org.apache.flink.table.operations.utils.factories

Class AggregateOperationFactory

java.lang.Object

org.apache.flink.table.operations.utils.factories.AggregateOperationFactory

@Internal
public final class AggregateOperationFactory
extends Object

Utility class for creating a valid AggregateQueryOperation or WindowAggregateQueryOperation.

Constructor Summary

Constructors

Constructor and Description
AggregateOperationFactory(boolean isStreamingMode)

Method Summary

Modifier and Type	Method and Description
QueryOperation	createAggregate(List<org.apache.flink.table.expressions.ResolvedExpression> groupings, List<org.apache.flink.table.expressions.ResolvedExpression> aggregates, QueryOperation child) Creates a valid AggregateQueryOperation operation.
WindowAggregateQueryOperation.ResolvedGroupWindow	createResolvedWindow(GroupWindow window, ExpressionResolver resolver) Converts an API class to a resolved window for planning with expressions already resolved.
QueryOperation	createWindowAggregate(List<org.apache.flink.table.expressions.ResolvedExpression> groupings, List<org.apache.flink.table.expressions.ResolvedExpression> aggregates, List<org.apache.flink.table.expressions.ResolvedExpression> windowProperties, WindowAggregateQueryOperation.ResolvedGroupWindow window, QueryOperation child) Creates a valid WindowAggregateQueryOperation operation.
org.apache.flink.api.java.tuple.Tuple2<org.apache.flink.table.expressions.ResolvedExpression,List<String>>	extractTableAggFunctionAndAliases(org.apache.flink.table.expressions.Expression callExpr) Extract a table aggregate Expression and it's aliases.

Methods inherited from class java.lang.Object

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

Constructor Detail

AggregateOperationFactory

public AggregateOperationFactory(boolean isStreamingMode)

Method Detail

createAggregate

public QueryOperation createAggregate(List<org.apache.flink.table.expressions.ResolvedExpression> groupings,
                                      List<org.apache.flink.table.expressions.ResolvedExpression> aggregates,
                                      QueryOperation child)

Creates a valid AggregateQueryOperation operation.

Parameters:

groupings - expressions describing grouping key of aggregates

aggregates - expressions describing aggregation functions

child - relational operation on top of which to apply the aggregation

Returns:

valid aggregate operation

createWindowAggregate

public QueryOperation createWindowAggregate(List<org.apache.flink.table.expressions.ResolvedExpression> groupings,
                                            List<org.apache.flink.table.expressions.ResolvedExpression> aggregates,
                                            List<org.apache.flink.table.expressions.ResolvedExpression> windowProperties,
                                            WindowAggregateQueryOperation.ResolvedGroupWindow window,
                                            QueryOperation child)

Creates a valid WindowAggregateQueryOperation operation.

Parameters:

groupings - expressions describing grouping key of aggregates

aggregates - expressions describing aggregation functions

windowProperties - expressions describing window properties

window - grouping window of this aggregation

child - relational operation on top of which to apply the aggregation

Returns:

valid window aggregate operation

createResolvedWindow

public WindowAggregateQueryOperation.ResolvedGroupWindow createResolvedWindow(GroupWindow window,
                                                                              ExpressionResolver resolver)

Converts an API class to a resolved window for planning with expressions already resolved. It performs following validations:

• The alias is represented with an unresolved reference
• The time attribute is a single field reference of a TimeIndicatorTypeInfo(stream), SqlTimeTypeInfo(batch), or BasicTypeInfo.LONG_TYPE_INFO(batch) type
• The size & slide are value literals of either BasicTypeInfo.LONG_TYPE_INFO, or TimeIntervalTypeInfo type
• The size & slide are of the same type
• The gap is a value literal of a TimeIntervalTypeInfo type

Parameters:

window - window to resolve

resolver - resolver to resolve potential unresolved field references

Returns:

window with expressions resolved

extractTableAggFunctionAndAliases

public org.apache.flink.api.java.tuple.Tuple2<org.apache.flink.table.expressions.ResolvedExpression,List<String>> extractTableAggFunctionAndAliases(org.apache.flink.table.expressions.Expression callExpr)

Extract a table aggregate Expression and it's aliases.