viirya commented on issue #24637: [SPARK-27707][SQL] Prune unnecessary nested fields from Generate URL: https://github.com/apache/spark/pull/24637#issuecomment-572310533 Re-checked the current rule. Still cannot find clue from it and and above query plan. At first glance, I suspect if there are nested column access at the top Project but not in Generate. I tested it and re-checked the rule, looks it is good. @cloud-fan May you have more clues?
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