You have in your keys (index 7 and 8) nulls. That’s why it’s failing.
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Okay, I tried to take null values by Object.isNull and filtering out by Boolean mark. the issue is List.uniqueValues is not working
i sort this issue is by converting to string.
How can i make list.groupByKey work
one issue with List.countOccurances
GroupType has no compare operators, it seems. You can convert to String…