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Behavior change and compatibility

Features

  1. feat: adapter add connector info attribute in ws connection
  2. feat: C websocket support ssl/tls connection params
  3. feat: support taosAdapter instances register and query
  4. feat: parse and write any JSON data to database
  5. feat: add rust connector benchmark tool
  6. feat: support taosX high-availability and Kafka task load balancing
  7. feat: TDgpt supports row correlation analysis functions such as dtw, dtw_path and tlcc
  8. feat: data transmission supports SASL mechanism and resource control [Enterprise Edition]
  9. feat: data storage supports full transparent encryption [Enterprise Edition]
  10. feat: support multi-factor authentication (MFA) and multiple login security policies [Enterprise Edition]
  11. feat: support RBAC-based permission architecture [Enterprise Edition]
  12. feat: support hierarchical auditing and permission control [Enterprise Edition]
  13. feat: Support SM4_ENCRYPT, SM4_DECRYPT, AES_ENCRYPT, AES_DECRYPT, MD5, SHA, SHA1, SHA2, MASK_FULL, MASK_PARTIAL, MASK_NONE, FROM_BASE64 and TO_BASE64 functions
  14. feat: event window triggering of stream supports sub-event windows
  15. feat: Explorer add support for OAuth 2.0 and OIDC SSO
  16. feat: taosAdapter support customized SQL rejection rules
  17. feat: add identity authentication functions

Enhancements

  1. enh: increase the maximum number of columns supported by virtual tables to 32767
  2. enh: prohibit sorting by aggregate functions in non-aggregate queries
  3. enh: state windows now support specifying a "zero state" via zeroth_state, skipping computation and output for windows in this state.
  4. enh: optimize the error message when taosc initialization fails due to insufficient write permissions for the log file directory
  5. enh: stream now supports interp and percentile functions
  6. enh: reduce resource consumption of trigger data and computation data reading in stream computing
  7. enh: prohibit the use of duplicate timestamps in state_window, count_window and event_window on super tables
  8. enh: improved the exit handling logic of taosmqtt to achieve a more graceful shutdown and resource release
  9. enh: set the global timezone to reduce lock contention related to time conversion during concurrent queries and writes
  10. enh: window query do not require mandatory aggregate functions, support including only pseudo-columns like _wstart and tbname
  11. enh: Linux tar package supports non-root installation of TDengine TSDB with custom install path
  12. enh: after modifying tag columns, support data subscription to take effect without reconstruction by executing the RELOAD TOPIC command
  13. enh: support recording operations such as query and deletion in audit logs
  14. enh: add the client version number field to the show connections command.
  15. enh: add status and note fields to the ins_anodes_full table for real-time feedback on model and algorithm status
  16. enh: add two Hints parameters (WIN_OPTIMIZE_BATCH and WIN_OPTIMIZE_SINGLE) to improve the state window query performance of virtual tables
  17. enh: support encryption algorithm management [Enterprise Edition]
  18. enh: add clock check mechanism for communication between clusters
  19. enh: add support for virtual table queries in stmt2
  20. enh: compact command now support the force option
  21. enh: improve the query performance of aggregate and selection functions for virtual super tables
  22. enh: support for user login failure policies
  23. enh: optimize OPC-DA collection and auto-reconnection
  24. enh: execution plan supports displaying tag indexes
  25. enh: add the 'is_ready' column to the show vgroups command
  26. enh: add bool type validation during stmt2 writing
  27. enh: adjust the logs of stmt2 to facilitate problem troubleshooting
  28. enh: event window of stream generates window opening notifications only when the true_for condition is met
  29. enh: optimize the usage logic of read-write locks in RPC communication
  30. enh: return immediately when updating sub-table tags if the tag value remains unchanged, avoiding frequent updates to the sub-table set of data subscriptions

Fixes

  1. fix: the latest WAL version number was not used when stream triggered data recalculation, resulting in incorrect calculation results
  2. fix: query error when col in order by abs(col) exists in result set instead of table
  3. fix: the results of show create table and SELECT distinct tbname, json_tag_name are not as expected when the TAG column is of JSON type
  4. fix: when parsing the output table tag name in the stream creation statement, the backtick (`) was mistakenly taken as part of the column name, which did not match the column name of the table created manually via SQL, resulting in the "Ou
  5. fix: resolve incorrect query results when subqueries in nested queries use descending sorting, no sorting, or sorting by non-time primary key
  6. tix: concurrency issue caused by modifying tdb while data subscription is in progress
  7. fix: OPCUA download data points not work when edit
  8. fix: support import alert dashboard for Grafana 12.x
  9. fix: the cache_load field of ins_vgroups is displayed as a negative value when it exceeds the maximum value of int32
  10. fix: potential crash risks during query memory control
  11. fix: stream fails to calculate historical data when using FILL_HISTORY
  12. fx: stream errors when reading data cause subsequent computing tasks to wait
  13. fix: no longer require sorting when the time primary key of sub-tables in JOIN syntax is a constant
  14. fix: Kafka extract/split with depth error
  15. fix: schema and tag synchronization issue when the stream result table already exists
  16. fix: resolve the issue of failed rawdata data subscription
  17. fix: Explorer upload monitor to taoskeeper by default
  18. fix: crash caused by excessively long table names during STMT2 automatic table creation on write
  19. fix: "Invalid value in client" error is triggered when querying virtual super tables
  20. fix: KingHistorian subscription not work
  21. fix: incorrect tbname processing logic when writing data via the insert into stable syntax
  22. fix: the issue of probabilistic failure when stream sends event notifications via WebSocket
  23. fix: taosX req_id can't find in other components
  24. fix: node.js support no timezone on window
  25. fix: Explorer login error without subpath
  26. fix: transactions cannot end when modifying global variables
  27. fix: fix latency issue in opc-ua
  28. fix: logic error caused by columns of multiple virtual tables using the same original table column
  29. fix: taosAdapter crash caused by callback function not being called after stmt query returns
  30. fix: taosX my cause sql too long with 100k message per row
  31. fix: data is written to an incorrect dnode and triggers the "Vnode is closed" error when executing insert into select statements
  32. fix: coredump occurs when the join query in stream subquery contains the tag==%%n condition
  33. fix: unexpected split result in transform
  34. fix: field_type error in c ws taos_stmt2_get_fields
  35. fix: incorrect data source was invoked when using anomaly detection in stream
  36. fix: the issue that query processes get stuck when both dbname and tbname are set to ? in query statements executed via stmt2
  37. fix: InfluxDB no tag measurements data in error
  38. fix: errors occurring when modifying the internal table structure concurrently during schemaless writing
  39. fix: incorrect results when querying with state window and partition by
  40. fix: errors in the outer cols function of nested queries
  41. fix: AVEVA Historian data in configration error
  42. fix: resolve the crash issue when querying virtual tables that reference data columns of the same name but different types in sub-tables
  43. fix: abnormal data loading issue when upgrading from version 3.3.6.32-3.3.6.36 to 3.3.8.6-3.3.8.10
  44. fix: crash occurs occasionally during disk flushing for decimal-type data with NULL values when caching is enabled
  45. fix: client cannot perceive table schema modifications made by other clients
  46. fix: PI/PI-Backfill ingestion error with period sign
  47. fix: fix not found model in dsn error while creating pi tasks
  48. fix: fix taosgen coredump in case of inccorect csv format
  49. fix: crash occurs when stream triggers table creation without carrying written data

What's Changed

New Contributors

Full Changelog: https://github.com/taosdata/TDengine/compare/ver-3.3.8.8...ver-3.4.0.0

Source: README.md, updated 2026-01-02