There was discussion in [1] about improvements to list manipulation in several places. But since the discussion is not related to the topic in that thread, fork a new thread here and attach a patch to show my thoughts.
Some are just cosmetic changes by using macros. The others should have performance gain from the avoidance of moving list entries. But I doubt the performance gain can be noticed or measured, as currently there are only a few places affected by the change. I still think the changes are worthwhile though, because it is very likely that future usage of the same scenario can benefit from these changes. (Copying in David and Ranier. Ranier provided a patch about the changes in list.c, but I'm not using that one.) [1] https://www.postgresql.org/message-id/CAMbWs49aakL%3DPP7NcTajCtDyaVUE-NMVMGpaLEKreYbQknkQWA%40mail.gmail.com Thanks Richard
v1-0001-Improve-list-manipulation-in-several-places.patch
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