xiaobaojiang opened a new issue #9035:
URL: https://github.com/apache/shardingsphere/issues/9035


   ## Bug Report
   
   ### Which version of ShardingSphere did you use?
   sharding-core-merge-4.0.0-RC1
   
![image](https://user-images.githubusercontent.com/16165731/104599003-34817980-56b2-11eb-8e52-ee4726bd691e.png)
   
   ### Which project did you use? ShardingSphere-JDBC or ShardingSphere-Proxy?
   ShardingSphere-JDBC
   ### Expected behavior
   
   ### Actual behavior
   ```
   Caused by: java.sql.SQLFeatureNotSupportedException: null
        at 
org.apache.shardingsphere.core.merge.dql.common.MemoryMergedResult.getValue(MemoryMergedResult.java:68)
        at 
org.apache.shardingsphere.shardingjdbc.jdbc.core.resultset.ShardingResultSet.getClob(ShardingResultSet.java:295)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.apache.ibatis.logging.jdbc.ResultSetLogger.invoke(ResultSetLogger.java:68)
        at com.sun.proxy.$Proxy161.getClob(Unknown Source)
        at 
org.apache.ibatis.type.ClobTypeHandler.getNullableResult(ClobTypeHandler.java:41)
        at 
org.apache.ibatis.type.ClobTypeHandler.getNullableResult(ClobTypeHandler.java:28)
        at 
org.apache.ibatis.type.BaseTypeHandler.getResult(BaseTypeHandler.java:66)
        at 
org.apache.ibatis.executor.resultset.DefaultResultSetHandler.applyAutomaticMappings(DefaultResultSetHandler.java:520)
        at 
org.apache.ibatis.executor.resultset.DefaultResultSetHandler.getRowValue(DefaultResultSetHandler.java:401)
        at 
org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValuesForSimpleResultMap(DefaultResultSetHandler.java:355)
        at 
org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValues(DefaultResultSetHandler.java:330)
        at 
org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSet(DefaultResultSetHandler.java:303)
        at 
org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSets(DefaultResultSetHandler.java:196)
        at 
org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:64)
        at 
org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:79)
        at 
org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:63)
        at 
org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:326)
        at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)
        at 
org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)
        at 
com.github.pagehelper.PageInterceptor.intercept(PageInterceptor.java:143)
        at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61)
        at com.sun.proxy.$Proxy159.query(Unknown Source)
        at 
org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148)
        at 
org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433)
        ... 139 common frames omitted
   ```
   ### Reason analyze (If you can)
   
   1. database: set column col1 type to varchar(40);
   2. jdbc connector: column co1 jdbctype is Clob.class
   3. getValue fail. throw new SQLFeatureNotSupportedException. 
   class: 
`org.apache.shardingsphere.core.merge.dql.common.MemoryMergedResult.getValue`
   ```
      @Override
       public final Object getValue(final String columnLabel, final Class<?> 
type) throws SQLException {
           if (Blob.class == type || Clob.class == type || Reader.class == type 
|| InputStream.class == type || SQLXML.class == type) {
               throw new SQLFeatureNotSupportedException();
           }
           Object result = 
currentResultSetRow.getCell(labelAndIndexMap.containsKey(columnLabel) ? 
labelAndIndexMap.get(columnLabel) : 
labelAndIndexMap.get(SQLUtil.getExactlyValue(columnLabel)));
           wasNull = null == result;
           return result;
       }
   ```
   
![image](https://user-images.githubusercontent.com/16165731/104599256-7f9b8c80-56b2-11eb-8ad9-80f22482880c.png)
   
   ### Steps to reproduce the behavior, such as: SQL to execute, sharding rule 
configuration, when exception occur etc.
   
   ### Example codes for reproduce this issue (such as a github link).
   


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