diff --git a/src/backend/executor/execMain.c b/src/backend/executor/execMain.c
index 791f336..f9b8d0e 100644
--- a/src/backend/executor/execMain.c
+++ b/src/backend/executor/execMain.c
@@ -1680,6 +1680,7 @@ ExecBuildSlotValueDescription(TupleTableSlot *slot, int maxfieldlen)
 	StringInfoData buf;
 	TupleDesc	tupdesc = slot->tts_tupleDescriptor;
 	int			i;
+	bool		write_comma = false;
 
 	/* Make sure the tuple is fully deconstructed */
 	slot_getallattrs(slot);
@@ -1693,6 +1694,10 @@ ExecBuildSlotValueDescription(TupleTableSlot *slot, int maxfieldlen)
 		char	   *val;
 		int			vallen;
 
+		/* Ignore dropped column */
+		if (tupdesc->attrs[i]->attisdropped)
+			continue;
+
 		if (slot->tts_isnull[i])
 			val = "null";
 		else
@@ -1705,7 +1710,10 @@ ExecBuildSlotValueDescription(TupleTableSlot *slot, int maxfieldlen)
 			val = OidOutputFunctionCall(foutoid, slot->tts_values[i]);
 		}
 
-		if (i > 0)
+		/* Do not write a comma for first visible column of tuple string */
+		if (!write_comma)
+			write_comma = true;
+		else
 			appendStringInfoString(&buf, ", ");
 
 		/* truncate if needed */