Self review of previous patch. Fix assumption that xmax >= xmin.

diff --git a/src/backend/access/heap/heapam.c b/src/backend/access/heap/heapam.c
index cfbbc6301e3daba23bd885373c7f7af214369d6e..4fe3a7391090d6d3a6826d4601f04c603c21718b 100644 (file)
--- a/src/backend/access/heap/heapam.c
+++ b/src/backend/access/heap/heapam.c
@@ -3809,11 +3809,9 @@ HeapTupleHeaderAdvanceLatestRemovedXid(HeapTupleHeader tuple,
         !(tuple->t_infomask & HEAP_XMIN_INVALID) &&
         TransactionIdDidCommit(xmin)))
    {
-       if (TransactionIdFollows(xmax, xmin))
-       {
-           if (TransactionIdFollows(xmax, *latestRemovedXid))
+       if (xmax != xmin &&
+           TransactionIdFollows(xmax, *latestRemovedXid))
                *latestRemovedXid = xmax;
-       }
    }
 
    /* *latestRemovedXid may still be invalid at end */