Add downgrade script

sql/CMakeLists.txt

@@ -44,7 +44,7 @@ set(MOD_FILES
     updates/2.3.0--2.3.1.sql)
 
 # Files for downgrade scripts.
-set(REV_FILES)
+set(REV_FILES updates/2.3.1--2.3.0.sql)
 
 set(MODULE_PATHNAME "$libdir/timescaledb-${PROJECT_VERSION_MOD}")
 set(LOADER_PATHNAME "$libdir/timescaledb")
@@ -79,7 +79,7 @@ else()
         TARGET_VERSION
         ${_target_version}
         INPUT_DIRECTORY
-        ${CMAKE_CURRENT_SOURCE_DIR}/updates
+        ${CMAKE_CURRENT_SOURCE_DIR}
         FILES
         ${_downgrade_file})
     else()

sql/updates/2.3.1--2.3.0.sql

@@ -0,0 +1,33 @@
+DROP SCHEMA IF EXISTS timescaledb_experimental CASCADE;
+DROP FUNCTION IF EXISTS _timescaledb_internal.block_new_chunks;
+DROP FUNCTION IF EXISTS _timescaledb_internal.allow_new_chunks;
+DROP FUNCTION IF EXISTS _timescaledb_internal.refresh_continuous_aggregate;
+
+-- We need to rewrite all continuous aggregates to make sure that the
+-- queries do not contain qualification. They will be re-written in
+-- the post-update script as well, but the previous version does not
+-- process all continuous aggregates, leaving some with qualification
+-- for the standard functions. To make this work, we need to
+-- temporarily set the update stage to the post-update stage, which
+-- will allow the ALTER MATERIALIZED VIEW to rewrite the query. If
+-- that is not done, the TimescaleDB-specific hooks will not be used
+-- and you will get an error message saying that, for example,
+-- `conditions_summary` is not a materialized view.
+SET timescaledb.update_script_stage TO 'post';
+DO $$
+DECLARE
+ vname regclass;
+ materialized_only bool;
+ altercmd text;
+ ts_version TEXT;
+BEGIN
+    FOR vname, materialized_only IN select format('%I.%I', cagg.user_view_schema, cagg.user_view_name)::regclass, cagg.materialized_only from _timescaledb_catalog.continuous_agg cagg
+    LOOP
+	altercmd := format('ALTER MATERIALIZED VIEW %s SET (timescaledb.materialized_only=%L) ', vname::text, materialized_only);
+        EXECUTE altercmd;
+    END LOOP;
+    EXCEPTION WHEN OTHERS THEN RAISE;
+END
+$$;
+RESET timescaledb.update_script_stage;
+

sql/updates/reverse-dev.sql

@@ -1,33 +0,0 @@
-DROP SCHEMA IF EXISTS timescaledb_experimental CASCADE;
-DROP FUNCTION IF EXISTS _timescaledb_internal.block_new_chunks;
-DROP FUNCTION IF EXISTS _timescaledb_internal.allow_new_chunks;
-DROP FUNCTION IF EXISTS _timescaledb_internal.refresh_continuous_aggregate;
-
--- We need to rewrite all continuous aggregates to make sure that the
--- queries do not contain qualification. They will be re-written in
--- the post-update script as well, but the previous version does not
--- process all continuous aggregates, leaving some with qualification
--- for the standard functions. To make this work, we need to
--- temporarily set the update stage to the post-update stage, which
--- will allow the ALTER MATERIALIZED VIEW to rewrite the query. If
--- that is not done, the TimescaleDB-specific hooks will not be used
--- and you will get an error message saying that, for example,
--- `conditions_summary` is not a materialized view.
-SET timescaledb.update_script_stage TO 'post';
-DO $$
-DECLARE
- vname regclass;
- materialized_only bool;
- altercmd text;
- ts_version TEXT;
-BEGIN
-    FOR vname, materialized_only IN select format('%I.%I', cagg.user_view_schema, cagg.user_view_name)::regclass, cagg.materialized_only from _timescaledb_catalog.continuous_agg cagg
-    LOOP
-	altercmd := format('ALTER MATERIALIZED VIEW %s SET (timescaledb.materialized_only=%L) ', vname::text, materialized_only);
-        EXECUTE altercmd;
-    END LOOP;
-    EXCEPTION WHEN OTHERS THEN RAISE;
-END
-$$;
-RESET timescaledb.update_script_stage;
-