org.apache.hadoop.hive.ql.optimizer.calcite.functions.HiveSqlMinMaxAggFunction 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 org.apache.hadoop.hive.ql.optimizer.calcite.functions;
import org.apache.calcite.sql.SqlAggFunction;
import org.apache.calcite.sql.SqlFunctionCategory;
import org.apache.calcite.sql.SqlKind;
import org.apache.calcite.sql.SqlSplittableAggFunction;
import org.apache.calcite.sql.SqlSplittableAggFunction.SelfSplitter;
import org.apache.calcite.sql.type.SqlOperandTypeChecker;
import org.apache.calcite.sql.type.SqlOperandTypeInference;
import org.apache.calcite.sql.type.SqlReturnTypeInference;
public class HiveSqlMinMaxAggFunction extends SqlAggFunction {
public HiveSqlMinMaxAggFunction(SqlReturnTypeInference returnTypeInference,
SqlOperandTypeInference operandTypeInference, SqlOperandTypeChecker operandTypeChecker, boolean isMin) {
super(
isMin ? "min" : "max",
isMin ? SqlKind.MIN : SqlKind.MAX,
returnTypeInference,
operandTypeInference,
operandTypeChecker,
SqlFunctionCategory.NUMERIC);
}
@Override
public T unwrap(Class clazz) {
if (clazz == SqlSplittableAggFunction.class) {
return clazz.cast(SelfSplitter.INSTANCE);
}
return super.unwrap(clazz);
}
}