Adjust copy code to PG14 changes

PG14 changes initialization of ResultRelInfo, removes
es_num_result_relations and changes es_result_relations into an
array index by rangetable index.

https://github.com/postgres/postgres/commit/1375422c78

.github/workflows/postgres_dev.yaml

@@ -10,7 +10,7 @@ jobs:
       PG_INSTALL_DIR: postgresql
       MAKE_JOBS: 2
       # postgres version to build against this can either be commit hash, branch or tag
-      PG_COMMIT: 3d351d916b
+      PG_COMMIT: 1375422
       CLANG: clang-9
       LLVM_CONFIG: llvm-config-9
       CC: gcc

src/copy.c

@@ -241,8 +241,10 @@ copyfrom(CopyChunkState *ccstate, List *range_table, Hypertable *ht, void (*call
 
 	ExecOpenIndices(resultRelInfo, false);
 
+#if PG14_LT
 	estate->es_result_relations = resultRelInfo;
 	estate->es_num_result_relations = 1;
+#endif
 	estate->es_result_relation_info = resultRelInfo;
 	estate->es_range_table = range_table;
 
@@ -446,7 +448,12 @@ copyfrom(CopyChunkState *ccstate, List *range_table, Hypertable *ht, void (*call
 
 	ExecCloseIndices(resultRelInfo);
 	/* Close any trigger target relations */
+#if PG14_LT
 	ExecCleanUpTriggerState(estate);
+#else
+	ExecCloseResultRelations(estate);
+	ExecCloseRangeTableRelations(estate);
+#endif
 
 	/*
 	 * If we skipped writing WAL, then we need to sync the heap (but not

src/planner.c

@@ -330,7 +330,8 @@ timescaledb_planner(Query *parse, int cursor_opts, ParamListInfo bound_params)
 			{
 				Plan *subplan = (Plan *) lfirst(lc);
 
-				ts_hypertable_insert_fixup_tlist(subplan);
+				if (subplan)
+					ts_hypertable_insert_fixup_tlist(subplan);
 			}
 		}
 	}