Package org.apache.flink.table.operations

Class WindowAggregateQueryOperation

java.lang.Object

org.apache.flink.table.operations.WindowAggregateQueryOperation

All Implemented Interfaces:

Operation, QueryOperation

@Internal
public class WindowAggregateQueryOperation
extends Object
implements QueryOperation

Relational operation that performs computations on top of subsets of input rows grouped by key and group window. It differs from AggregateQueryOperation by the group window.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	WindowAggregateQueryOperation.ResolvedGroupWindow	Wrapper for resolved expressions of a GroupWindow.

Constructor Summary

Constructors

Constructor	Description
WindowAggregateQueryOperation(List<ResolvedExpression> groupingExpressions, List<ResolvedExpression> aggregateExpressions, List<ResolvedExpression> windowPropertiesExpressions, WindowAggregateQueryOperation.ResolvedGroupWindow groupWindow, QueryOperation child, ResolvedSchema resolvedSchema)

Method Summary

Modifier and Type	Method	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.
List<ResolvedExpression>	getAggregateExpressions()
List<QueryOperation>	getChildren()
List<ResolvedExpression>	getGroupingExpressions()
WindowAggregateQueryOperation.ResolvedGroupWindow	getGroupWindow()
ResolvedSchema	getResolvedSchema()	Resolved schema of this operation.
List<ResolvedExpression>	getWindowPropertiesExpressions()

Methods inherited from class java.lang.Object

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

Constructor Detail

WindowAggregateQueryOperation

public WindowAggregateQueryOperation(List<ResolvedExpression> groupingExpressions,
                                     List<ResolvedExpression> aggregateExpressions,
                                     List<ResolvedExpression> windowPropertiesExpressions,
                                     WindowAggregateQueryOperation.ResolvedGroupWindow groupWindow,
                                     QueryOperation child,
                                     ResolvedSchema resolvedSchema)

Method Detail

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()

getGroupingExpressions

public List<ResolvedExpression> getGroupingExpressions()

getAggregateExpressions

public List<ResolvedExpression> getAggregateExpressions()

getWindowPropertiesExpressions

public List<ResolvedExpression> getWindowPropertiesExpressions()

getGroupWindow

public WindowAggregateQueryOperation.ResolvedGroupWindow getGroupWindow()

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