* Robert Haas (robertmh...@gmail.com) wrote: > For what it's worth, and I can't claim to have all the answers here, > this doesn't match my expectation. I think we'll do two kinds of > parallelism. One will be parallelism within nodes, like parallel sort > or parallel seqscan. Any node we parallelize this way is likely to be > heavily rewritten, or else to get a sister that looks quite different > from the original.
Sure.
> The other kind of parallelism will involve pushing
> a whole subtree of the plan into a different node. In this case we'll
> need to pass data between nodes in some different way (this was one of
> the major reasons I designed the shm_mq stuff) but the nodes
> themselves should change little if at all.
It's that "some different way" of passing data between the nodes that
makes me worry, but I hope you're right and we won't actually need to
change the interfaces or the nodes very much.
Thanks,
Stephen
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