Output a warning about MySQL Connector/J version up.

Author: hiroyuki-sato

embulk-output-mysql/src/main/java/org/embulk/output/mysql/MySQLOutputConnection.java

@@ -119,4 +119,20 @@ public void compareTimeZone() throws SQLException
         timeZoneComparison.compareTimeZone();
     }
 
+    //
+    //
+    // The MySQL Connector/J 5.1.35 introduce new option `Current MySQL Connect`.
+    // It has incompatibility behavior current version and 5.1.35.
+    //
+    // This method announces users about this change before the update driver version.
+    //
+    @Override
+    public void showDriverVersion() throws SQLException {
+        super.showDriverVersion();
+        logger.warn("This plugin will update MySQL Connector/J version in the near future release.");
+        logger.warn("It has some incompatibility changes.");
+        logger.warn("For example, the 5.1.35 introduced `noTimezoneConversionForDateType` and `cacheDefaultTimezone` options.");
+        logger.warn("Please read a document and make sure configuration carefully before updating the plugin.");
+    }
+
 }