[GitHub] [spark] cloud-fan commented on pull request #30467: [SPARK-32002][SQL]Support ExtractValue from nested ArrayStruct

[GitBox <gi...@apache.org>]

cloud-fan commented on pull request #30467:
URL: https://github.com/apache/spark/pull/30467#issuecomment-740453544


   I don't think this is the right direction, as people will ask for more in the future, like supporting 3-level nested array. At the end, you can't even tell what `a.b` means, as `a` can be an arbitrarily nested array. I like the `unnest` from BigQuery as it has a clear semantic. The `explode` approach also works so I don't see why we need this feature. I'm fine to add `unnest` to Spark as an alternative to solve this use case.


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