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Try again to fix the way the scanjoin_target is used with partial paths.

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Commit 04ae11f62e removed some broken
code to apply the scan/join target to partial paths, but its theory
that this processing step is totally unnecessary turns out to be wrong.
Put similar code back again, but this time, check for parallel-safety
and avoid in-place modifications to paths that may already have been
used as part of some other path.

(This is not an entirely elegant solution to this problem; it might
be better, for example, to postpone generate_gather_paths for the
topmost scan/join rel until after the scan/join target has been
applied.  But this is not the time for such redesign work.)

Amit Kapila and Robert Haas
This commit is contained in:
Robert Haas
2016-06-17 16:25:02 -04:00
parent ede62e56fb
commit 54f5c5150f
7 changed files with 133 additions and 10 deletions
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3
src/include/optimizer/pathnode.h
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@@ -143,7 +143,8 @@ extern ProjectionPath *create_projection_path(PlannerInfo *root,
extern Path *apply_projection_to_path(PlannerInfo *root,
RelOptInfo *rel,
Path *path,
PathTarget *target);
PathTarget *target,
bool target_parallel);
extern SortPath *create_sort_path(PlannerInfo *root,
RelOptInfo *rel,
Path *subpath,