Commits on Apr 28, 2019

1. SQL: Remove "useFallback" feature. …

   This feature allows Calcite's Bindable interpreter to be bolted on
   top of Druid queries and table scans. I think it should be removed for
   a few reasons:
   
   1. It is not recommended for production anyway, because it generates
   unscalable query plans (e.g. it will plan a join into two table scans
   and then try to do the entire join in memory on the broker).
   2. It doesn't work with Druid-specific SQL functions, like TIME_FLOOR,
   REGEXP_EXTRACT, APPROX_COUNT_DISTINCT, etc.
   3. It makes the SQL planning code needlessly complicated.
   
   With SQL coming out of experimental status soon, it's a good opportunity
   to remove this feature.

   

   gianm committed Apr 28, 2019
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