KazydubB commented on a change in pull request #1869: DRILL-7254: Read Hive union w/o nulls URL: https://github.com/apache/drill/pull/1869#discussion_r332933924
########## File path: contrib/storage-hive/core/src/main/java/org/apache/drill/exec/store/hive/writers/complex/HiveUnionWriter.java ########## @@ -0,0 +1,47 @@ +/* + * 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.drill.exec.store.hive.writers.complex; + +import org.apache.drill.exec.store.hive.writers.HiveValueWriter; +import org.apache.drill.exec.store.hive.writers.primitive.AbstractSingleValueWriter; +import org.apache.hadoop.hive.serde2.objectinspector.UnionObjectInspector; + +public class HiveUnionWriter implements HiveValueWriter { + + private final HiveValueWriter[] unionFieldWriters; + + private final UnionObjectInspector unionObjectInspector; + + public HiveUnionWriter(HiveValueWriter[] unionFieldWriters, UnionObjectInspector unionObjectInspector) { + this.unionFieldWriters = unionFieldWriters; + this.unionObjectInspector = unionObjectInspector; + } + + @Override + public void write(Object value) { + int tag = unionObjectInspector.getTag(value); + Object field = unionObjectInspector.getField(value); + if (field == null) { + if (!(unionFieldWriters[tag] instanceof AbstractSingleValueWriter)) { + throw new UnsupportedOperationException("Null is not supported in Hive union for complex types!"); + } Review comment: Why skipping of primitive values is OK here? Similar `HiveValueWriter`s (`HiveListWriter`, `HiveStructWriter` and `HiveMapWriter`) don't yet support nulls and throw `UnsupportedOperationException` for both primitive and complex values. While this writer does not support null values, maybe it is better to throw the `Exception` too? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services
