paleolimbot opened a new pull request, #12:
URL: https://github.com/apache/arrow-nanoarrow/pull/12

   Fixes #6.
   
   This PR adds functions `ArrowMetadataBuilderAppend()` (for blindly but 
efficiently adding a key/value pair to the end of some metadata) and 
`ArrowMetadataBuilderSet()` (to less efficiently replace or remove a value for 
key).
   
   The use case I had in mind is building extension type metadata from some 
input (i.e., make an output schema like the input except with new extension 
type or with new serialized extension type metadata). It's rather difficult to 
replicate the "replace" or "remove" behaviour otherwise.


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