Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/18692
> The point of this issue is not performance improvement, but that some (in
our case automatically generated) queries do not work at all with SPARK,
whereas there is no problem with these queries in PostgreSQL and MySQL.
I'm surprised to hear this, did you turn on CROSS JOIN via
`spark.sql.crossJoin.enabled`?
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