amaliujia commented on issue #1511: [CALCITE-3393] RelStructuredTypeFlattener: 
improve support for functions with struct input
URL: https://github.com/apache/calcite/pull/1511#issuecomment-544632093
 
 
   Hi @ihuzenko 
   
   > there is no need to disable flattener intentionally, because every client 
can simply avoid using it in their code
   
   Could you elaborate a bit more? Is there a way already can allow do not 
flatten struct?
   
   > Another big reason to use flattener is that rules aren't expected to 
handle structs and final plan may become less optimized than necessary
   
   I see. I remember rules generally don't care about types. But indeed who 
knows what it could break unless have a try. 
   
   

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