Revert 764da77

Discussion: https://postgr.es/m/20230323003003.plgaxjqahjgkuxrk%40awork3.anarazel.de

Author: akorotkov

src/backend/executor/nodeModifyTable.c

@@ -1559,22 +1559,6 @@ ExecDelete(ModifyTableContext *context,
 					{
 						case TM_Ok:
 							Assert(context->tmfd.traversed);
-
-							/*
-							 * Save locked tuple for further processing of
-							 * RETURNING clause.
-							 */
-							if (processReturning &&
-								resultRelInfo->ri_projectReturning &&
-								!resultRelInfo->ri_FdwRoutine)
-							{
-								TupleTableSlot *returningSlot;
-
-								returningSlot = ExecGetReturningSlot(estate, resultRelInfo);
-								ExecCopySlot(returningSlot, inputslot);
-								ExecMaterializeSlot(returningSlot);
-							}
-
 							epqslot = EvalPlanQual(context->epqstate,
 												   resultRelationDesc,
 												   resultRelInfo->ri_RangeTableIndex,
@@ -1689,17 +1673,12 @@ ExecDelete(ModifyTableContext *context,
 		}
 		else
 		{
-			/*
-			 * Tuple can be already fetched to the returning slot in case
-			 * we've previously locked it.  Fetch the tuple only if the slot
-			 * is empty.
-			 */
 			slot = ExecGetReturningSlot(estate, resultRelInfo);
 			if (oldtuple != NULL)
 			{
 				ExecForceStoreHeapTuple(oldtuple, slot, false);
 			}
-			else if (TupIsNull(slot))
+			else
 			{
 				if (!table_tuple_fetch_row_version(resultRelationDesc, tupleid,
 												   SnapshotAny, slot))
@@ -2414,19 +2393,6 @@ ExecUpdate(ModifyTableContext *context, ResultRelInfo *resultRelInfo,
 						case TM_Ok:
 							Assert(context->tmfd.traversed);
 
-							/* Make sure ri_oldTupleSlot is initialized. */
-							if (unlikely(!resultRelInfo->ri_projectNewInfoValid))
-								ExecInitUpdateProjection(context->mtstate,
-														 resultRelInfo);
-
-							/*
-							 * Save the locked tuple for further calculation
-							 * of the new tuple.
-							 */
-							oldSlot = resultRelInfo->ri_oldTupleSlot;
-							ExecCopySlot(oldSlot, inputslot);
-							ExecMaterializeSlot(oldSlot);
-
 							epqslot = EvalPlanQual(context->epqstate,
 												   resultRelationDesc,
 												   resultRelInfo->ri_RangeTableIndex,
@@ -2435,6 +2401,18 @@ ExecUpdate(ModifyTableContext *context, ResultRelInfo *resultRelInfo,
 								/* Tuple not passing quals anymore, exiting... */
 								return NULL;
 
+							/* Make sure ri_oldTupleSlot is initialized. */
+							if (unlikely(!resultRelInfo->ri_projectNewInfoValid))
+								ExecInitUpdateProjection(context->mtstate,
+														 resultRelInfo);
+
+							/* Fetch the most recent version of old tuple. */
+							oldSlot = resultRelInfo->ri_oldTupleSlot;
+							if (!table_tuple_fetch_row_version(resultRelationDesc,
+															   tupleid,
+															   SnapshotAny,
+															   oldSlot))
+								elog(ERROR, "failed to fetch tuple being updated");
 							slot = ExecGetUpdateNewTuple(resultRelInfo,
 														 epqslot, oldSlot);
 							goto redo_act;