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Sergey Petrunya 2a16e7674b BUG#913030: Optimizer chooses a suboptimal excution plan for Q18 from DBT-3
- When doing join optimization, pre-sort the tables so that they mimic the execution
  order we've had with 'semijoin=off'. 
- That way, we will not get regressions when there are two query plans (the old and the
  new) that have indentical costs but different execution times (because of factors that
  the optimizer was not able to take into account).
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