Reuse existing dimension_slice ids when possible - #10257
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When upgrading to 2.28.x we would rebuild all dimension_slices as slices can no longer be shared. We can completely reuse existing ids for hypertables with only single dimensions and reduce the amount of renumbering for hypertables with multiple dimensions. This reduces the amount of locks takes during extension upgrades.
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# TimescaleDB Changelog **Please note: When updating your database, you should connect using `psql` with the `-X` flag to prevent any `.psqlrc` commands from accidentally triggering the load of a previous TimescaleDB version.** ## 2.28.3 (2026-07-16) This release contains performance improvements and bug fixes since the 2.28.2 release. We recommend that you upgrade at the next available opportunity. **Bugfixes** * [#10082](#10082) Wrong result when evaluating a function returning `NULL` in the columnar query execution pipeline * [#10178](#10178) Fix incorrect usage of sort transformation for sort key expressions with negative constants * [#10179](#10179) Allow enabling and disabling triggers on hypertables with columnstore enabled * [#10182](#10182) Fix columnstore sort pushdown to check for different query sort key collation * [#10209](#10209) Fix potentially wrong results for `stddev(float4)` and `stddev(float8)` when used with `avg()` in the columnar query execution pipeline * [#10212](#10212) Fix race condition when enabling compression on a hypertable * [#10230](#10230) Batch filtering for compressed `DML` should respect collation * [#10254](#10254) Direct delete failed to handle array predicates with `NULL` values and deleted more rows than intended ([#10129](#10129)) * [#10257](#10257) Reuse existing `dimension_slice` IDs when possible * [#10265](#10265) Truncate constraint name before trying to rename **Thanks** * @juantxorena for reporting that triggers could not be enabled or disabled on hypertables with columnstore enabled
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When upgrading to 2.28.x we would rebuild all dimension_slices as
slices can no longer be shared. We can completely reuse existing
ids for hypertables with only single dimensions and reduce the
amount of renumbering for hypertables with multiple dimensions.
This reduces the amount of locks takes during extension upgrades.