## 2.17.0

This release contains performance improvements and bug fixes since
the 2.16.1 release. We recommend that you upgrade at the next
available opportunity.

**Features**
* timescale#6882: Allow DELETE on the compressed chunks without decompression.
* timescale#7033 Use MERGE statement on CAgg Refresh
* timescale#7126: Add functions to show the compression information.
* timescale#7147: Vectorize partial aggregation for `sum
* timescale#7200: Vectorize common aggregate functions like `min`, `max`, `sum`, `avg`, `stddev`, `variance` for compressed columns of arithmetic types, when there is grouping on segmentby columns or no grouping.
* timescale#7204: Track additional extensions in telemetry.
* timescale#7207: Refactor the `decompress_batches_scan` functions for easier maintenance.
* timescale#7209: Add a function to drop the `osm` chunk.
* timescale#7275: Add support for RETURNING clause for MERGE
* timescale#7295 Support ALTER TABLE SET ACCESS METHOD on hypertable

**Bugfixes**
* timescale#7187: Fix the string literal length for the `compressed_data_info` function.
* timescale#7191: Fix creating default indexes on chunks when migrating the data.
* timescale#7195: Fix the `segment by` and `order by` checks when dropping a column from a compressed hypertable.
* timescale#7201: Use the generic extension description when building `apt` and `rpm` loader packages.
* timescale#7227: Add an index to the `compression_chunk_size` catalog table.
* timescale#7229: Fix the foreign key constraints where the index and the constraint column order are different.
* timescale#7230: Do not propagate the foreign key constraints to the `osm` chunk.
* timescale#7234: Release the cache after accessing the cache entry.
* timescale#7258 Force English in the pg_config command executed by cmake to avoid unexpected building errors
* timescale#7270 Fix memory leak in compressed DML batch filtering
* timescale#7286: Fix index column check while searching for index
* timescale#7290 Add check for NULL offset for caggs built on top of caggs
* timescale#7301 Make foreign key behaviour for hypertables consistent
* timescale#7318: Fix chunk skipping range filtering
* timescale#7320 Set license specific extension comment in install script

**Thanks**
* @MiguelTubio for reporting and fixing a Windows build error
* @posuch for reporting the misleading extension description in the generic loader packages.
* @snyrkill for discovering and reporting the issue

CHANGELOG.md

@@ -4,6 +4,48 @@
 `psql` with the `-X` flag to prevent any `.psqlrc` commands from
 accidentally triggering the load of a previous DB version.**
 
+
+## 2.17.0 (2024-10-08)
+
+This release contains performance improvements and bug fixes since
+the 2.16.1 release. We recommend that you upgrade at the next
+available opportunity.
+
+
+**Features**
+* #6882: Allow DELETE on the compressed chunks without decompression.
+* #7033 Use MERGE statement on CAgg Refresh
+* #7126: Add functions to show the compression information.
+* #7147: Vectorize partial aggregation for `sum(int4)` with grouping on `segment by` columns.
+* #7200: Vectorize common aggregate functions like `min`, `max`, `sum`, `avg`, `stddev`, `variance` for compressed columns of arithmetic types, when there is grouping on segmentby columns or no grouping.
+* #7204: Track additional extensions in telemetry.
+* #7207: Refactor the `decompress_batches_scan` functions for easier maintenance.
+* #7209: Add a function to drop the `osm` chunk.
+* #7275: Add support for RETURNING clause for MERGE
+* #7295 Support ALTER TABLE SET ACCESS METHOD on hypertable
+
+**Bugfixes**
+* #7187: Fix the string literal length for the `compressed_data_info` function.
+* #7191: Fix creating default indexes on chunks when migrating the data.
+* #7195: Fix the `segment by` and `order by` checks when dropping a column from a compressed hypertable.
+* #7201: Use the generic extension description when building `apt` and `rpm` loader packages.
+* #7227: Add an index to the `compression_chunk_size` catalog table.
+* #7229: Fix the foreign key constraints where the index and the constraint column order are different.
+* #7230: Do not propagate the foreign key constraints to the `osm` chunk.
+* #7234: Release the cache after accessing the cache entry.
+* #7258 Force English in the pg_config command executed by cmake to avoid unexpected building errors
+* #7270 Fix memory leak in compressed DML batch filtering
+* #7286: Fix index column check while searching for index
+* #7290 Add check for NULL offset for caggs built on top of caggs
+* #7301 Make foreign key behaviour for hypertables consistent
+* #7318: Fix chunk skipping range filtering
+* #7320 Set license specific extension comment in install script
+
+**Thanks**
+* @MiguelTubio for reporting and fixing a Windows build error
+* @posuch for reporting the misleading extension description in the generic loader packages.
+* @snyrkill for discovering and reporting the issue
+
 ## 2.16.1 (2024-08-06)
 
 This release contains bug fixes since the 2.16.0 release. We recommend

sql/CMakeLists.txt

@@ -42,11 +42,12 @@ set(MOD_FILES
     updates/2.15.1--2.15.2.sql
     updates/2.15.2--2.15.3.sql
     updates/2.15.3--2.16.0.sql
-    updates/2.16.0--2.16.1.sql)
+    updates/2.16.0--2.16.1.sql
+    updates/2.16.1--2.17.0.sql)
 
 # The downgrade file to generate a downgrade script for the current version, as
 # specified in version.config
-set(CURRENT_REV_FILE reverse-dev.sql)
+set(CURRENT_REV_FILE 2.17.0--2.16.1.sql)
 # Files for generating old downgrade scripts. This should only include files for
 # downgrade from one version to its previous version since we do not support
 # skipping versions when downgrading.
@@ -84,7 +85,8 @@ set(OLD_REV_FILES
     2.15.2--2.15.1.sql
     2.15.3--2.15.2.sql
     2.16.0--2.15.3.sql
-    2.16.1--2.16.0.sql)
+    2.16.1--2.16.0.sql
+    2.17.0--2.16.1.sql)
 
 set(MODULE_PATHNAME "$libdir/timescaledb-${PROJECT_VERSION_MOD}")
 set(LOADER_PATHNAME "$libdir/timescaledb")

sql/updates/2.16.1--2.17.0.sql

@@ -0,0 +1,11 @@
+CREATE FUNCTION _timescaledb_functions.compressed_data_info(_timescaledb_internal.compressed_data)
+    RETURNS TABLE (algorithm name, has_nulls bool)
+    AS '@MODULE_PATHNAME@', 'ts_update_placeholder'
+    LANGUAGE C STRICT IMMUTABLE SET search_path = pg_catalog, pg_temp;
+
+CREATE INDEX compression_chunk_size_idx ON _timescaledb_catalog.compression_chunk_size (compressed_chunk_id);
+
+CREATE FUNCTION _timescaledb_functions.drop_osm_chunk(hypertable REGCLASS)
+	RETURNS BOOL
+	AS '@MODULE_PATHNAME@', 'ts_update_placeholder'
+	LANGUAGE C VOLATILE;

sql/updates/2.17.0--2.16.1.sql

@@ -0,0 +1,119 @@
+-- check whether we can safely downgrade the existing compression setup
+CREATE OR REPLACE FUNCTION _timescaledb_functions.add_sequence_number_metadata_column(
+	comp_ch_schema_name text,
+	comp_ch_table_name text
+)
+	RETURNS BOOL LANGUAGE PLPGSQL AS
+$BODY$
+DECLARE
+	chunk_schema_name text;
+	chunk_table_name text;
+	index_name text;
+	segmentby_columns text;
+BEGIN
+	SELECT ch.schema_name, ch.table_name INTO STRICT chunk_schema_name, chunk_table_name
+	FROM _timescaledb_catalog.chunk ch
+	INNER JOIN  _timescaledb_catalog.chunk comp_ch
+	ON ch.compressed_chunk_id = comp_ch.id
+	WHERE comp_ch.schema_name = comp_ch_schema_name
+	AND comp_ch.table_name = comp_ch_table_name;
+
+    IF NOT FOUND THEN
+		RAISE USING
+			ERRCODE = 'feature_not_supported',
+			MESSAGE = 'Cannot migrate compressed chunk to version 2.16.1, chunk not found';
+    END IF;
+
+	-- Add sequence number column to compressed chunk
+	EXECUTE format('ALTER TABLE %s.%s ADD COLUMN _ts_meta_sequence_num INT DEFAULT NULL', comp_ch_schema_name, comp_ch_table_name);
+
+	-- Remove all indexes from compressed chunk
+	FOR index_name IN
+		SELECT format('%s.%s', i.schemaname, i.indexname)
+		FROM pg_indexes i
+		WHERE i.schemaname = comp_ch_schema_name
+		AND i.tablename = comp_ch_table_name
+	LOOP
+		EXECUTE format('DROP INDEX %s;', index_name);
+	END LOOP;
+
+	-- Fetch the segmentby columns from compression settings
+	SELECT string_agg(cs.segmentby_column, ',') INTO segmentby_columns
+	FROM (
+		SELECT unnest(segmentby)
+		FROM _timescaledb_catalog.compression_settings
+		WHERE relid = format('%s.%s', comp_ch_schema_name, comp_ch_table_name)::regclass::oid
+		AND segmentby IS NOT NULL
+	) AS cs(segmentby_column);
+
+	-- Create compressed chunk index based on sequence num metadata column
+	-- If there is no segmentby columns, we can skip creating the index
+    IF FOUND AND segmentby_columns IS NOT NULL THEN
+		EXECUTE format('CREATE INDEX ON %s.%s (%s, _ts_meta_sequence_num);', comp_ch_schema_name, comp_ch_table_name, segmentby_columns);
+    END IF;
+
+	-- Mark compressed chunk as unordered
+	-- Marking the chunk status bit (2) makes it unordered
+	-- and disables some optimizations. In order to re-enable
+	-- them, you need to recompress these chunks.
+	UPDATE _timescaledb_catalog.chunk
+	SET status = status | 2 -- set unordered bit
+	WHERE schema_name = chunk_schema_name
+	AND table_name = chunk_table_name;
+
+	RETURN true;
+END
+$BODY$ SET search_path TO pg_catalog, pg_temp;
+
+DO $$
+DECLARE
+	chunk_count int;
+	chunk_record record;
+BEGIN
+    -- if we find chunks which don't have sequence number metadata column in
+	-- compressed chunk, we need to stop downgrade and have the user run
+	-- a migration script to re-add the missing columns
+	SELECT count(*) INTO STRICT chunk_count
+	FROM _timescaledb_catalog.chunk ch
+	INNER JOIN _timescaledb_catalog.chunk uncomp_ch
+	ON uncomp_ch.compressed_chunk_id = ch.id
+	WHERE not exists (
+		SELECT
+		FROM pg_attribute att
+		WHERE attrelid=format('%I.%I',ch.schema_name,ch.table_name)::regclass
+		AND attname='_ts_meta_sequence_num')
+	AND NOT uncomp_ch.dropped;
+
+	-- Doing the migration if we find 10 or less chunks that need to be migrated
+	IF chunk_count > 10 THEN
+      RAISE USING
+        ERRCODE = 'feature_not_supported',
+        MESSAGE = 'Cannot downgrade compressed hypertables with chunks that do not contain sequence numbers. Run timescaledb--2.17-2.16.1.sql migration script before downgrading.',
+        DETAIL = 'Number of chunks that need to be migrated: '|| chunk_count::text;
+	ELSIF chunk_count > 0 THEN
+		FOR chunk_record IN
+		SELECT comp_ch.*
+		FROM _timescaledb_catalog.chunk ch
+		INNER JOIN _timescaledb_catalog.chunk comp_ch
+		ON ch.compressed_chunk_id = comp_ch.id
+		WHERE not exists (
+			SELECT
+			FROM pg_attribute att
+			WHERE attrelid=format('%I.%I',comp_ch.schema_name,comp_ch.table_name)::regclass
+			AND attname='_ts_meta_sequence_num')
+			AND NOT ch.dropped
+		LOOP
+			PERFORM  _timescaledb_functions.add_sequence_number_metadata_column(chunk_record.schema_name, chunk_record.table_name);
+			RAISE LOG 'Migrated compressed chunk %s.%s to version 2.16.1', chunk_record.schema_name, chunk_record.table_name;
+		END LOOP;
+
+		RAISE LOG 'Migration successful!';
+	END IF;
+END
+$$;
+
+DROP FUNCTION _timescaledb_functions.add_sequence_number_metadata_column(text, text);
+
+DROP FUNCTION _timescaledb_functions.compressed_data_info(_timescaledb_internal.compressed_data);
+DROP INDEX _timescaledb_catalog.compression_chunk_size_idx;
+DROP FUNCTION IF EXISTS _timescaledb_functions.drop_osm_chunk(REGCLASS);

sql/updates/latest-dev.sql

@@ -1,11 +0,0 @@
-CREATE FUNCTION _timescaledb_functions.compressed_data_info(_timescaledb_internal.compressed_data)
-    RETURNS TABLE (algorithm name, has_nulls bool)
-    AS '@MODULE_PATHNAME@', 'ts_update_placeholder'
-    LANGUAGE C STRICT IMMUTABLE SET search_path = pg_catalog, pg_temp;
-
-CREATE INDEX compression_chunk_size_idx ON _timescaledb_catalog.compression_chunk_size (compressed_chunk_id);
-
-CREATE FUNCTION _timescaledb_functions.drop_osm_chunk(hypertable REGCLASS)
-	RETURNS BOOL
-	AS '@MODULE_PATHNAME@', 'ts_update_placeholder'
-	LANGUAGE C VOLATILE;

sql/updates/reverse-dev.sql

@@ -1,119 +0,0 @@
--- check whether we can safely downgrade the existing compression setup
-CREATE OR REPLACE FUNCTION _timescaledb_functions.add_sequence_number_metadata_column(
-	comp_ch_schema_name text,
-	comp_ch_table_name text
-)
-	RETURNS BOOL LANGUAGE PLPGSQL AS
-$BODY$
-DECLARE
-	chunk_schema_name text;
-	chunk_table_name text;
-	index_name text;
-	segmentby_columns text;
-BEGIN
-	SELECT ch.schema_name, ch.table_name INTO STRICT chunk_schema_name, chunk_table_name
-	FROM _timescaledb_catalog.chunk ch
-	INNER JOIN  _timescaledb_catalog.chunk comp_ch
-	ON ch.compressed_chunk_id = comp_ch.id
-	WHERE comp_ch.schema_name = comp_ch_schema_name
-	AND comp_ch.table_name = comp_ch_table_name;
-
-    IF NOT FOUND THEN
-		RAISE USING
-			ERRCODE = 'feature_not_supported',
-			MESSAGE = 'Cannot migrate compressed chunk to version 2.16.1, chunk not found';
-    END IF;
-
-	-- Add sequence number column to compressed chunk
-	EXECUTE format('ALTER TABLE %s.%s ADD COLUMN _ts_meta_sequence_num INT DEFAULT NULL', comp_ch_schema_name, comp_ch_table_name);
-
-	-- Remove all indexes from compressed chunk
-	FOR index_name IN
-		SELECT format('%s.%s', i.schemaname, i.indexname)
-		FROM pg_indexes i
-		WHERE i.schemaname = comp_ch_schema_name
-		AND i.tablename = comp_ch_table_name
-	LOOP
-		EXECUTE format('DROP INDEX %s;', index_name);
-	END LOOP;
-
-	-- Fetch the segmentby columns from compression settings
-	SELECT string_agg(cs.segmentby_column, ',') INTO segmentby_columns
-	FROM (
-		SELECT unnest(segmentby)
-		FROM _timescaledb_catalog.compression_settings
-		WHERE relid = format('%s.%s', comp_ch_schema_name, comp_ch_table_name)::regclass::oid
-		AND segmentby IS NOT NULL
-	) AS cs(segmentby_column);
-
-	-- Create compressed chunk index based on sequence num metadata column
-	-- If there is no segmentby columns, we can skip creating the index
-    IF FOUND AND segmentby_columns IS NOT NULL THEN
-		EXECUTE format('CREATE INDEX ON %s.%s (%s, _ts_meta_sequence_num);', comp_ch_schema_name, comp_ch_table_name, segmentby_columns);
-    END IF;
-
-	-- Mark compressed chunk as unordered
-	-- Marking the chunk status bit (2) makes it unordered
-	-- and disables some optimizations. In order to re-enable
-	-- them, you need to recompress these chunks.
-	UPDATE _timescaledb_catalog.chunk
-	SET status = status | 2 -- set unordered bit
-	WHERE schema_name = chunk_schema_name
-	AND table_name = chunk_table_name;
-
-	RETURN true;
-END
-$BODY$ SET search_path TO pg_catalog, pg_temp;
-
-DO $$
-DECLARE
-	chunk_count int;
-	chunk_record record;
-BEGIN
-    -- if we find chunks which don't have sequence number metadata column in
-	-- compressed chunk, we need to stop downgrade and have the user run
-	-- a migration script to re-add the missing columns
-	SELECT count(*) INTO STRICT chunk_count
-	FROM _timescaledb_catalog.chunk ch
-	INNER JOIN _timescaledb_catalog.chunk uncomp_ch
-	ON uncomp_ch.compressed_chunk_id = ch.id
-	WHERE not exists (
-		SELECT
-		FROM pg_attribute att
-		WHERE attrelid=format('%I.%I',ch.schema_name,ch.table_name)::regclass
-		AND attname='_ts_meta_sequence_num')
-	AND NOT uncomp_ch.dropped;
-
-	-- Doing the migration if we find 10 or less chunks that need to be migrated
-	IF chunk_count > 10 THEN
-      RAISE USING
-        ERRCODE = 'feature_not_supported',
-        MESSAGE = 'Cannot downgrade compressed hypertables with chunks that do not contain sequence numbers. Run timescaledb--2.17-2.16.1.sql migration script before downgrading.',
-        DETAIL = 'Number of chunks that need to be migrated: '|| chunk_count::text;
-	ELSIF chunk_count > 0 THEN
-		FOR chunk_record IN
-		SELECT comp_ch.*
-		FROM _timescaledb_catalog.chunk ch
-		INNER JOIN _timescaledb_catalog.chunk comp_ch
-		ON ch.compressed_chunk_id = comp_ch.id
-		WHERE not exists (
-			SELECT
-			FROM pg_attribute att
-			WHERE attrelid=format('%I.%I',comp_ch.schema_name,comp_ch.table_name)::regclass
-			AND attname='_ts_meta_sequence_num')
-			AND NOT ch.dropped
-		LOOP
-			PERFORM  _timescaledb_functions.add_sequence_number_metadata_column(chunk_record.schema_name, chunk_record.table_name);
-			RAISE LOG 'Migrated compressed chunk %s.%s to version 2.16.1', chunk_record.schema_name, chunk_record.table_name;
-		END LOOP;
-
-		RAISE LOG 'Migration successful!';
-	END IF;
-END
-$$;
-
-DROP FUNCTION _timescaledb_functions.add_sequence_number_metadata_column(text, text);
-
-DROP FUNCTION _timescaledb_functions.compressed_data_info(_timescaledb_internal.compressed_data);
-DROP INDEX _timescaledb_catalog.compression_chunk_size_idx;
-DROP FUNCTION IF EXISTS _timescaledb_functions.drop_osm_chunk(REGCLASS);

version.config

@@ -1,3 +1,3 @@
-version = 2.17.0-dev
+version = 2.17.0
 update_from_version = 2.16.1
 downgrade_to_version = 2.16.1