xiedeyantu commented on PR #21075:
URL: https://github.com/apache/datafusion/pull/21075#issuecomment-4292652477

   > Agree, it is good there are no performance regressions. Let me go through 
it one final time.
   > 
   > Another thing: let's have the rule disabled by default to avoid 
optimization false positives, and potential user query degradation. We would 
need to add description of this change to `Upgrade guide` for DataFusion 54.0.0 
release. So the users would know what is this rule, how it works, and for what 
type of queries it is reasonable to enable the rule config.
   > 
   > Generally speaking, going forward we need to document optimization rules 
and technics in a separate doc, so the users are able to check all optimization 
rules DataFusion is capable of and also how and when to use/enable/disable rules
   
   @comphead Thank you for the guidance. Could you let me know a specific 
location where I can mimic the previous style to add the upgrade documentation 
you mentioned, and then change the configuration parameters to false.


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