morningman commented on pull request #3604:

   > 1 make HASH_TBL_SPACE_OVERHEAD a configurable param,but it seems not a 
common solution, because I'm not sure what factors can affect the real hash 
table size.
   > 2 maybe we can disable broadcast when dim table exceeds 100M
   These 2 solutions looks seem, that both require manual parameter adjustment. 
This is no different from directly adding hints manually.

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