C comment: mention null handling in BuildTupleFromCStrings()

Discussion: https://postgr.es/m/CAFjFpRcF-wNbe0w-m3NpkEwr9shmOZ=GoESOzd2Wog9h55J8sA@mail.gmail.com

Author: Ashutosh Bapat

diff --git a/src/backend/executor/execTuples.c b/src/backend/executor/execTuples.c
index ea06aeedb210917365d81bce9620f5813f3b55b3..d14bf2ad69437c18a45ddf2489057c0b0edfcab9 100644 (file)
--- a/src/backend/executor/execTuples.c
+++ b/src/backend/executor/execTuples.c
@@ -1204,7 +1204,10 @@ BuildTupleFromCStrings(AttInMetadata *attinmeta, char **values)
        dvalues = (Datum *) palloc(natts * sizeof(Datum));
        nulls = (bool *) palloc(natts * sizeof(bool));
 
-       /* Call the "in" function for each non-dropped attribute */
+       /*
+        * Call the "in" function for each non-dropped attribute, even for nulls,
+        * to support domains.
+        */
        for (i = 0; i < natts; i++)
        {
                if (!TupleDescAttr(tupdesc, i)->attisdropped)