create 9.5-1 udfs and update citus--9.4-1--9.5-1.sql

src/backend/distributed/sql/citus--9.4-1--9.5-1.sql

@@ -6,6 +6,7 @@
 #include "udfs/citus_drop_trigger/9.5-1.sql"
 #include "udfs/worker_record_sequence_dependency/9.5-1.sql"
 #include "udfs/citus_finish_pg_upgrade/9.5-1.sql"
+#include "udfs/citus_prepare_pg_upgrade/9.5-1.sql"
 
 SET search_path = 'pg_catalog';
 

src/backend/distributed/sql/udfs/citus_prepare_pg_upgrade/9.5-1.sql

@@ -0,0 +1,53 @@
+CREATE OR REPLACE FUNCTION pg_catalog.citus_prepare_pg_upgrade()
+    RETURNS void
+    LANGUAGE plpgsql
+    SET search_path = pg_catalog
+    AS $cppu$
+BEGIN
+    --
+    -- Drop existing backup tables
+    --
+    DROP TABLE IF EXISTS public.pg_dist_partition;
+    DROP TABLE IF EXISTS public.pg_dist_shard;
+    DROP TABLE IF EXISTS public.pg_dist_placement;
+    DROP TABLE IF EXISTS public.pg_dist_node_metadata;
+    DROP TABLE IF EXISTS public.pg_dist_node;
+    DROP TABLE IF EXISTS public.pg_dist_local_group;
+    DROP TABLE IF EXISTS public.pg_dist_transaction;
+    DROP TABLE IF EXISTS public.pg_dist_colocation;
+    DROP TABLE IF EXISTS public.pg_dist_authinfo;
+    DROP TABLE IF EXISTS public.pg_dist_poolinfo;
+    DROP TABLE IF EXISTS public.pg_dist_rebalance_strategy;
+
+    --
+    -- backup citus catalog tables
+    --
+    CREATE TABLE public.pg_dist_partition AS SELECT * FROM pg_catalog.pg_dist_partition;
+    CREATE TABLE public.pg_dist_shard AS SELECT * FROM pg_catalog.pg_dist_shard;
+    CREATE TABLE public.pg_dist_placement AS SELECT * FROM pg_catalog.pg_dist_placement;
+    CREATE TABLE public.pg_dist_node_metadata AS SELECT * FROM pg_catalog.pg_dist_node_metadata;
+    CREATE TABLE public.pg_dist_node AS SELECT * FROM pg_catalog.pg_dist_node;
+    CREATE TABLE public.pg_dist_local_group AS SELECT * FROM pg_catalog.pg_dist_local_group;
+    CREATE TABLE public.pg_dist_transaction AS SELECT * FROM pg_catalog.pg_dist_transaction;
+    CREATE TABLE public.pg_dist_colocation AS SELECT * FROM pg_catalog.pg_dist_colocation;
+    -- enterprise catalog tables
+    CREATE TABLE public.pg_dist_authinfo AS SELECT * FROM pg_catalog.pg_dist_authinfo;
+    CREATE TABLE public.pg_dist_poolinfo AS SELECT * FROM pg_catalog.pg_dist_poolinfo;
+    CREATE TABLE public.pg_dist_rebalance_strategy AS SELECT
+        name,
+        default_strategy,
+        shard_cost_function::regprocedure::text,
+        node_capacity_function::regprocedure::text,
+        shard_allowed_on_node_function::regprocedure::text,
+        default_threshold,
+        minimum_threshold
+    FROM pg_catalog.pg_dist_rebalance_strategy;
+
+    -- store upgrade stable identifiers on pg_dist_object catalog
+    UPDATE citus.pg_dist_object
+       SET (type, object_names, object_args) = (SELECT * FROM pg_identify_object_as_address(classid, objid, objsubid));
+END;
+$cppu$;
+
+COMMENT ON FUNCTION pg_catalog.citus_prepare_pg_upgrade()
+    IS 'perform tasks to copy citus settings to a location that could later be restored after pg_upgrade is done';

src/backend/distributed/sql/udfs/citus_prepare_pg_upgrade/latest.sql

@@ -18,7 +18,7 @@ BEGIN
     DROP TABLE IF EXISTS public.pg_dist_authinfo;
     DROP TABLE IF EXISTS public.pg_dist_poolinfo;
     DROP TABLE IF EXISTS public.pg_dist_rebalance_strategy;
-        
+
     --
     -- backup citus catalog tables
     --