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This release contains performance improvements and bug fixes since the 2.14.2 release. We recommend that you upgrade at the next available opportunity. In addition, it includes these noteworthy features: * Support `time_bucket` with `origin` and/or `offset` on Continuous Aggregate * Compression improvements: - Improve expression pushdown - Add minmax sparse indexes when compressing columns with btree indexes - Make compression use the defaults functions - Vectorize filters in WHERE clause that contain text equality operators and LIKE expressions **Deprecation warning** * Starting on this release will not be possible to create Continuous Aggregate using `time_bucket_ng` anymore and it will be completely removed on the upcoming releases. * Recommend users to [migrate their old Continuous Aggregate format to the new one](https://docs.timescale.com/use-timescale/latest/continuous-aggregates/migrate/) because it support will be completely removed in next releases prevent them to migrate. * This is the last release supporting PostgreSQL 13. **For on-premise users and this release only**, you will need to run [this SQL script](https://github.com/timescale/timescaledb-extras/blob/master/utils/2.15.X-fix_hypertable_foreign_keys.sql) after running `ALTER EXTENSION`. More details can be found in the pull request [#6786](https://github.com/timescale/timescaledb/pull/6797). **Features** * #6382 Support for time_bucket with origin and offset in CAggs * #6696 Improve defaults for compression segment_by and order_by * #6705 Add sparse minmax indexes for compressed columns that have uncompressed btree indexes * #6754 Allow DROP CONSTRAINT on compressed hypertables * #6767 Add metadata table `_timestaledb_internal.bgw_job_stat_history` for tracking job execution history * #6798 Prevent usage of deprecated time_bucket_ng in CAgg definition * #6810 Add telemetry for access methods * #6811 Remove no longer relevant timescaledb.allow_install_without_preload GUC * #6837 Add migration path for CAggs using time_bucket_ng * #6865 Update the watermark when truncating a CAgg **Bugfixes** * #6617 Fix error in show_chunks * #6621 Remove metadata when dropping chunks * #6677 Fix snapshot usage in CAgg invalidation scanner * #6698 Define meaning of 0 retries for jobs as no retries * #6717 Fix handling of compressed tables with primary or unique index in COPY path * #6726 Fix constify cagg_watermark using window function when querying a CAgg * #6729 Fix NULL start value handling in CAgg refresh * #6732 Fix CAgg migration with custom timezone / date format settings * #6752 Remove custom autovacuum setting from compressed chunks * #6770 Fix plantime chunk exclusion for OSM chunk * #6789 Fix deletes with subqueries and compression * #6796 Fix a crash involving a view on a hypertable * #6797 Fix foreign key constraint handling on compressed hypertables * #6816 Fix handling of chunks with no contraints * #6820 Fix a crash when the ts_hypertable_insert_blocker was called directly * #6849 Use non-orderby compressed metadata in compressed DML * #6867 Clean up compression settings when deleting compressed cagg * #6869 Fix compressed DML with constraints of form value OP column * #6870 Fix bool expression pushdown for queries on compressed chunks **Thanks** * @brasic for reporting a crash when the ts_hypertable_insert_blocker was called directly * @bvanelli for reporting an issue with the jobs retry count * @djzurawsk For reporting error when dropping chunks * @Dzuzepppe for reporting an issue with DELETEs using subquery on compressed chunk working incorrectly. * @hongquan For reporting a 'timestamp out of range' error during CAgg migrations * @kevcenteno for reporting an issue with the show_chunks API showing incorrect output when 'created_before/created_after' was used with time-partitioned columns. * @mahipv For starting working on the job history PR * @rovo89 For reporting constify cagg_watermark not working using window function when querying a CAgg
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