Fix regression in updating equi-join optimization #686
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Fixes a regression that broke some updating join queries that were not being properly optimized to equijoins, leading to runtime errors like
The primary fix is to re-enable an optimization that was disabled in #623. I have also added test cases for this class of query, and tightened up the planner checks to fail updating queries that do not include an equijoin condition (and thus could produce this runtime error).