On Thu, Oct 17, 2019 at 11:20 AM Tom Lane <tgl@sss.pgh.pa.us> wrote:
Erwin Brandstetter <brsaweda@gmail.com> writes: >> The following operations are always parallel restricted. >> - Scans of common table expressions (CTEs).
> Now I am unsure whether I can use `PARALLEL SAFE` for functions containing > a CTE (while fulfilling all other criteria)?
AFAIR, the reason for treating CTEs as parallel restricted is simply to guarantee single evaluation of the CTE. Within a function, that would only matter per-function-execution, so I can't see why a function containing such a query couldn't be pushed down to workers for execution.
