PG16: Remove support of Multi-Node

Since multi-node has being deprecated we'll not support it on PG16. In
the following releases we're working on completely remove it from the
TimescaleDB.

src/hypertable.c

@@ -68,6 +68,7 @@
 #include "debug_assert.h"
 #include "osm_callbacks.h"
 #include "error_utils.h"
+#include "compat/compat.h"
 
 Oid
 ts_rel_get_owner(Oid relid)
@@ -2046,6 +2047,13 @@ ts_hypertable_create(PG_FUNCTION_ARGS)
 Datum
 ts_hypertable_distributed_create(PG_FUNCTION_ARGS)
 {
+#if PG16_GE
+	ereport(ERROR,
+			(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+			 errmsg("distributed hypertable is not supported"),
+			 errhint("Multi-node is not supported anymore starting on PostgreSQL >= 16."),
+			 errdetail("Use the \"create_hypertable\" to create a regular hypertable instead.")));
+#endif
 	return ts_hypertable_create_time_prev(fcinfo, true);
 }
 

tsl/src/data_node.c

@@ -857,12 +857,24 @@ data_node_add_internal(PG_FUNCTION_ARGS, bool set_distid)
 Datum
 data_node_add(PG_FUNCTION_ARGS)
 {
+#if PG16_GE
+	ereport(ERROR,
+			(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+			 errmsg("adding data node is not supported"),
+			 errhint("Multi-node is not supported anymore starting on PostgreSQL >= 16.")));
+#endif
 	return data_node_add_internal(fcinfo, true);
 }
 
 Datum
 data_node_add_without_dist_id(PG_FUNCTION_ARGS)
 {
+#if PG16_GE
+	ereport(ERROR,
+			(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+			 errmsg("adding data node is not supported"),
+			 errhint("Multi-node is not supported anymore starting on PostgreSQL >= 16.")));
+#endif
 	return data_node_add_internal(fcinfo, false);
 }