pabloem commented on pull request #15848:
URL: https://github.com/apache/beam/pull/15848#issuecomment-1023901471


   @mosche would you take a look at this change and let me know what you think?
   
   I suggest you look at the new integration tests in 
`JdbcIOAutoPartitioningIT`, you can see the intended usage: A user would pass 
the type of the partition column, and we automatically generate partition 
ranges.
   
   Some follow up changes are:
   - Automatically infer the upper and lower bound at pipeline runtime via 
`select min(col), max(col) from table`, so the user won't have to provide them.
   - Dynamic rebalancing: change ReadFn to work as a splittable DoFn that can 
sub-partition a range if it's going slow


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