com.hazelcast.org.apache.calcite.sql.fun.SqlNthValueAggFunction Maven / Gradle / Ivy
/*
* 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 com.hazelcast.org.apache.calcite.sql.fun;
import com.hazelcast.org.apache.calcite.sql.SqlAggFunction;
import com.hazelcast.org.apache.calcite.sql.SqlFunctionCategory;
import com.hazelcast.org.apache.calcite.sql.SqlKind;
import com.hazelcast.org.apache.calcite.sql.type.OperandTypes;
import com.hazelcast.org.apache.calcite.sql.type.ReturnTypes;
import com.hazelcast.org.apache.calcite.util.Optionality;
/**
* NTH_VALUE windowed aggregate function
* returns the value of an expression evaluated at the {@code n}th row of the
* window frame.
*/
public class SqlNthValueAggFunction extends SqlAggFunction {
public SqlNthValueAggFunction(SqlKind kind) {
super(kind.name(), null, kind, ReturnTypes.ARG0_NULLABLE_IF_EMPTY,
null, OperandTypes.ANY_NUMERIC, SqlFunctionCategory.NUMERIC, false,
true, Optionality.FORBIDDEN);
}
@Override public boolean allowsNullTreatment() {
return true;
}
}