ic4y commented on PR #2377:
URL: 
https://github.com/apache/incubator-seatunnel/pull/2377#issuecomment-1208840586

   > > > I imitate MySqlCatalog to DMCatalog, but I don't know it work. and the 
workflows is failed, I need some time to solve it,and I try to learn know how 
to do it rencently.
   > > 
   > > 
   > > Ask any questions at any time.
   > 
   > TypeMapper is in the method 
org.apache.seatunnel.connectors.seatunnel.jdbc.catalog.MySqlCatalog#fromJdbcType
   > 
   > but also in this method 
org.apache.seatunnel.connectors.seatunnel.jdbc.internal.dialect.mysql.MySqlTypeMapper
   > 
   > Any difference?
   
   There is really no difference between the two, This is indeed repeated in 
the implementation of the `catalog`. However, the catalog has not been started 
yet, so it is not necessary to implement the `catalog` related things.
   
   Refer to the implementation under the `jdbc.internal.dialect` package.


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