Fix Xmax freeze conditions

I broke this in 0ac5ad5134; previously, freezing a tuple marked with an
IS_MULTI xmax was not necessary.

Per brokenness report from Jeff Janes.

diff --git a/src/backend/access/heap/heapam.c b/src/backend/access/heap/heapam.c
index 39c3ee27559e32fac8ad513a9f7d780532ea7564..d2267266548005bd7cea624b56e5b6a849e6cbbb 100644 (file)
--- a/src/backend/access/heap/heapam.c
+++ b/src/backend/access/heap/heapam.c
@@ -5113,10 +5113,11 @@ heap_freeze_tuple(HeapTupleHeader tuple, TransactionId cutoff_xid,
     * cutoff; it doesn't remove dead members of a very old multixact.
     */
    xid = HeapTupleHeaderGetRawXmax(tuple);
-   if (TransactionIdIsNormal(xid) &&
-       (((!(tuple->t_infomask & HEAP_XMAX_IS_MULTI) &&
-          TransactionIdPrecedes(xid, cutoff_xid))) ||
-        MultiXactIdPrecedes(xid, cutoff_multi)))
+   if ((tuple->t_infomask & HEAP_XMAX_IS_MULTI) ?
+       (MultiXactIdIsValid(xid) &&
+        MultiXactIdPrecedes(xid, cutoff_multi)) :
+       (TransactionIdIsNormal(xid) &&
+        TransactionIdPrecedes(xid, cutoff_xid)))
    {
        HeapTupleHeaderSetXmax(tuple, InvalidTransactionId);