gatorsmile commented on issue #24872: [SPARK-28023][SQL] Trim the string when 
cast string type to Boolean/Numeric types
URL: https://github.com/apache/spark/pull/24872#issuecomment-509442950
 
 
   We are unable to 100% match the semantics of PostgreSQL. Adding the extra 
`trim` for the Boolean/Numeric type casting will impact the perf of a common 
operation, although it is not high. Based on the above discussions, it might 
not be worth it to support this corner case. 
   
   I think, in the future, we can add the PostgreSQL-compatible mode for 
supporting all the corner cases. This effort will be big. If we decide to add 
it, it might need 1000+ JIRAs and PRs.

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