jonathanc-n commented on PR #16443:
URL: https://github.com/apache/datafusion/pull/16443#issuecomment-3058063741

   @2010YOUY01 Special types need to only return the matching rows, so only one 
side needs to return rows while the other side can return a null array and not 
be projected in the final result. This functionality was only moved and had 
already existed before this pull request where most of it sits in 
`build_batch_from_indices`


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