hanyuzheng7 commented on code in PR #22842: URL: https://github.com/apache/flink/pull/22842#discussion_r1242874089
########## flink-table/flink-table-runtime/src/main/java/org/apache/flink/table/runtime/functions/scalar/MapUnionFunction.java: ########## @@ -0,0 +1,100 @@ +/* + * 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.flink.table.runtime.functions.scalar; + +import org.apache.flink.annotation.Internal; +import org.apache.flink.table.data.ArrayData; +import org.apache.flink.table.data.GenericArrayData; +import org.apache.flink.table.data.MapData; +import org.apache.flink.table.functions.BuiltInFunctionDefinitions; +import org.apache.flink.table.functions.SpecializedFunction; +import org.apache.flink.table.types.KeyValueDataType; + +import javax.annotation.Nullable; + +import java.util.HashMap; +import java.util.Map; + +/** Implementation of {@link BuiltInFunctionDefinitions#MAP_UNION}. */ +@Internal +public class MapUnionFunction extends BuiltInScalarFunction { + + private final ArrayData.ElementGetter keyElementGetter; + private final ArrayData.ElementGetter valueElementGetter; + + public MapUnionFunction(SpecializedFunction.SpecializedContext context) { + super(BuiltInFunctionDefinitions.MAP_UNION, context); + KeyValueDataType outputType = + ((KeyValueDataType) context.getCallContext().getOutputDataType().get()); + keyElementGetter = + ArrayData.createElementGetter(outputType.getKeyDataType().getLogicalType()); + valueElementGetter = + ArrayData.createElementGetter(outputType.getValueDataType().getLogicalType()); + } + + public @Nullable MapData eval(@Nullable MapData map1, @Nullable MapData map2) { + if (map1 == null || map2 == null) { + return null; + } + MapDataForMapUnion resultMap = new MapDataForMapUnion(map1, map2); + return resultMap; + } + + private class MapDataForMapUnion implements MapData { + private ArrayData keysArray; + private ArrayData valuesArray; + private final Map<Object, Object> map; + + public MapDataForMapUnion(MapData map1, MapData map2) { + + this.map = new HashMap<>(); Review Comment: I check the isEqual method in ARRAY_DISTINCT, but I cannot find it's source code. So I don't know the background logical of IsEqual. -- 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. To unsubscribe, e-mail: issues-unsubscr...@flink.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
