[I] [Variant] `variant_to_arrow` union builder does not preserve `variant_get` conversion semantics [arrow-rs]

["sdf-jkl (via GitHub)" <gi...@apache.org>]

sdf-jkl opened a new issue, #10905:
URL: https://github.com/apache/arrow-rs/issues/10905

   Here we use type-based info to determine which target the current variant should belong to. This seems incorrect
   1. Variant::Int64(1) can't convert to DataType::Int8, but this should valid when calling `variant_get`
   2. The logic in the current code (json -> variant, and variant spec), treats the exact number the same in Variant::Int64/Int32/Int16 etc(value has no strict type in variant) (like the `Equivalence Class` in parquet variant spec)
   
   _Originally posted by @klion26 in https://github.com/apache/arrow-rs/pull/10313#discussion_r3841121078_
               


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