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Fix some grammar and typos in comments and docs
The documentation fixes are backpatched down to where they apply. Author: Justin Pryzby Discussion: https://postgr.es/m/20201031020801.GD3080@telsasoft.com Backpatch-through: 9.6
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@ -2915,7 +2915,7 @@ generate_useful_gather_paths(PlannerInfo *root, RelOptInfo *rel, bool override_r
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/*
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* If the path has no ordering at all, then we can't use either
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* incremental sort or rely on implict sorting with a gather
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* incremental sort or rely on implicit sorting with a gather
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* merge.
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*/
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if (subpath->pathkeys == NIL)
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@ -371,7 +371,7 @@ remove_rel_from_query(PlannerInfo *root, int relid, Relids joinrelids)
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* Likewise remove references from PlaceHolderVar data structures,
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* removing any no-longer-needed placeholders entirely.
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*
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* Removal is a bit tricker than it might seem: we can remove PHVs that
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* Removal is a bit trickier than it might seem: we can remove PHVs that
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* are used at the target rel and/or in the join qual, but not those that
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* are used at join partner rels or above the join. It's not that easy to
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* distinguish PHVs used at partner rels from those used in the join qual,
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