friendlymatthew commented on issue #18717:
URL: https://github.com/apache/datafusion/issues/18717#issuecomment-3534971632

   > Will this mean that I can compare an `Int32` array `[1, 2, 3]` with a 
`UnionArray(0: Float32, 1: Int32)` w/ values [[null, 2.0, null], [1, null, 
3]]`and get back`true, false, true`? I understand that's not implemented in 
this PR and this is low level infrastructure but I want to understand the big 
picture.
   
   No, the 2 PRs in arrow implements union-to-union comparison and the 
underlying row format support. Cross-type Union comparisons would be a 
separate, _(I think trickier)_ feature built on top of this


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