Don’t forget parallel_enable in PL/SQL

While looking into why parallelism did not kick in for certain queries, I have found that those queries call PL/SQL functions. Yeah, yeah, there’s context switch. But even worse, the PL/SQL function did not declare parallel_enable in the spec. The lesson is every object referenced in the query need to enable parallelism(including those implicitly, like indexes) for parallel execution.

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