# TDengine ver-3.4.1.0 — 3.4.1.0

- Product: TDengine (https://whatsnew.fyi/product/tdengine)
- Vendor: taosdata
- Date: 2026-04-01
- Version: ver-3.4.1.0
- Original notes: https://github.com/taosdata/TDengine/releases/tag/ver-3.4.1.0
- Permalink: https://whatsnew.fyi/product/tdengine/releases/ver-3.4.1.0

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** — MCP server for TDengine TSDB
- **added** — Support external window query with time range explicitly specified by subquery
- **added** — Support uncorrelated scalar subquery
- **added** — Support ANY/SOME/ALL/EXISTS/NOT EXISTS operators
- **added** — Support batch modification of child table tag values
- **added** — Stream adds support for scheduled calculation by natural week, month, quarter, and year dimensions
- **added** — Timeout notification function for stream when no new data is written to source child tables/virtual child tables
- **added** — Subscription function adds support for metadata changes of virtual tables
- **added** — Data subscription supports token-based login
- **added** — Identity authentication functions
- **added** — Support CAST and SUBSTR functions on BLOB type
- **added** — Support lag, lead, fill_forward function
- **added** — Fill clause of interval and interp supports surround time range
- **added** — Support scalar subqueries without the FROM clause
- **added** — Support non-correlated subqueries in IN operator
- **added** — Taosd adds support for the data repair mode
- **added** — TDgpt adds support for the multivariate anomaly detection feature
- **added** — TaosX add task owner privileges
- **added** — TaosX support system and object level privileges
- **added** — TaosX new data-in pSpace

##### Behavior change and compatibility

##### Features

  1. feat: mcp server for TDengine TSDB
  2. feat: support external window query with time range explicitly specified by subquery, suitable for complex analysis scenarios such as cross-event correlation, window reuse and hierarchical filtering
  3. feat: support uncorrelated scalar subquery
  4. feat: add support for the ANY/SOME/ALL/EXISTS/NOT EXISTS operators
  5. feat: support batch modification of child table tag values
  6. feat: stream adds support for scheduled calculation by natural week, month, quarter, and year dimensions
  7. feat: add the timeout notification function for stream when no new data is written to source child tables/virtual child tables
  8. feat: subscription function adds support for metadata changes of virtual tables
  9. feat: data subscription supports token-based login
 10. feat: add identity authentication functions
 11. enh: add support for CAST and SUBSTR functions on BLOB type
 12. feat: support the lag、lead、fill_forward function
 13. feat: the fill clause of interval and interp supports surround time range
 14. feat: support scalar subqueries without the FROM clause
 15. feat: support non-correlated subqueries in IN operator
 16. feat: taosd adds support for the data repair mode
 17. feat: TDgpt adds support for the multivariate anomaly detection feature
 18. feat: taosX add task owner privileges
 19. feat: taosX support system & object level privileges
 20. feat: taosX new data-in pSpace
 21. feat: OPC-UA connection test support failover
 22. feat: kafka transformer support filter to split messages to multiple schema
 23. feat: KingHistorian dataset auto update
 24. feat: KingHistorian support non-stop migration when end timestamp set empty
 25. feat: go websocket subscription support token auth
 26. feat: Go REST connector support TOKEN auth
 27. feat: rust subscription support token auth
 28. feat: c websocket subscription support token auth
 29. feat: taosdump now support decimal data type
 30. feat: taosdump now support BLOB data type
 31. feat: taosgen support windows
 32. feat: taosgen support setting log options in config file
 33. feat: taosKeeper add endpoint for exporting all metrics
 34. feat: Explorer support token response in login
 35. feat: explorer support totp auth
 36. feat: explorer support bearer token auth
 37. feat: support multitple brokers in MQTT task

##### Enhancements

  1. enh: taosX now works on Windows
  2. enh: add support for TDgpt functionality on the Windows platform
  3. enh: add support for stream functionality on the Windows platform
  4. enh: improve the query performance of aggregate queries with GROUP BY on virtual super tables
  5. enh: optimize the query performance of interval、session、event windows for virtual super tables
  6. enh: optimize query performance when virtual tables reference many columns of physical tables
  7. enh: optimize the query performance of state windows for virtual super tables
  8. enh: push down the time filter conditions of non-correlated subqueries to improve the batch query performance of virtual tables
  9. enh: return clear error information when virtual table creation fails, such as type matching failure of a specific column
 10. enh: add reference verification capabilities between virtual tables and source tables, including reference relationship storage, source table change verification, reference relationship query and virtual table availability verification functions
 11. enh: improve the performance of last_row queries
 12. enh: support dynamic adjustment of LRU shard count to improve the execution performance of Last queries
 13. enh: RESTORE DNODE command supports specifying VGROUP ID
 14. enh: Improve the subscription speed in the scenario of interlace writing
 15. enh: add support for the IN operator in subqueries of stream
 16. enh: add support for ANY/SOME/ALL/EXISTS/NOT EXISTS operators in

_[Truncated at 4000 characters — full notes: https://github.com/taosdata/TDengine/releases/tag/ver-3.4.1.0]_