Github user nsyca commented on the issue:
https://github.com/apache/spark/pull/14411
@hvanhovell ,
Yes. I agree that we need to block this case. I was under the impression
that the tablesample clause is supported only when referenced to a base table,
not a derived table. It's clearly not in Spark. I will add code to prevent it.
On the `NOT IN` topic, let me spend some time arranging my thought then I
will open a JIRA.
thanks.
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