Andreas Seltenreich <> writes:
> the following query against the regression database crashes master as of
> 23b09e15.

> select 1 from depth0 inner join depth1 on (depth0.c = depth1.c)
>          where depth0.c @@ depth1.c limit 1;

What's going on here is that add_partial_path is recycling a now-dominated
partial path without regard for the fact that there's already a GatherPath
pointing at that old partial path.  Later use of the GatherPath tries to
make use of its now-dangling subpath pointer.

I'd be inclined to think that it's silly to build GatherPaths in advance
of having finalized the list of partial paths for a rel.

                        regards, tom lane

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