diff --git a/src/backend/executor/execPartition.c b/src/backend/executor/execPartition.c
index b2ee92eb15..233e3e9552 100644
--- a/src/backend/executor/execPartition.c
+++ b/src/backend/executor/execPartition.c
@@ -307,7 +307,8 @@ ExecInitPartitionInfo(ModifyTableState *mtstate,
 	ModifyTable *node = (ModifyTable *) mtstate->ps.plan;
 	Relation	rootrel = resultRelInfo->ri_RelationDesc,
 				partrel;
-	Relation	firstResultRel = mtstate->resultRelInfo[0].ri_RelationDesc;
+	Relation	firstResultRel = mtstate->resultRelInfo->ri_RelationDesc;
+	Index		firstVarno = mtstate->resultRelInfo->ri_RangeTableIndex;
 	ResultRelInfo *leaf_part_rri;
 	MemoryContext oldContext;
 	AttrNumber *part_attnos = NULL;
@@ -328,7 +329,7 @@ ExecInitPartitionInfo(ModifyTableState *mtstate,
 	leaf_part_rri = makeNode(ResultRelInfo);
 	InitResultRelInfo(leaf_part_rri,
 					  partrel,
-					  node ? node->nominalRelation : 1,
+					  firstVarno,
 					  rootrel,
 					  estate->es_instrument);
 
@@ -371,7 +372,6 @@ ExecInitPartitionInfo(ModifyTableState *mtstate,
 		List	   *wcoList;
 		List	   *wcoExprs = NIL;
 		ListCell   *ll;
-		int			firstVarno = mtstate->resultRelInfo[0].ri_RangeTableIndex;
 
 		/*
 		 * In the case of INSERT on a partitioned table, there is only one
@@ -437,7 +437,6 @@ ExecInitPartitionInfo(ModifyTableState *mtstate,
 		TupleTableSlot *slot;
 		ExprContext *econtext;
 		List	   *returningList;
-		int			firstVarno = mtstate->resultRelInfo[0].ri_RangeTableIndex;
 
 		/* See the comment above for WCO lists. */
 		Assert((node->operation == CMD_INSERT &&
@@ -495,7 +494,6 @@ ExecInitPartitionInfo(ModifyTableState *mtstate,
 	if (node && node->onConflictAction != ONCONFLICT_NONE)
 	{
 		TupleConversionMap *map = proute->parent_child_tupconv_maps[partidx];
-		int			firstVarno = mtstate->resultRelInfo[0].ri_RangeTableIndex;
 		TupleDesc	partrelDesc = RelationGetDescr(partrel);
 		ExprContext *econtext = mtstate->ps.ps_ExprContext;
 		ListCell   *lc;