On Mon, Aug 28, 2017 at 10:17 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> In the meantime, I think what we should do is commit the bug fix more or
> less as I have it, and then work on Amit's concern about losing parallel
> efficiency by separating the resetting of shared parallel-scan state
> into a new plan tree traversal that's done before launching new worker
> processes. The only real alternative is to lobotomize the existing rescan
> optimizations, and that seems like a really poor choice from here.
There's already ExecParallelReinitialize, which could be made to walk
the nodes in addition to what it does already, but I don't understand
exactly what else needs fixing.
--
Robert Haas
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