xiedeyantu commented on PR #4706:
URL: https://github.com/apache/calcite/pull/4706#issuecomment-3701144101

   > Yes, MAP simplifications will need a more extensive JIRA discussion. It is 
true that MAP values that have a different key cannot be equal, but it's not 
obvious how this information makes it all the way to the simplification code.
   
   I agree with you that there shouldn't be a set standard; each system can 
design according to its own requirements. Based on this, could Calcite also 
choose a system as its default behavior, such as Spark (which doesn't allow MAP 
comparisons)? Of course, this might be a bit of a tangent for this PR. 
Returning to the current PR, the current implementation only involves ARRAY and 
MULTISET. Is this implementation acceptable?


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