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Tweak some nbtree-related code comments.
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@ -1975,7 +1975,7 @@ bt_normalize_tuple(BtreeCheckState *state, IndexTuple itup)
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/*
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* Search for itup in index, starting from fast root page. itup must be a
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* non-pivot tuple. This is only supported with heapkeyspace indexes, since
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* we rely on having fully unique keys to find a match with only a signle
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* we rely on having fully unique keys to find a match with only a single
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* visit to a leaf page, barring an interrupted page split, where we may have
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* to move right. (A concurrent page split is impossible because caller must
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* be readonly caller.)
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