org.apache.flink.table.operations

Class SortQueryOperation

java.lang.Object

org.apache.flink.table.operations.SortQueryOperation

All Implemented Interfaces:

Operation, QueryOperation

@Internal
public class SortQueryOperation
extends Object
implements QueryOperation

Expresses sort operation of rows of the underlying relational operation with given order. It also allows specifying offset and number of rows to fetch from the sorted data set/stream.

Constructor Summary

Constructors

Constructor and Description
SortQueryOperation(List<ResolvedExpression> order, QueryOperation child)
SortQueryOperation(List<ResolvedExpression> order, QueryOperation child, int offset, int fetch)

Method Summary

Modifier and Type	Method and Description
<T> T	accept(QueryOperationVisitor<T> visitor)
String	asSerializableString() Returns a string that fully serializes this instance.
String	asSummaryString() Returns a string that summarizes this operation for printing to a console.
QueryOperation	getChild()
List<QueryOperation>	getChildren()
int	getFetch()
int	getOffset()
List<ResolvedExpression>	getOrder()
ResolvedSchema	getResolvedSchema() Resolved schema of this operation.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SortQueryOperation

public SortQueryOperation(List<ResolvedExpression> order,
                          QueryOperation child)

SortQueryOperation

public SortQueryOperation(List<ResolvedExpression> order,
                          QueryOperation child,
                          int offset,
                          int fetch)

Method Detail

getOrder

public List<ResolvedExpression> getOrder()

getChild

public QueryOperation getChild()

getOffset

public int getOffset()

getFetch

public int getFetch()

getResolvedSchema

public ResolvedSchema getResolvedSchema()

Description copied from interface: QueryOperation

Resolved schema of this operation.

Specified by:

getResolvedSchema in interface QueryOperation

asSummaryString

public String asSummaryString()

Description copied from interface: Operation

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

Specified by:

asSummaryString in interface Operation

Returns:

summary string of this operation for debugging purposes

asSerializableString

public String asSerializableString()

Description copied from interface: QueryOperation

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

Specified by:

asSerializableString in interface QueryOperation

Returns:

detailed string for persisting in a catalog

See Also:

Operation.asSummaryString()

getChildren

public List<QueryOperation> getChildren()

Specified by:

getChildren in interface QueryOperation

accept

public <T> T accept(QueryOperationVisitor<T> visitor)

Specified by:

accept in interface QueryOperation