Commits on Jan 16, 2020

1. SQL: Extend the optimisations for equalities (elastic#50792) …

   * Extend the optimizations for equalities
   
   This commit supplements the optimisations of equalities in conjunctions
   and disjunctions:
   * for conjunctions, the existing optimizations with ranges are extended
   with not-equalities and inequalities; these lead to a fast resolution,
   the conjunction either being evaluate to a FALSE, or the non-equality
   conditions being dropped as superfluous;
   * optimisations for disjunctions are added to be applied against ranges,
   inequalities and not-equalities; these lead to disjunction either
   becoming TRUE or the equality being dropped, either as superfluous or
   merged into a range/inequality.
   
   * Adress review notes
   
   * Fix the bug around wrongly optimizing 'a=2 OR a!=?', which only yields
   TRUE for same values in equality and inequality.
   * Var renamings, code style adjustments, comments corrections.
   
   * Address further review comments. Extend optim.
   
   - fix a few code comments;
   - extend the Equals OR NotEquals optimitsation (a=2 OR a!=5 -> a!=5);
   - extend the Equals OR Range optimisation on limits equality (a=2 OR
     2<=a<5 -> 2<=a<5);
   - in case an equality is being removed in a conjunction, the rest of
     possible optimisations to test is now skipped.
   
   * rename one var for better legiblity
   
   - s/rmEqual/removeEquals
   
   (cherry picked from commit 62e7c6a)

   

   bpintea committed Jan 16, 2020
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