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Add index to compression_chunk_size catalog table #7227

Merged
merged 1 commit into from
Sep 4, 2024
Merged

Add index to compression_chunk_size catalog table #7227

merged 1 commit into from
Sep 4, 2024

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mkindahl
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@mkindahl mkindahl commented Sep 2, 2024

During upgrade the function remove_dropped_chunk_metadata is used to update the metadata tables and remove data for chunks marked as dropped. The function iterates of the chunks of the provided hypertable and internally does a sequence scan of compression_chunk_size table to locate the compressed_chunk_id, resulting in quadratic execution time. This is usually not noticed for small number of chunks, but for large number of chunks this becomes a problem.

This commit fixes this by adding an index to compression_chunk_size catalog table, turning the sequence scan into an index scan.

@mkindahl
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mkindahl commented Sep 2, 2024

An alternative would be to rewrite the delete statements to join it with the select statement that drives the for-loop in remove_dropped_chunk_metadata. However, this is a lot more work for a small benefit, so hence this patch.

@mkindahl
Add index to compression_chunk_size catalog table
576ddc8 
During upgrade the function `remove_dropped_chunk_metadata` is used to
update the metadata tables and remove data for chunks marked as
dropped. The function iterates of the chunks of the provided hypertable
and internally does a sequence scan of `compression_chunk_size` table
to locate the `compressed_chunk_id`, resulting in quadratic execution
time. This is usually not noticed for small number of chunks, but for
large number of chunks this becomes a problem.

This commit fixes this by adding an index to `compression_chunk_size`
catalog table, turning the sequence scan into an index scan.
@mkindahl mkindahl force-pushed the add-compression-chunk-size-index branch from 547050d to 576ddc8 Compare September 2, 2024 11:57
@mkindahl mkindahl self-assigned this Sep 2, 2024
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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.81%. Comparing base (59f50f2) to head (576ddc8).
Report is 305 commits behind head on main.

Additional details and impacted files 
@@            Coverage Diff             @@
##             main    #7227      +/-   ##
==========================================
+ Coverage   80.06%   81.81%   +1.74%     
==========================================
  Files         190      205      +15     
  Lines       37181    38320    +1139     
  Branches     9450     9936     +486     
==========================================
+ Hits        29770    31350    +1580     
+ Misses       2997     2974      -23     
+ Partials     4414     3996     -418

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@mkindahl mkindahl merged commit e1eeedb into timescale:main Sep 4, 2024
37 of 38 checks passed
@mkindahl mkindahl deleted the add-compression-chunk-size-index branch September 4, 2024 08:28
pallavisontakke added a commit to pallavisontakke/timescaledb that referenced this pull request Sep 20, 2024
@pallavisontakke
## 2.17.0
c2ed0d4 
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#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.

**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

**Thanks**
* @MiguelTubio for reporting and fixing a Windows build error
* @posuch for reporting the misleading extension description in the generic loader packages.
@pallavisontakke pallavisontakke mentioned this pull request Sep 20, 2024
Merged
pallavisontakke added a commit to pallavisontakke/timescaledb that referenced this pull request Sep 25, 2024
@pallavisontakke
## 2.17.0
32c11a3 
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#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.

**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

**Thanks**
* @MiguelTubio for reporting and fixing a Windows build error
* @posuch for reporting the misleading extension description in the generic loader packages.
pallavisontakke added a commit to pallavisontakke/timescaledb that referenced this pull request Sep 26, 2024
@pallavisontakke
## 2.17.0
64822f6 
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#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.

**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

**Thanks**
* @MiguelTubio for reporting and fixing a Windows build error
* @posuch for reporting the misleading extension description in the generic loader packages.
pallavisontakke added a commit to pallavisontakke/timescaledb that referenced this pull request Sep 30, 2024
@pallavisontakke
## 2.17.0
f8da382 
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#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.

**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

**Thanks**
* @MiguelTubio for reporting and fixing a Windows build error
* @posuch for reporting the misleading extension description in the generic loader packages.
pallavisontakke added a commit to pallavisontakke/timescaledb that referenced this pull request Oct 8, 2024
@pallavisontakke
## 2.17.0
a0ef1a6 
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
@pallavisontakke pallavisontakke mentioned this pull request Oct 8, 2024
Merged
pallavisontakke added a commit that referenced this pull request Oct 8, 2024
@pallavisontakke
Release 2.17.0
43ef9b7 
This release adds support for PostgreSQL 17, significantly improves the
performance of continuous aggregate refreshes,
and contains performance improvements for analytical queries and delete
operations over compressed hypertables.
We recommend that you upgrade at the next available opportunity.

**Highlighted features in TimescaleDB v2.17.0**

* Full PostgreSQL 17 support for all existing features. TimescaleDB
v2.17 is available for PostgreSQL 14, 15, 16, and 17.

* Significant performance improvements for continuous aggregate
policies: continuous aggregate refresh is now using
`merge` instead of deleting old materialized data and re-inserting.

This update can decrease dramatically the amount of data that must be
written on the continuous aggregate in the
presence of a small number of changes, reduce the `i/o` cost of
refreshing a continuous aggregate, and generate fewer
  Write-Ahead Logs (`WAL`).
Overall, continuous aggregate policies will be more lightweight, use
less system resources, and complete faster.

* Increased performance for real-time analytical queries over compressed
hypertables:
we are excited to introduce additional Single Instruction, Multiple Data
(`SIMD`) vectorization optimization to our
engine by supporting vectorized execution for queries that group by
using the `segment_by` column(s) and
aggregate using the basic aggregate functions (`sum`, `count`, `avg`,
`min`, `max`).

Stay tuned for more to come in follow-up releases! Support for grouping
on additional columns, filtered aggregation,
  vectorized expressions, and `time_bucket` is coming soon.

* Improved performance of deletes on compressed hypertables when a large
amount of data is affected.

This improvement speeds up operations that delete whole segments by
skipping the decompression step.
It is enabled for all deletes that filter by the `segment_by` column(s).

**PostgreSQL 14 deprecation announcement**

We will continue supporting PostgreSQL 14 until April 2025. Closer to
that time, we will announce the specific
version of TimescaleDB in which PostgreSQL 14 support will not be
included going forward.

**Features**
* #6882: Allow delete of full segments on compressed chunks without
decompression.
* #7033: Use `merge` statement on continuous aggregates refresh.
* #7126: Add functions to show the compression information.
* #7147: Vectorize partial aggregation for `sum(int4)` with grouping on
`segment by` columns.
* #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 the `returning` clause for `merge`.
* #7200: Vectorize common aggregate functions like `min`, `max`, `sum`,
`avg`, `stddev`, `variance` for compressed columns
of arithmetic types, when there is grouping on `segment by` columns or
no grouping.

**Bug fixes**
* #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 the unexpected building errors.
* #7270: Fix the memory leak in compressed DML batch filtering.
* #7286: Fix the index column check while searching for the index.
* #7290: Add check for null offset for continuous aggregates built on
top of continuous aggregates.
* #7301: Make foreign key behavior for hypertables consistent.
* #7318: Fix chunk skipping range filtering.
* #7320: Set the license specific extension comment in the install
script.

**Thanks**
* @MiguelTubio for reporting and fixing the Windows build error.
* @posuch for reporting the misleading extension description in the
generic loader packages.
* @snyrkill for discovering and reporting the issue with continuous
aggregates built on top of continuous aggregates.
svenklemm added a commit that referenced this pull request Oct 8, 2024
@pallavisontakke @iroussos
@atovpeko @svenklemm
Release 2.17.0
5858892 
This release adds support for PostgreSQL 17, significantly improves the
performance of continuous aggregate refreshes,
and contains performance improvements for analytical queries and delete
operations over compressed hypertables.
We recommend that you upgrade at the next available opportunity.

**Highlighted features in TimescaleDB v2.17.0**

* Full PostgreSQL 17 support for all existing features. TimescaleDB
v2.17 is available for PostgreSQL 14, 15, 16, and 17.

* Significant performance improvements for continuous aggregate
policies: continuous aggregate refresh is now using
`merge` instead of deleting old materialized data and re-inserting.

This update can decrease dramatically the amount of data that must be
written on the continuous aggregate in the
presence of a small number of changes, reduce the `i/o` cost of
refreshing a continuous aggregate, and generate fewer
  Write-Ahead Logs (`WAL`).
Overall, continuous aggregate policies will be more lightweight, use
less system resources, and complete faster.

* Increased performance for real-time analytical queries over compressed
hypertables:
we are excited to introduce additional Single Instruction, Multiple Data
(`SIMD`) vectorization optimization to our
engine by supporting vectorized execution for queries that group by
using the `segment_by` column(s) and
aggregate using the basic aggregate functions (`sum`, `count`, `avg`,
`min`, `max`).

Stay tuned for more to come in follow-up releases! Support for grouping
on additional columns, filtered aggregation,
  vectorized expressions, and `time_bucket` is coming soon.

* Improved performance of deletes on compressed hypertables when a large
amount of data is affected.

This improvement speeds up operations that delete whole segments by
skipping the decompression step.
It is enabled for all deletes that filter by the `segment_by` column(s).

**PostgreSQL 14 deprecation announcement**

We will continue supporting PostgreSQL 14 until April 2025. Closer to
that time, we will announce the specific
version of TimescaleDB in which PostgreSQL 14 support will not be
included going forward.

**Features**
* #6882: Allow delete of full segments on compressed chunks without
decompression.
* #7033: Use `merge` statement on continuous aggregates refresh.
* #7126: Add functions to show the compression information.
* #7147: Vectorize partial aggregation for `sum(int4)` with grouping on
`segment by` columns.
* #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 the `returning` clause for `merge`.
* #7200: Vectorize common aggregate functions like `min`, `max`, `sum`,
`avg`, `stddev`, `variance` for compressed columns
of arithmetic types, when there is grouping on `segment by` columns or
no grouping.

**Bug fixes**
* #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 the unexpected building errors.
* #7270: Fix the memory leak in compressed DML batch filtering.
* #7286: Fix the index column check while searching for the index.
* #7290: Add check for null offset for continuous aggregates built on
top of continuous aggregates.
* #7301: Make foreign key behavior for hypertables consistent.
* #7318: Fix chunk skipping range filtering.
* #7320: Set the license specific extension comment in the install
script.

**Thanks**
* @MiguelTubio for reporting and fixing the Windows build error.
* @posuch for reporting the misleading extension description in the generic loader packages.
* @snyrkill for discovering and reporting the issue with continuous
aggregates built on top of continuous aggregates.

---------

Signed-off-by: Pallavi Sontakke <pallavi@timescale.com>
Signed-off-by: Yannis Roussos <iroussos@gmail.com>
Signed-off-by: Sven Klemm <31455525+svenklemm@users.noreply.github.com>
Co-authored-by: Yannis Roussos <iroussos@gmail.com>
Co-authored-by: atovpeko <114177030+atovpeko@users.noreply.github.com>
Co-authored-by: Sven Klemm <31455525+svenklemm@users.noreply.github.com>
kpan2034 pushed a commit to kpan2034/timescaledb that referenced this pull request Oct 11, 2024
@pallavisontakke @iroussos
@atovpeko @svenklemm @kpan2034
Release 2.17.0
546b39b 
This release adds support for PostgreSQL 17, significantly improves the
performance of continuous aggregate refreshes,
and contains performance improvements for analytical queries and delete
operations over compressed hypertables.
We recommend that you upgrade at the next available opportunity.

**Highlighted features in TimescaleDB v2.17.0**

* Full PostgreSQL 17 support for all existing features. TimescaleDB
v2.17 is available for PostgreSQL 14, 15, 16, and 17.

* Significant performance improvements for continuous aggregate
policies: continuous aggregate refresh is now using
`merge` instead of deleting old materialized data and re-inserting.

This update can decrease dramatically the amount of data that must be
written on the continuous aggregate in the
presence of a small number of changes, reduce the `i/o` cost of
refreshing a continuous aggregate, and generate fewer
  Write-Ahead Logs (`WAL`).
Overall, continuous aggregate policies will be more lightweight, use
less system resources, and complete faster.

* Increased performance for real-time analytical queries over compressed
hypertables:
we are excited to introduce additional Single Instruction, Multiple Data
(`SIMD`) vectorization optimization to our
engine by supporting vectorized execution for queries that group by
using the `segment_by` column(s) and
aggregate using the basic aggregate functions (`sum`, `count`, `avg`,
`min`, `max`).

Stay tuned for more to come in follow-up releases! Support for grouping
on additional columns, filtered aggregation,
  vectorized expressions, and `time_bucket` is coming soon.

* Improved performance of deletes on compressed hypertables when a large
amount of data is affected.

This improvement speeds up operations that delete whole segments by
skipping the decompression step.
It is enabled for all deletes that filter by the `segment_by` column(s).

**PostgreSQL 14 deprecation announcement**

We will continue supporting PostgreSQL 14 until April 2025. Closer to
that time, we will announce the specific
version of TimescaleDB in which PostgreSQL 14 support will not be
included going forward.

**Features**
* timescale#6882: Allow delete of full segments on compressed chunks without
decompression.
* timescale#7033: Use `merge` statement on continuous aggregates refresh.
* timescale#7126: Add functions to show the compression information.
* timescale#7147: Vectorize partial aggregation for `sum(int4)` with grouping on
`segment by` columns.
* 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 the `returning` clause for `merge`.
* timescale#7200: Vectorize common aggregate functions like `min`, `max`, `sum`,
`avg`, `stddev`, `variance` for compressed columns
of arithmetic types, when there is grouping on `segment by` columns or
no grouping.

**Bug fixes**
* 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 the unexpected building errors.
* timescale#7270: Fix the memory leak in compressed DML batch filtering.
* timescale#7286: Fix the index column check while searching for the index.
* timescale#7290: Add check for null offset for continuous aggregates built on
top of continuous aggregates.
* timescale#7301: Make foreign key behavior for hypertables consistent.
* timescale#7318: Fix chunk skipping range filtering.
* timescale#7320: Set the license specific extension comment in the install
script.

**Thanks**
* @MiguelTubio for reporting and fixing the Windows build error.
* @posuch for reporting the misleading extension description in the generic loader packages.
* @snyrkill for discovering and reporting the issue with continuous
aggregates built on top of continuous aggregates.

---------

Signed-off-by: Pallavi Sontakke <pallavi@timescale.com>
Signed-off-by: Yannis Roussos <iroussos@gmail.com>
Signed-off-by: Sven Klemm <31455525+svenklemm@users.noreply.github.com>
Co-authored-by: Yannis Roussos <iroussos@gmail.com>
Co-authored-by: atovpeko <114177030+atovpeko@users.noreply.github.com>
Co-authored-by: Sven Klemm <31455525+svenklemm@users.noreply.github.com>
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@akuzm akuzm akuzm approved these changes

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@mkindahl @fabriziomello @akuzm