dongjoon-hyun commented on issue #23353: [SPARK-26402][SQL] Accessing nested fields with different cases in case insensitive mode URL: https://github.com/apache/spark/pull/23353#issuecomment-449590080 @cloud-fan and @gatorsmile . I thought the error on `GROUP BY` queries are obvious bugs and this PR is helpful for `branch-2.4`. If this should not be in `branch-2.4`, please feel free to revert it in `branch-2.4`.
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