viirya opened a new pull request #23719: [SPARK-26808][SQL] Pruned schema should not change nullability URL: https://github.com/apache/spark/pull/23719 ## What changes were proposed in this pull request? We prune unnecessary nested fields from requested schema when reading Parquet. Now seems we don't keep original nullability in pruned schema. We should keep original nullability. ## How was this patch tested? Added unit test.
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