Remove misleading comment from pathnodes.h.
As of commit e5253fdc
, it is no longer true that the leader always
executes the subplan of a Gather Merge node. Remove comment to that
effect.
Back-patch to 11.
Discussion: https://postgr.es/m/CA%2BhUKGJEaZJYezXAOutuiWT%2BfxCA44%2BoKtVPAND2ubLiigR%3D-w%40mail.gmail.com
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@ -1465,8 +1465,7 @@ typedef struct GatherPath
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/*
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* GatherMergePath runs several copies of a plan in parallel and collects
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* the results, preserving their common sort order. For gather merge, the
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* parallel leader always executes the plan too, so we don't need single_copy.
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* the results, preserving their common sort order.
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*/
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typedef struct GatherMergePath
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{
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