# TDengine ver-3.3.8.0 — 3.3.8.0

- Product: TDengine (https://whatsnew.fyi/product/tdengine)
- Vendor: taosdata
- Date: 2025-09-30
- Version: ver-3.3.8.0
- Original notes: https://github.com/taosdata/TDengine/releases/tag/ver-3.3.8.0
- Permalink: https://whatsnew.fyi/product/tdengine/releases/ver-3.3.8.0

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **added** — Add taosX performance report
- **added** — Support TLS certificate-based authentication and transmission
- **added** — Add timezone option in rust websocket connection
- **added** — Stream now supports the delete_output_table option
- **added** — State_window in stream now supports performing operations on the state column
- **added** — Stream supports the recognition of virtual table changes
- **added** — Partition by tag now supports string operations
- **added** — JDBC WebSocket support multiple endpoints for load balance
- **added** — Re-implement TSMA using the refactored stream
- **added** — Stream computing now supports notification filtering mechanism
- **added** — Support PROPHET algorithm in TDgpt
- **added** — Support Pearson correlation coefficient function
- **added** — taosX support parsing key like value in kafka
- **added** — Support for the date function
- **added** — Support functions: IF, ISNULL, ISNOTNULL, NVL, COALESCE, NULLIF, IFNULL
- **added** — Support functions: std, variance, stddev_samp, var_samp, group_concat
- **added** — Support Rollup SMA
- **added** — Support scanning the integrity of time-series data files using the scan command
- **added** — Support find_in_set, like_in_set, regexp_in_set functions
- **added** — TDgpt support imputation function
- **changed** — Support configuration of state window start and end points
- **changed** — Keep agent online by default even if taosX disconnected
- **changed** — Improve C WebSocket STMT2 performance
- **changed** — Optimize the performance of stream computing
- **changed** — Optimize db size and query speed in taosX start up
- **changed** — Notify statement in stream supports using column aliases
- **changed** — STMT2 support decimal type
- **changed** — Support BSS (Byte-Stream-Split) encoding on floating-point data
- **changed** — Optimize the Balance Vgroup Leader command to achieve a more uniform distribution of VGroup leader
- **changed** — Separate data query and metadata query processing threads
- **changed** — Update standard deviation calculation to prevent potential numeric overflow
- **changed** — Improve the efficiency of event_window queries grouped by tbname
- **fixed** — Fix out-of-bounds error in table name/Tag calculation during stream processing
- **fixed** — Fix data subscription cannot obtain the creation events of normal tables generated by stream
- **fixed** — Fix calling the forecast function on super virtual tables
- **fixed** — Fix taosX special params (sparse/realtime/stables) cause No valid epSet error
- **fixed** — Fix taosX-influxdb process not exit when task done
- **fixed** — Fix write part column is not work
- **fixed** — Fix incorrect watermark judgment when the ignore_disorder option is enabled in stream
- **fixed** — Fix RAND function returns different values even when seed is same on windows
- **fixed** — Fix the output of leastsquares is inconsistent across compilers
- **fixed** — Fix taosd crash when triggered by virtual table with tbname used as a prefilter
- **fixed** — Fix websocket connection not closed after taos_close
- **fixed** — Fix memory leak caused by STMT query errors
- **fixed** — Fix taosAdapter json serialization contains unexpected escapes
- **fixed** — Fix incorrect calculation in the first window when the FILL_HISTORY option is enabled in stream computing
- **fixed** — Fix resolved manual recalculation logic errors in stream
- **fixed** — Fix incorrect calculation results in stream when data is out-of-order or deleted
- **fixed** — Fix consumer.recv_timeout block runtime in rust connector
- **fixed** — Fix STMT2 reports error when binding empty nchar type
- **fixed** — Fix crash issue caused by commit thread suspending queries on composite primary keys of Varchar type
- **fixed** — Fix taosd crash when executing a large number of concurrent last queries
- **fixed** — Fix the cols function returns incorrect results when fetching multiple timestamps
- **fixed** — Fix TDgpt may fail during concurrent forecast
- **fixed** — Fix the issue that ss_keeplocal cannot be set to 1440m
- **fixed** — Fix poll deadline elapsed issue when timeout=never in rust taos-ws
- **fixed** — Fix no need to alert when taosX_sys not exist in TDLite
- **fixed** — Fix influxdb stopping stuck in taosX
- **fixed** — Fix influxdb multi tags with same ts would cause data lost

##### Behavior change and compatibility

##### Features
  1. feat: taosX performance report
  2. feat: support for TLS certificate-based authentication and transmission
  3. feat: add 'timezone' option in rust websocket connection
  4. feat: stream now supports the delete_output_table option
  5. feat: state_window in stream now supports performing operations on the state column
  6. feat: stream supports the recognition of virtual table changes
  7. feat: partition by tag now supports string operations
  8. feat: JDBC WebSocket support multiple endpoints for load balance
  9. feat: re-implement TSMA using the refactored stream
 10. feat: stream computing now supports notification filtering mechanism
 11. feat: support PROPHET algorithm in TDgpt
 12. feat: support Pearson correlation coefficient function
 13. feat: taosX support parsing `key` like value in kafka
 14. feat: support for the date function
 15. feat: support for functions: IF, ISNULL, ISNOTNULL, NVL, COALESCE, NULLIF, IFNULL
 16. feat: support for functions: std variance stddev_samp var_samp group_concat 
 17. feat: support Rollup SMA.
 18. feat: support scanning the integrity of time-series data files using the scan command
 19. feat: add C connector performance benchmark
 20. feat: support for find_in_set, like_in_set, regexp_in_set functions
 21. feat: JDBC reduce query times for high-efficient validation
 22. feat: TDgpt support imputation function
 23. feat: explorer report metrics to taoskeeper

##### Enhancements
  1. enh: support configuration of state window start and end points
  2. enh: keep agent online by default even if taosX disconnected
  3. enh: improve C WebSocket STMT2 performance
  4. enh: add show ssmigrate command to show the progress of shared storage migration
  5. enh: optimize the performance of stream computing.
  6. enh: add perf parameters for influxdb in Explorer-DataIn
  7. enh: taos shell supports argument values immediately following names on Windows
  8. enh: optimize db size & query speed in taosX start up
  9. enh: cache validation result to reduce license query times
 10. enh: notify statement in stream supports using column aliases
 11. enh: add cpu usage percentage of taosAdapter metric
 12. enh: taosgen add support for write TDengine with individual queues
 13. enh: explorer support contains_bad parameter in OPCDA
 14. enh: enhance error handling for subscribe error in Adapter
 15. enh: STMT2 support decimal type
 16. enh​​: support for ​​BSS (Byte-Stream-Split) encoding​​ on floating-point data
 17. enh: optimized the "Balance Vgroup Leader" command to achieve a more uniform distribution of VGroup leader
 18. enh: separate data query and metadata query processing threads
 19. enh: change default database params to vgroups=4, duration=10 in Explorer
 20. enh: support for REDISTRIBUTE command on dual-replica databases
 21. enh: update standard deviation calculation to prevent potential numeric overflow
 22. enh: show field names even though all values are null in UDT
 23. enh: allow explorer create database with replica
 24. enh: adapter recording sql csv add appName and srcPort
 25. enh: improve the efficiency of event_window queries grouped by tbname
 26. enh: alert udt error when running with rhai udt scripts in taosX

##### Fixes
  1. fix: out-of-bounds error in table name/Tag calculation during stream processing
  2. fix: data subscription cannot obtain the creation events of normal tables generated by stream
  3. fix: resolved issue where calling the forecast function on super virtual tables failed
  4. fix: taosX special params(sparse/realtime/stables) cause 'No valid epSet' error
  5. fix: taosX-influxdb process not exit when task done
  6. fix: unexpected agent activities in explorer
  7. fix: write part column is not work
  8. fix: incorrect watermark judgment when the ignore_disorder option is enabled in stream
  9. fix: RAND function returns different

_[Truncated at 4000 characters — full notes: https://github.com/taosdata/TDengine/releases/tag/ver-3.3.8.0]_