LiaCastaneda commented on issue #20195:
URL: https://github.com/apache/datafusion/issues/20195#issuecomment-4164116740

   @gene-bordegaray asked me in the meeting why a CASE + hash was decided to 
route dynamic filters, @adriangb you might remember better than me, but I think 
it was to avoid keeping a hash table with partition info + the whole build side 
hash table (which could cause memory issues). There were some discussions 
[here](https://github.com/apache/datafusion/pull/17529#discussion_r2460976149) 
and 
[here](https://github.com/apache/datafusion/issues/17171#issuecomment-3313002604)


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