Replace references to compression with columnstore #7977

kpan2034 · 2025-04-16T21:06:15Z

No description provided.

kpan2034 · 2025-04-23T19:58:33Z

There are a few places where we refer to an "internal compressed hypertable", which is now deprecated I think. I have changed those to "columnstore hypertable". I think we can remove all references to it at some point.

svenklemm · 2025-04-25T16:34:02Z

sql/updates/latest-dev.sql

@@ -34,3 +34,5 @@ LANGUAGE C VOLATILE;

 UPDATE _timescaledb_catalog.hypertable SET chunk_sizing_func_schema = '_timescaledb_functions' WHERE chunk_sizing_func_schema = '_timescaledb_internal' AND chunk_sizing_func_name = 'calculate_chunk_interval';

+-- Rename Columnstore Policy jobs to Compression Policy
+UPDATE _timescaledb SET application_name = replace(application_name, 'Compression Policy', 'Columnstore Policy');


Suggested change

UPDATE _timescaledb SET application_name = replace(application_name, 'Compression Policy', 'Columnstore Policy');

UPDATE _timescaledb SET application_name = replace(application_name, 'Compression Policy', 'Columnstore Policy') WHERE application_name LIKE '%Compression Policy%';

svenklemm · 2025-04-25T16:35:17Z

sql/updates/reverse-dev.sql

@@ -31,3 +31,6 @@ CREATE FUNCTION @[email protected]_continuous_aggregate_policy(
 RETURNS INTEGER
 AS '@MODULE_PATHNAME@', 'ts_update_placeholder'
 LANGUAGE C VOLATILE;
+
+-- Rename Columnstore Policy jobs to Compression Policy
+UPDATE _timescaledb_config.bgw_job SET application_name = replace(application_name, 'Columnstore Policy', 'Compression Policy');


Suggested change

UPDATE _timescaledb_config.bgw_job SET application_name = replace(application_name, 'Columnstore Policy', 'Compression Policy');

UPDATE _timescaledb_config.bgw_job SET application_name = replace(application_name, 'Columnstore Policy', 'Compression Policy') WHERE application_name LIKE '%Columnstore Policy%';

codecov · 2025-04-25T22:24:20Z

Codecov Report

Attention: Patch coverage is 37.50000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 82.21%. Comparing base (59f50f2) to head (25dae2c).
Report is 1009 commits behind head on main.

Files with missing lines	Patch %	Lines
tsl/src/compression/api.c	0.00%	3 Missing and 1 partial ⚠️
tsl/src/compression/create.c	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7977      +/-   ##
==========================================
+ Coverage   80.06%   82.21%   +2.15%     
==========================================
  Files         190      252      +62     
  Lines       37181    46515    +9334     
  Branches     9450    11695    +2245     
==========================================
+ Hits        29770    38244    +8474     
- Misses       2997     3631     +634     
- Partials     4414     4640     +226

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akuzm · 2025-04-28T16:42:36Z

sql/updates/latest-dev.sql

@@ -35,3 +35,6 @@ LANGUAGE C VOLATILE;
 UPDATE _timescaledb_catalog.hypertable SET chunk_sizing_func_schema = '_timescaledb_functions' WHERE chunk_sizing_func_schema = '_timescaledb_internal' AND chunk_sizing_func_name = 'calculate_chunk_interval';

 DROP VIEW IF EXISTS timescaledb_information.hypertables;
+
+-- Rename Columnstore Policy jobs to Compression Policy
+UPDATE _timescaledb_config.bgw_job SET application_name = replace(application_name, 'Compression Policy', 'Columnstore Policy') WHERE application_name LIKE '%Compression Policy%';


Does this touch the existing user-defined jobs? I wouldn't do this not to surprise people, someone might be depending on these names in their app.

It should only touch compression policy jobs that were added, not other user-defined actions.

Replace all user-facing references to compression with columnstore. The general trend followed during the renaming is: `compression policy` -> `columnstore policy` `compression` -> `converting to columnstore` `compressed chunk` -> `columnstore chunk` `compressing 'X'` -> `converting 'X' to columnstore`

@arajkumar

## 2.20.0 (2025-05-15) This release contains performance improvements and bug fixes since the 2.19.3 release. We recommend that you upgrade at the next available opportunity. **Highlighted features in TimescaleDB v2.20.0** * The columnstore now leverages *bloom filters* to deliver up to 6x faster point queries on columns with high cardinality values, such as UUIDs. * Major *improvements to the columnstores' backfill process* enable `UPSERTS` with strict constraints to execute up to 10x faster. * *SkipScan is now supported in the columnstore*, including for DISTINCT queries. This enhancement leads to dramatic query performance improvements of 2000x to 2500x, especially for selective queries. * SIMD vectorization for the bool data type is now enabled by default. This change results in a 30–45% increase in performance for analytical queries with bool clauses on the columnstore. * *Continuous aggregates* now include experimental support for *window functions and non-immutable functions*, extending the analytics use cases they can solve. * Several quality-of-life improvements have been introduced: job names for continuous aggregates are now more descriptive, you can assign custom names to them, and it is now possible to add unique constraints along with `ADD COLUMN` operations in the columnstore. * Improved management and optimization of chunks with the ability to split large uncompressed chunks at a specified point in time using the `split_chunk` function. This new function complements the existing `merge_chunk` function that can be used to merge two small chunks into one larger chunk. * Enhancements to the default behavior of the columnstore now provide better *automatic assessments* of `segment by` and `order by` columns, reducing the need for manual configuration and simplifying initial setup. **PostgreSQL 14 support removal announcement** Following the deprecation announcement for PostgreSQL 14 in TimescaleDB v2.19.0, PostgreSQL 14 is no longer supported in TimescaleDB v2.20.0. The currently supported PostgreSQL major versions are 15, 16, and 17. **Features** * [#7638](#7638) Bloom filter sparse indexes for compressed columns. Can be disabled with the GUC `timescaledb.enable_sparse_index_bloom` * [#7756](#7756) Add warning for poor compression ratio * [#7762](#7762) Speed up the queries that use minmax sparse indexes on compressed tables by changing the index TOAST storage type to `MAIN`. This applies to newly compressed chunks * [#7785](#7785) Do `DELETE` instead of `TRUNCATE` when locks aren't acquired * [#7852](#7852) Allow creating foreign key constraints on compressed tables * [#7854](#7854) Remove support for PG14 * [#7864](#7854) Allow adding CHECK constraints to compressed chunks * [#7868](#7868) Allow adding columns with `CHECK` constraints to compressed chunks * [#7874](#7874) Support for SkipScan for distinct aggregates over the same column * [#7877](#7877) Remove blocker for unique constraints with `ADD COLUMN` * [#7878](#7878) Don't block non-immutable functions in continuous aggregates * [#7880](#7880) Add experimental support for window functions in continuous aggregates * [#7899](#7899) Vectorized decompression and filtering for boolean columns * [#7915](#7915) New option `refresh_newest_first` to continuous aggregate refresh policy API * [#7917](#7917) Remove `_timescaledb_functions.create_chunk_table` function * [#7929](#7929) Add `CREATE TABLE ... WITH` API for creating hypertables * [#7946](#7946) Add support for splitting a chunk * [#7958](#7958) Allow custom names for jobs * [#7972](#7972) Add vectorized filtering for constraint checking while backfilling into compressed chunks * [#7976](#7976) Include continuous aggregate name in jobs informational view * [#7977](#7977) Replace references to compression with columnstore * [#7981](#7981) Add columnstore as alias for `enable_columnstore `in `ALTER TABLE` * [#7983](#7983) Support for SkipScan over compressed data * [#7991](#7991) Improves default `segmentby` options * [#7992](#7992) Add API into hypertable invalidation log * [#8000](#8000) Add primary dimension info to information schema * [#8005](#8005) Support `ALTER TABLE SET (timescaledb.chunk_time_interval='1 day')` * [#8012](#8012) Add event triggers support on chunk creation * [#8014](#8014) Enable bool compression by default by setting `timescaledb.enable_bool_compression=true`. Note: for downgrading to `2.18` or earlier version, use [this downgrade script](https://github.com/timescale/timescaledb-extras/blob/master/utils/2.19.0-downgrade_new_compression_algorithms.sql) * [#8018](#8018) Add spin-lock during recompression on unique constraints * [#8026](#8026) Allow `WHERE` conditions that use nonvolatile functions to be pushed down to the compressed scan level. For example, conditions like `time > now()`, where `time` is a columnstore `orderby` column, will evaluate `now()` and use the sparse index on `time` to filter out the entire compressed batches that cannot contain matching rows. * [#8027](#8027) Add materialization invalidations API * [#8047](#8027) Support SkipScan for `SELECT DISTINCT` with multiple distincts when all but one distinct is pinned * [#8115](#8115) Add batch size limiting during compression **Bugfixes** * [#7862](#7862) Release cache pin when checking for `NOT NULL` * [#7909](#7909) Update compression stats when merging chunks * [#7928](#7928) Don't create a hypertable for implicitly published tables * [#7982](#7982) Fix crash in batch sort merge over eligible expressions * [#8008](#8008) Fix compression policy error message that shows number of successes * [#8031](#8031) Fix reporting of deleted tuples for direct batch delete * [#8033](#8033) Skip default `segmentby` if `orderby` is explicitly set * [#8061](#8061) Ensure settings for a compressed relation are found * [#7515](#7515) Add missing lock to Constraint-aware append * [#8067](#8067) Make sure hypercore TAM parent is vacuumed * [#8074](#8074) Fix memory leak in row compressor flush * [#8099](#8099) Block chunk merging on multi-dimensional hypertables * [#8106](#8106) Fix segfault when adding unique compression indexes to compressed chunks * [#8127](#8127) Read bit-packed version of booleans **GUCs** * `timescaledb.enable_sparse_index_bloom`: Enable creation of the bloom1 sparse index on compressed chunks; Default: `ON` * `timescaledb.compress_truncate_behaviour`: Defines how truncate behaves at the end of compression; Default: `truncate_only` * `timescaledb.enable_compression_ratio_warnings`: Enable warnings for poor compression ratio; Default: `ON` * `timescaledb.enable_event_triggers`: Enable event triggers for chunks creation; Default: `OFF` * `timescaledb.enable_cagg_window_functions`: Enable window functions in continuous aggregates; Default: `OFF` **Thanks** * @arajkumar for reporting that implicitly published tables were still able to create hypertables * @thotokraa for reporting an issue with unique expression indexes on compressed chunks --------- Signed-off-by: Philip Krauss <[email protected]> Signed-off-by: Ramon Guiu <[email protected]> Co-authored-by: Anastasiia Tovpeko <[email protected]> Co-authored-by: Ramon Guiu <[email protected]>

github-actions bot assigned kpan2034 Apr 16, 2025

kpan2034 force-pushed the rename-to-columnstore branch 2 times, most recently from 65d0ae0 to a66c27d Compare April 16, 2025 21:13

kpan2034 requested a review from svenklemm April 16, 2025 21:35

kpan2034 added the Compression label Apr 16, 2025

kpan2034 added this to the v2.20.0 milestone Apr 16, 2025

kpan2034 force-pushed the rename-to-columnstore branch 3 times, most recently from 4dabab3 to b859083 Compare April 23, 2025 19:53

kpan2034 force-pushed the rename-to-columnstore branch 2 times, most recently from 51b9709 to 439b060 Compare April 25, 2025 15:45

svenklemm reviewed Apr 25, 2025

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kpan2034 force-pushed the rename-to-columnstore branch 3 times, most recently from e938823 to b749fee Compare April 25, 2025 22:13

kpan2034 force-pushed the rename-to-columnstore branch from b749fee to dd25c9e Compare April 28, 2025 13:50

akuzm reviewed Apr 28, 2025

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akuzm approved these changes Apr 28, 2025

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Poroma-Banerjee approved these changes Apr 28, 2025

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kpan2034 force-pushed the rename-to-columnstore branch from dd25c9e to 25dae2c Compare April 28, 2025 18:26

kpan2034 enabled auto-merge (squash) April 28, 2025 18:26

kpan2034 merged commit 8ef4696 into timescale:main Apr 28, 2025
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kpan2034 deleted the rename-to-columnstore branch April 30, 2025 14:29

This was referenced May 7, 2025

Changelog 2.20.0 #8068

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changelog 2.20.0 #8124

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bayandin mentioned this pull request May 15, 2025

timescaledb 2.20.0 bayandin/homebrew-tap#280

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akuzm added the released-2.20.0 Released in 2.20.0 label May 16, 2025

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Replace references to compression with columnstore #7977

Replace references to compression with columnstore #7977

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kpan2034 commented Apr 16, 2025

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kpan2034 commented Apr 23, 2025

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svenklemm Apr 25, 2025

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akuzm Apr 28, 2025

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kpan2034 Apr 28, 2025

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	UPDATE _timescaledb SET application_name = replace(application_name, 'Compression Policy', 'Columnstore Policy');
	UPDATE _timescaledb SET application_name = replace(application_name, 'Compression Policy', 'Columnstore Policy') WHERE application_name LIKE '%Compression Policy%';

	UPDATE _timescaledb_config.bgw_job SET application_name = replace(application_name, 'Columnstore Policy', 'Compression Policy');
	UPDATE _timescaledb_config.bgw_job SET application_name = replace(application_name, 'Columnstore Policy', 'Compression Policy') WHERE application_name LIKE '%Columnstore Policy%';

Replace references to compression with columnstore #7977

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kpan2034 commented Apr 16, 2025

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