[GitHub] [shardingsphere] TeslaCN commented on issue #22345: Testing grafana + shardingsphere + openGauss, grafana setup successfully, but execute ParseInt Error when logging in.

[GitBox <gi...@apache.org>]

TeslaCN commented on issue #22345:
URL: https://github.com/apache/shardingsphere/issues/22345#issuecomment-1323759687

   This could be reproduced by JDBC.
   
   ```sql
   create table t (id serial primary key, val varchar not null);
   ```
   
   ```java
           try (Connection connection = DriverManager.getConnection("jdbc:postgresql://127.0.0.1:55432/postgres?prepareThreshold=1", "postgres", "postgres")) {
               try (PreparedStatement preparedStatement = connection.prepareStatement("insert into t (val) values (?) returning id")) {
                   ResultSetMetaData metaData = preparedStatement.getMetaData();
                   metaData.getColumnName(1);
               }
           }
   ```
   
   ```
   Exception in thread "main" java.lang.NullPointerException: Cannot invoke "java.sql.ResultSetMetaData.getColumnLabel(int)" because "metaData" is null
   ```


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