Commits on Dec 12, 2019

1. routing: improve dual and left joins …

   Fixes vitessio#4772
   Fixes vitessio#5508
   
   Previously, vitess was conservative about using vindexes for tables
   involving left joins. After some reasoning, we've determined that it's
   actually safe (and more efficient) to use them.
   
   In existing functionality, a reference table had to be on the RHS
   of the analysis. There was no benefit if it was on the LHS. When
   we changed dual to be a Reference tables, it caused a regression.
   If dual was on the LHS of a join or subquery, then it would get
   treated as cross-shard. The new change handles the case of ref
   tables to be on the LHS. This also fixes the regression.
   
   Signed-off-by: Sugu Sougoumarane <ssougou@gmail.com>

   

   sougou committed Dec 12, 2019
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