alamb opened a new pull request, #7912:
URL: https://github.com/apache/arrow-rs/pull/7912

   # Which issue does this PR close?
   
   - closes https://github.com/apache/arrow-rs/issues/7805
   - part of https://github.com/apache/arrow-rs/issues/6736
   - part of https://github.com/apache/arrow-rs/pull/7911
   
   # Rationale for this change
   
   I would like to be able to write Variants directly into the target buffer 
when writing multiple variants However, the current VariantBuilder allocates a 
new bufffer for each variant
   
   # What changes are included in this PR?
   
   1. Add `VariantBuilder::new_with_buffers` and docs and tests
   
   # Are these changes tested?
   Yes new tests
   
   # Are there any user-facing changes?
   New API


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