Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/18544#discussion_r201157527 --- Diff: sql/hive/src/test/java/org/apache/spark/sql/hive/execution/UDAFEmpty.java --- @@ -0,0 +1,32 @@ +/* + * 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.spark.sql.hive.execution; + +import org.apache.hadoop.hive.ql.parse.SemanticException; +import org.apache.hadoop.hive.ql.udf.generic.AbstractGenericUDAFResolver; +import org.apache.hadoop.hive.ql.udf.generic.GenericUDAFEvaluator; +import org.apache.hadoop.hive.serde2.typeinfo.TypeInfo; + +/** + * An empty UDAF that throws a semantic exception + */ +public class UDAFEmpty extends AbstractGenericUDAFResolver { + @Override + public GenericUDAFEvaluator getEvaluator(TypeInfo[] info) throws SemanticException { + throw new SemanticException("Can not get a evaluator of the empty UDAF"); --- End diff -- Nit: `a evaluator` -> `an evaluator`
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