viirya opened a new pull request #24179: [SPARK-27241][SQL] Support map_keys in SelectedField URL: https://github.com/apache/spark/pull/24179 ## What changes were proposed in this pull request? `SelectedField` doesn't support map_keys for now. When map key is complex struct, we should be able to prune unnecessary fields from keys. This proposes to add map_keys support to `SelectedField`. ## How was this patch tested? Added tests.
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