Commits on Feb 22, 2021

1. opt: support UPDATE with partial UNIQUE WITHOUT INDEX constraints …

   This commit add uniqueness checks for partial `UNIQUE WITHOUT INDEX`
   constraints during `UPDATE` statements.
   
   As partial of this change, I discovered that cockroachdb#60535 introduced a
   regression where columns not required by uniqueness checks are not
   pruned. I've left TODOs in the column pruning tests and plan on fixing
   this in a follow-up PR.
   
   There is no release note because these constraints are gated behind the
   experimental_enable_unique_without_index_constraints session variable.
   
   Release note: None

   

   mgartner committed Feb 22, 2021
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