResolvedChildren

List<ResolvedExpression> getResolvedChildren()