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(parent: 7ad642d) | patch

Optimize the case where a btree indexscan has current and mark positions

Optimize the case where a btree indexscan has current and mark positions
on the same index page; we can avoid data copying as well as buffer refcount
manipulations in this common case. Makes for a small but noticeable
improvement in mergejoin speed.

Heikki Linnakangas

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