Github user fhueske commented on a diff in the pull request:

    https://github.com/apache/flink/pull/5441#discussion_r167902843
  
    --- Diff: 
flink-libraries/flink-sql-client/src/main/java/org/apache/flink/table/client/gateway/TypedResult.java
 ---
    @@ -0,0 +1,69 @@
    +/*
    + * 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.client.gateway;
    +
    +/**
    + * Result with an attached type (actual payload, EOS, etc.).
    + *
    + * @param <P> type of payload
    + */
    +public class TypedResult<P> {
    +
    +   private final Type type;
    +
    +   private final P payload;
    +
    +   private TypedResult(Type type, P payload) {
    +           this.type = type;
    +           this.payload = payload;
    +   }
    +
    +   public Type getType() {
    +           return type;
    +   }
    +
    +   public P getPayload() {
    +           return payload;
    +   }
    +
    +   // 
--------------------------------------------------------------------------------------------
    +
    +   public static <T> TypedResult<T> empty() {
    +           return new TypedResult<>(Type.EMPTY, null);
    +   }
    +
    +   public static <T> TypedResult<T> payload(T payload) {
    +           return new TypedResult<>(Type.PAYLOAD, payload);
    +   }
    +
    +   public static <T> TypedResult<T> endOfStream() {
    +           return new TypedResult<>(Type.EOS, null);
    +   }
    +
    +   // 
--------------------------------------------------------------------------------------------
    +
    +   /**
    +    * Result types.
    +    */
    +   public enum Type {
    --- End diff --
    
    Rename to `ResultType` to avoid confusion with `java.lang.reflect.Type`?


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