org.apache.flink.table.expressions

Class LocalReferenceExpression

java.lang.Object

org.apache.flink.table.expressions.LocalReferenceExpression

All Implemented Interfaces:

Expression, ResolvedExpression

@Internal
public class LocalReferenceExpression
extends Object
implements ResolvedExpression

Reference to entity local to a certain QueryOperation. That entity does not come from any of the Operations input. It might be for example a group window in window aggregation.

Method Summary

Modifier and Type	Method and Description
<R> R	accept(ExpressionVisitor<R> visitor)
String	asSerializableString() Returns a string that fully serializes this instance.
String	asSummaryString() Returns a string that summarizes this expression for printing to a console.
boolean	equals(Object o)
List<Expression>	getChildren()
String	getName()
DataType	getOutputDataType() Returns the data type of the computation result.
List<ResolvedExpression>	getResolvedChildren()
int	hashCode()
String	toString()

Methods inherited from class java.lang.Object

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

Method Detail

getName

public String getName()

getOutputDataType

public DataType getOutputDataType()

Description copied from interface: ResolvedExpression

Returns the data type of the computation result.

Specified by:

getOutputDataType in interface ResolvedExpression

getResolvedChildren

public List<ResolvedExpression> getResolvedChildren()

Specified by:

getResolvedChildren in interface ResolvedExpression

asSummaryString

public String asSummaryString()

Description copied from interface: Expression

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

Specified by:

asSummaryString in interface Expression

Returns:

summary string of this expression for debugging purposes

asSerializableString

public String asSerializableString()

Description copied from interface: ResolvedExpression

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.

Specified by:

asSerializableString in interface ResolvedExpression

Returns:

detailed string for persisting in a catalog

getChildren

public List<Expression> getChildren()

Specified by:

getChildren in interface Expression

accept

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

Specified by:

accept in interface Expression

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object