[jira] [Created] (ARROW-17040) Add a new StructBuilder constructor to support some specific use cases

["Laurent Querel (Jira)" <ji...@apache.org>]

Laurent Querel created ARROW-17040:
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             Summary: Add a new StructBuilder constructor to support some specific use cases 
                 Key: ARROW-17040
                 URL: https://issues.apache.org/jira/browse/ARROW-17040
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Go
    Affects Versions: 8.0.0
            Reporter: Laurent Querel
             Fix For: 9.0.0


Currently, the `NewStructBuilder` constructor takes a struct data type and creates the constructor hierarchy itself. While interesting in most cases, this approach is not easy to integrate with some libraries.

This PR introduces a new constructor `UnsafeNewStructBuilderFromFields`. `UnsafeNewStructBuilderFromFields` returns a builder, using the provided memory allocator, the corresponding initialized fields and constructors. This method is unsafe because the caller must ensure that the fields and constructors are compatible and that the builders have the same length. 

Use case: Can be used by libraries that implement their own Arrow builders tree and ensure the validation of fields and builders by themselves.



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