emecii commented on issue #50382:
URL: https://github.com/apache/arrow/issues/50382#issuecomment-5596555254

   I mapped the current `ArrowFormat` type families. I suggest one 
explicit-type path for every represented type:
   
   ```ruby
   ArrowFormat::ArrayBuilder.build(values, type: nil)
   ArrowFormat::Array.build(values, type: nil) # delegate
   ```
   
   Inference would stay conservative; empty/all-null values and ambiguous 
`Hash` values would require `type:`. Dictionary arrays also need a stateful 
`ArrayBuilder.new(type:)` API so memo/delta state can survive multiple `finish` 
calls.
   
   Two scope questions before I implement: does “all types” mean the existing 
`ArrowFormat::Type` subclasses, or also currently missing IPC types such as 
run-end encoded and view arrays? And should the stateful dictionary API ship 
together with the batch API?
   


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