Commits on Sep 18, 2020

1. EQL: Disallow chained comparisons (elastic#62567) …

   Expressions like `1 = 2 = 3 = 4` or `1 < 2 = 3 >= 4` were treated with
   leftmost priority: ((1 = 2) = 3) = 4 which can lead to confusing
   results. Since such expressions don't make so much change for EQL
   filters we disallow them in the parser to prevent unexpected results
   from their bad usage.
   
   Major DBs like PostgreSQL and Oracle also disallow them in their SQL
   syntax. (counter example would be MySQL which interprets them as we did
   before with leftmost priority).
   
   Fixes: elastic#61654
   (cherry picked from commit 8f94981)

   

   matriv committed Sep 18, 2020
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