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This module contains the Table/SQL API for writing table programs within the table ecosystem using the Java programming language.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.table.api;

import org.apache.flink.annotation.PublicEvolving;
import org.apache.flink.table.expressions.Expression;

import java.util.List;

/** Partially defined over window with partitioning. */
@PublicEvolving
public final class OverWindowPartitioned {

    /** Defines a partitioning of the input on one or more attributes. */
    private final List partitionBy;

    OverWindowPartitioned(List partitionBy) {
        this.partitionBy = partitionBy;
    }

    /**
     * Specifies the time attribute on which rows are ordered.
     *
     * For streaming tables, reference a rowtime or proctime time attribute here to specify the
     * time mode.
     *
     * For batch tables, refer to a timestamp or long attribute.
     *
     * @param orderBy field reference
     * @return an over window with defined order
     */
    public OverWindowPartitionedOrdered orderBy(Expression orderBy) {
        return new OverWindowPartitionedOrdered(partitionBy, orderBy);
    }
}