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Add comment explaining the 0 for infinity timestamp

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Duy Dang
2025-10-07 19:46:26 +07:00
parent 26a3e069fb
commit 1c4a54a73c
1 changed files with 9 additions and 0 deletions
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9
core/mvcc/database/mod.rs
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@@ -1755,6 +1755,15 @@ impl<Clock: LogicalClock> MvStore<Clock> {
match ts_or_id {
Some(TxTimestampOrID::Timestamp(ts)) => *ts,
Some(TxTimestampOrID::TxID(tx_id)) => self.txs.get(tx_id).unwrap().value().begin_ts,
// This function is intended to be used in the ordering of row versions within the row version chain in `insert_version_raw`.
//
// The row version chain should be append-only (aside from garbage collection),
// so the specific ordering handled by this function may not be critical. We might
// be able to append directly to the row version chain in the future.
//
// The value 0 is used here to represent an infinite timestamp value. This is a deliberate
// choice for a planned future bitpacking optimization, reserving 0 for this purpose,
// while actual timestamps will start from 1.
None => 0,
}
}