EventData的clone方法永远返回null？

[melonboy312]

代码如下：
public EventData clone() {
EventData data = new EventData();
data.setTableId(tableId);
data.setTableName(tableName);
data.setSchemaName(schemaName);
data.setDdlSchemaName(ddlSchemaName);
data.setEventType(eventType);
data.setExecuteTime(executeTime);
data.setKeys(cloneColumn(keys));
data.setColumns(cloneColumn(columns));
data.setOldKeys(cloneColumn(oldKeys));
data.setSize(size);
data.setPairId(pairId);
data.setSql(sql);
data.setSyncMode(syncMode);
data.setSyncConsistency(syncConsistency);
data.setRemedy(remedy);
data.setHint(hint);
data.setWithoutSchema(withoutSchema);
return null;
}

[agapple]

clone方法一直未使用，已修复