Github user fhueske commented on a diff in the pull request:
    --- Diff: 
    @@ -0,0 +1,87 @@
    + * 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
    + *
    + *
    + *
    + * 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.
    + */
    +import org.apache.flink.api.common.typeinfo.BasicTypeInfo;
    +import org.apache.flink.api.common.typeinfo.PrimitiveArrayTypeInfo;
    +import org.apache.flink.api.common.typeinfo.TypeInformation;
    +import org.apache.flink.api.common.typeutils.CompositeType;
    +import java.sql.Types;
    +import java.util.Collections;
    +import java.util.HashMap;
    +import java.util.Map;
    +import static 
    +import static 
    +import static 
    +import static 
    +import static 
    +import static 
    +import static 
    +import static 
    +import static 
    +import static 
    +import static 
    +import static 
    +class JDBCTypeUtil {
    +   private static final Map<BasicTypeInfo<?>, Integer> BASIC_TYPES;
    +   static {
    +           HashMap<BasicTypeInfo<?>, Integer> m = new HashMap<>();
    +           m.put(STRING_TYPE_INFO, Types.VARCHAR);
    +           m.put(BOOLEAN_TYPE_INFO, Types.BOOLEAN);
    +           m.put(BYTE_TYPE_INFO, Types.TINYINT);
    +           m.put(SHORT_TYPE_INFO, Types.SMALLINT);
    +           m.put(INT_TYPE_INFO, Types.INTEGER);
    +           m.put(LONG_TYPE_INFO, Types.BIGINT);
    +           m.put(FLOAT_TYPE_INFO, Types.FLOAT);
    +           m.put(DOUBLE_TYPE_INFO, Types.DOUBLE);
    +           m.put(CHAR_TYPE_INFO, Types.SMALLINT);
    --- End diff --
    `JDBCOutputFormat` will insert a `SMALLINT` by casting to `short`. This 
cast will fail for `Character`. 
    Please double check the type assignment and align it with 

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