Correct obsolete unique index insertion comment.
Commit bc292937ae
failed to update a comment about unique index
checking. _bt_insertonpg() is no longer responsible for finding an
insertion location while preventing conflicting insertions.
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@ -247,7 +247,7 @@ top:
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* inserter can be making the check at one time. Furthermore, once we are
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* past the check we hold write locks continuously until we have performed
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* our insertion, so no later inserter can fail to see our insertion.
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* (This requires some care in _bt_insertonpg.)
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* (This requires some care in _bt_findinsertloc.)
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*
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* If we must wait for another xact, we release the lock while waiting,
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* and then must start over completely.
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