Fix: GROUPING SETS accept values without parenthesis #1867
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GROUPING SETScurrently accepts only tuples. It can be single elements as well.At least, I can see this behaviour in Hive and Snowflake:
https://hive.apache.org/docs/latest/30151323/
https://docs.snowflake.com/en/sql-reference/constructs/group-by-grouping-sets
This PR fixes this.