Package org.apache.flink.table.expressions

Class NestedFieldReferenceExpression

java.lang.Object

org.apache.flink.table.expressions.NestedFieldReferenceExpression

All Implemented Interfaces:

Expression, ResolvedExpression

@PublicEvolving
public class NestedFieldReferenceExpression
extends Object
implements ResolvedExpression

A reference to a nested field in an input. The reference contains:

• nested field names to traverse from the top level column to the nested leaf column.
• nested field indices to traverse from the top level column to the nested leaf column.
• type

Constructor Summary

Constructors

Constructor	Description
NestedFieldReferenceExpression(String[] fieldNames, int[] fieldIndices, DataType dataType)

Method Summary

Modifier and Type	Method	Description
<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()
int[]	getFieldIndices()
String[]	getFieldNames()
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

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

asSerializableString

Constructor Details

NestedFieldReferenceExpression

public NestedFieldReferenceExpression(String[] fieldNames,
 int[] fieldIndices,
 DataType dataType)

Method Details

getFieldNames

public String[] getFieldNames()

getFieldIndices

public int[] getFieldIndices()

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

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