maropu commented on issue #23942: [SPARK-27033][SQL]Add Optimize rule 
RewriteArithmeticFiltersOnIntegralColumn
URL: https://github.com/apache/spark/pull/23942#issuecomment-473130097
 
 
   Ah, I see. If we could follow the ANSI standard, this optimization 
(comparison rewriting) looks reasonable. Anyway, in this pr, we need to narrow 
down the optimization target to `eq` only.

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