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

Class SortOperationFactory

java.lang.Object

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

@Internal
public class SortOperationFactory
extends Object

Utility class for creating a valid SortQueryOperation operation.

Constructor Summary

Constructors

Constructor and Description
SortOperationFactory(boolean isStreamingMode)

Method Summary

Modifier and Type	Method and Description
QueryOperation	createLimitWithFetch(int fetch, QueryOperation child) Adds fetch to the underlying SortQueryOperation if it is a valid one.
QueryOperation	createLimitWithOffset(int offset, QueryOperation child) Adds offset to the underlying SortQueryOperation if it is a valid one.
QueryOperation	createSort(List<org.apache.flink.table.expressions.ResolvedExpression> orders, QueryOperation child, ExpressionResolver.PostResolverFactory postResolverFactory) Creates a valid SortQueryOperation operation.

Methods inherited from class java.lang.Object

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

Constructor Detail

SortOperationFactory

public SortOperationFactory(boolean isStreamingMode)

Method Detail

createSort

public QueryOperation createSort(List<org.apache.flink.table.expressions.ResolvedExpression> orders,
                                 QueryOperation child,
                                 ExpressionResolver.PostResolverFactory postResolverFactory)

Creates a valid SortQueryOperation operation.

NOTE: if the collation is not explicitly specified for any expression, it is wrapped in a default ascending order

Parameters:

orders - expressions describing order,

child - relational expression on top of which to apply the sort operation

Returns:

valid sort operation

createLimitWithOffset

public QueryOperation createLimitWithOffset(int offset,
                                            QueryOperation child)

Adds offset to the underlying SortQueryOperation if it is a valid one.

Parameters:

offset - offset to add

child - should be SortQueryOperation

Returns:

valid sort operation with applied offset

createLimitWithFetch

public QueryOperation createLimitWithFetch(int fetch,
                                           QueryOperation child)

Adds fetch to the underlying SortQueryOperation if it is a valid one.

Parameters:

fetch - fetch number to add

child - should be SortQueryOperation

Returns:

valid sort operation with applied fetch