/*
 * Licensed 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
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 *  http://www.apache.org/licenses/LICENSE-2.0
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 * 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.
 *
 * Other licenses:
 * -----------------------------------------------------------------------------
 * Commercial licenses for this work are available. These replace the above
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 * database integrations.
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 * For more information, please visit: http://www.jooq.org/licenses
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package org.jooq;

import static org.jooq.SQLDialect.CUBRID;
// ...
import static org.jooq.SQLDialect.FIREBIRD_3_0;
// ...
// ...
// ...
import static org.jooq.SQLDialect.POSTGRES;
// ...
// ...
// ...
// ...

/**
 * This type is used for the window function DSL API.
 * <p>
 * Example: <code><pre>
 * field.firstValue()
 *      .ignoreNulls()
 *      .over()
 *      .partitionBy(AUTHOR_ID)
 *      .orderBy(PUBLISHED_IN.asc())
 *      .rowsBetweenUnboundedPreceding()
 *      .andUnboundedFollowing()
 * </pre></code>
 *
 * @param <T> The function return type
 * @author Lukas Eder
 */
public interface WindowPartitionByStep<T> extends WindowOrderByStep<T> {

    /**
     * Add a <code>PARTITION BY</code> clause to the window functions.
     */
    @Support({ CUBRID, FIREBIRD_3_0, POSTGRES })
    WindowOrderByStep<T> partitionBy(Field<?>... fields);

    /**
     * Add a <code>PARTITION BY 1</code> clause to the window functions, where
     * such a clause is required by the syntax of an RDBMS.
     * <p>
     * This clause is not supported as such in the CUBRID and Sybase dialects.
     * If you use it, jOOQ will simply ignore it.
     */
    @Support({ CUBRID, FIREBIRD_3_0, POSTGRES })
    WindowOrderByStep<T> partitionByOne();

}