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-rw-r--r--src/backend/utils/adt/datum.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/backend/utils/adt/datum.c b/src/backend/utils/adt/datum.c
index 535e4277ccb..071a7d4db16 100644
--- a/src/backend/utils/adt/datum.c
+++ b/src/backend/utils/adt/datum.c
@@ -209,6 +209,10 @@ datumTransfer(Datum value, bool typByVal, int typLen)
* of say the representation of zero in one's complement arithmetic).
* Also, it will probably not give the answer you want if either
* datum has been "toasted".
+ *
+ * Do not try to make this any smarter than it currently is with respect
+ * to "toasted" datums, because some of the callers could be working in the
+ * context of an aborted transaction.
*-------------------------------------------------------------------------
*/
bool