alamb commented on issue #19929:
URL: https://github.com/apache/datafusion/issues/19929#issuecomment-3807871343

   > Another optimization iteration.
   
   > Try to push b = 1.
   > supports_filters_pushdown returns [Exact]. Of course, the table provider 
can’t remember
   > all previously pushed filters, so it has no choice but to answer Exact.
   > Now, the optimizer thinks the conjunction a = 1 AND b = 1 is supported 
exactly, but it is not.
   
   
   What do you think about extending the "can pushdown filters" API somehow to 
include filters that are already planned to be pushed down?
   
   


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