Remove new structure member from ResultRelInfo.

In commit ffbb7e65a, I added a ModifyTableState member to ResultRelInfo
to save the owning ModifyTableState for use by nodeModifyTable.c when
performing batch inserts, but as pointed out by Tom Lane, that changed
the array stride of es_result_relations, and that would break any
previously-compiled extension code that accesses that array.  Fix by
removing that member from ResultRelInfo and instead adding a List member
at the end of EState to save such ModifyTableStates.

Per report from Tom Lane.  Back-patch to v14, like the previous commit;
I chose to apply the patch to HEAD as well, to make back-patching easy.

Discussion: http://postgr.es/m/4065383.1669395453%40sss.pgh.pa.us

1 files changed, 16 insertions, 15 deletions

diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index a3988b11754..596b9a1efad 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -858,10 +858,12 @@ ExecInsert(ModifyTableContext *context,
 
 			/*
 			 * If these are the first tuples stored in the buffers, add the
-			 * target rel to the es_insert_pending_result_relations list,
-			 * except in the case where flushing was done above, in which case
-			 * the target rel would already have been added to the list, so no
-			 * need to do this.
+			 * target rel and the mtstate to the
+			 * es_insert_pending_result_relations and
+			 * es_insert_pending_modifytables lists respectively, execpt in
+			 * the case where flushing was done above, in which case they
+			 * would already have been added to the lists, so no need to do
+			 * this.
 			 */
 			if (resultRelInfo->ri_NumSlots == 0 && !flushed)
 			{
@@ -870,6 +872,8 @@ ExecInsert(ModifyTableContext *context,
 				estate->es_insert_pending_result_relations =
 					lappend(estate->es_insert_pending_result_relations,
 							resultRelInfo);
+				estate->es_insert_pending_modifytables =
+					lappend(estate->es_insert_pending_modifytables, mtstate);
 			}
 			Assert(list_member_ptr(estate->es_insert_pending_result_relations,
 								   resultRelInfo));
@@ -1219,12 +1223,14 @@ ExecBatchInsert(ModifyTableState *mtstate,
 static void
 ExecPendingInserts(EState *estate)
 {
-	ListCell   *lc;
+	ListCell   *l1,
+			   *l2;
 
-	foreach(lc, estate->es_insert_pending_result_relations)
+	forboth(l1, estate->es_insert_pending_result_relations,
+			l2, estate->es_insert_pending_modifytables)
 	{
-		ResultRelInfo *resultRelInfo = (ResultRelInfo *) lfirst(lc);
-		ModifyTableState *mtstate = resultRelInfo->ri_ModifyTableState;
+		ResultRelInfo *resultRelInfo = (ResultRelInfo *) lfirst(l1);
+		ModifyTableState *mtstate = (ModifyTableState *) lfirst(l2);
 
 		Assert(mtstate);
 		ExecBatchInsert(mtstate, resultRelInfo,
@@ -1236,7 +1242,9 @@ ExecPendingInserts(EState *estate)
 	}
 
 	list_free(estate->es_insert_pending_result_relations);
+	list_free(estate->es_insert_pending_modifytables);
 	estate->es_insert_pending_result_relations = NIL;
+	estate->es_insert_pending_modifytables = NIL;
 }
 
 /*
@@ -4342,13 +4350,6 @@ ExecInitModifyTable(ModifyTable *node, EState *estate, int eflags)
 		}
 		else
 			resultRelInfo->ri_BatchSize = 1;
-
-		/*
-		 * If doing batch insert, setup back-link so we can easily find the
-		 * mtstate again.
-		 */
-		if (resultRelInfo->ri_BatchSize > 1)
-			resultRelInfo->ri_ModifyTableState = mtstate;
 	}
 
 	/*