org.apache.flink.table.planner.expressions

Class RexNodeExpression

java.lang.Object

org.apache.flink.table.planner.expressions.RexNodeExpression

All Implemented Interfaces:

Expression, ResolvedExpression

@Internal
public final class RexNodeExpression
extends Object
implements ResolvedExpression

Wrapper for a ResolvedExpression that originated from a RexNode.

If the RexNode was generated from a SQL expression, the expression can be made string serializable and print the original SQL string as a summary.

Constructor Summary

Constructors

Constructor and Description
RexNodeExpression(org.apache.calcite.rex.RexNode rexNode, DataType outputDataType, String summaryString, String serializableString)

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()
DataType	getOutputDataType() Returns the data type of the computation result.
List<ResolvedExpression>	getResolvedChildren()
org.apache.calcite.rex.RexNode	getRexNode()
int	hashCode()
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

RexNodeExpression

public RexNodeExpression(org.apache.calcite.rex.RexNode rexNode,
                         DataType outputDataType,
                         @Nullable
                         String summaryString,
                         @Nullable
                         String serializableString)

Method Detail

getRexNode

public org.apache.calcite.rex.RexNode getRexNode()

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

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

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object