Github user viirya commented on the issue:
https://github.com/apache/spark/pull/13483
As the setting `spark.sql.retainGroupColumns` is set to true by default,
`GroupedData.agg` will retain group by columns. So the problem is you
explicitly ask the column `col1` when calling `agg` method. That is like when
users explicitly do `SELECT a, a`, but we automatically convert it to `SELECT
a`. Looks unreasonable to me.
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