index 153d1712ef3a2cef4452f8f00a03a722ba6e4057..0ca4fa5d25665b8024d496654d6e762cb4a80532 100644 (file)
@@ -1116,9 +1116,9 @@ SnapBuildProcessRunningXacts(SnapBuild *builder, XLogRecPtr lsn, xl_running_xact
* so, because we only need to do it for catalog transactions since we
* only ever look at those.
*
- * NB: Because of that xmax can be lower than xmin, because we only
- * increase xmax when a catalog modifying transaction commits. While odd
- * looking, it's correct and actually more efficient this way since we hit
+ * NB: We only increase xmax when a catalog modifying transaction commits
+ * (see SnapBuildCommitTxn). Because of this, xmax can be lower than xmin,
+ * which looks odd but is correct and actually more efficient, since we hit
* fast paths in tqual.c.
*/
builder->xmin = running->oldestRunningXid;