julianhyde commented on issue #1457: [WIP][Prototype][CALCITE-3340] TUMBLE as a 
TableFunction 
URL: https://github.com/apache/calcite/pull/1457#issuecomment-535647198
 
 
   I take your point that with the limited namespace we can't have two 
different functions called TUMBLE.
   
   Therefore changing the Parser.jj seems to make sense.
   
   However, we see the future as being TUMBLE (or any user-defined table 
function) in the FROM clause. Therefore how about adding parser support for 
TUMBLE (and HOP) in the GROUP BY clause? This would be deprecated 
functionality, and removed at some point. The parser would be hard-wired to 
create calls to that function, and therefore function does not need to be 
called literally TUMBLE. It could be called "TUMBLE_OLD" or whatever.

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