On 27 March 2017 at 10:23, Tomas Vondra <tomas.von...@2ndquadrant.com> wrote:
> I'm not sure we need to invent a new magic value, though. Can we simply look
> at force_parallel_mode, and if it's 'regress' then tread 0 differently?

see standard_planner()

if (force_parallel_mode != FORCE_PARALLEL_OFF && best_path->parallel_safe)
Gather   *gather = makeNode(Gather);

Probably force_parallel_mode is good for testing the tuple queue code,
and some code in Gather, but I'm not quite sure what else its good
for. Certainly not GatherMerge.

 David Rowley                   http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services

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