[I] [Variant] Use row-oriented builders in `cast_to_variant` [arrow-rs]

["scovich (via GitHub)" <gi...@apache.org>]

scovich opened a new issue, #8310:
URL: https://github.com/apache/arrow-rs/issues/8310

   **Is your feature request related to a problem or challenge? Please describe what you are trying to do.**
   
   While reviewing other code, I noticed that `cast_to_variant` uses an inefficient column-oriented approach to building variant values. For primitive types this works ok, but for deeply nested types it means repeatedly creating new variants (and variant metadata), only to re-code them by copying the variant values to new arrays (with new metadata and field ids). Very expensive.
   
   **Describe the solution you'd like**
   
   Use a row-oriented builder approach, similar to what `variant_get` uses.
   
   


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Re: [I] [Variant] Use row-oriented builders in `cast_to_variant` [arrow-rs]

["alamb (via GitHub)" <gi...@apache.org>]

alamb closed issue #8310: [Variant] Use row-oriented builders in `cast_to_variant`
URL: https://github.com/apache/arrow-rs/issues/8310


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