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by VGHN7XDuOXPAzol
297 days ago
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Afaik Postgres doesn't. In my exposure it'd be quite uncommon for a b-tree to store the size of a subtree; would cause more churn/writes when updating trees. Perhaps some of the page-level Copy-on-Write databases (LMDB?) might do this, since they have to rewrite ancestor pages anyway. |
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