libenchao commented on PR #79:
URL: 
https://github.com/apache/flink-connector-jdbc/pull/79#issuecomment-1888926645

   > I am new to this area. I was looking to work within the existing design 
with minimal changes (as the design was added in a flip and works for scan 
queries. I think we have something that solves this critical issue - @libenchao 
would you be ok to proceed with this design and raise a subsequent issue / flip 
for a more elegant design. Or are you thinking this design is not appropriate 
and should not be merged? I need to look into your alternative proposals to 
understand them.
   
   I took a brief look at `JdbcRowDataLookupFunction`, and I now know why 
`JdbcRowDataLookupFunction` is slightly different from 
`JdbcRowDataInputFormat`, it's because `JdbcRowDataLookupFunction` uses 
`FieldNamedPreparedStatement` which does not allow `?` in the query. I'll try 
to come out with a solution with `FieldNamedPreparedStatement` in the coming 
days, but I cannot guarantee that I have enough time for that. So if you are 
confident with current PR, you can go ahead with merging it.


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