tgravescs commented on pull request #29869:
URL: https://github.com/apache/spark/pull/29869#issuecomment-701548103


   thanks for the explanation but that isn't the intention of that field.  Not 
making things worse is great but doesn't indicate whether it is user facing. I 
can add a completely new api to RDD that if not used doesn't "break" anything 
but its adding a user facing API and extra functionality that needs to be 
documented so the user knows its there and can use it. this "api" change is 
meant for end users to use, so how do they know its there to use - most users 
don't go read the code to find little options like this.  this is adding a 
somewhat obscure special prefix which does special things. I'm not sure I 
really like that approach. The nice thing about it is it doesn't require any 
function API changes, but that also makes it not as obvious. 


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