com.blazebit.persistence.impl.function.window.denserank.DenseRankFunction Maven / Gradle / Ivy
/*
* Copyright 2014 - 2020 Blazebit.
*
* 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
*
* 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 com.blazebit.persistence.impl.function.window.denserank;
import com.blazebit.persistence.impl.function.window.AbstractWindowFunction;
import com.blazebit.persistence.spi.DbmsDialect;
/**
* Rank of the current row without gaps; this function counts peer groups
*
* @author Jan-Willem Gmelig Meyling
* @author Sayra Ranjha
* @since 1.4.0
*/
public class DenseRankFunction extends AbstractWindowFunction {
public static final String FUNCTION_NAME = "DENSE_RANK";
public DenseRankFunction(DbmsDialect dbmsDialect) {
super(FUNCTION_NAME, dbmsDialect.isNullSmallest(), dbmsDialect.supportsWindowNullPrecedence(), dbmsDialect.supportsFilterClause(), false);
}
@Override
public Class getReturnType(Class firstArgumentType) {
return Integer.class;
}
@Override
protected boolean requiresOver() {
return true;
}
}