merge: from main to 3.0 branch

[guanshengliang]

Description

Please briefly describe the code changes in this pull request.

Checklist

Please check the items in the checklist if applicable.

• Is the user manual updated?
• Are the test cases passed and automated?
• Is there no significant decrease in test coverage?

[gemini-code-assist]

Summary of Changes

Hello @guanshengliang, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request integrates the latest changes from the main branch into the 3.0 branch, marking a new alpha release version 3.3.8.1. The update encompasses a range of improvements from core versioning and documentation updates to critical bug fixes and system stability enhancements. It also includes significant refactoring of test utilities to streamline development and ensure robust functionality.

Highlights

• Version Update: The core version of the project has been updated from 3.3.8.0.alpha to 3.3.8.1.alpha across the codebase and documentation.
• Documentation Enhancements: Various documentation files, including installation guides (English and Chinese), Python connector details, TDgpt tutorials, and RSMA (Rollup SMA) usage, have been updated to reflect the new version and include new features like load balancing support for the WebSocket Connector and detailed RSMA task management commands (show retentions, kill retention).
• Stream Processing Improvements: Introduced a lowLatencyCalc option for stream tasks and a configurable streamBatchRequestWaitMs parameter to fine-tune stream processing behavior. Thread-safety has also been enhanced for stream status resets.
• Error Handling and Logging: Improved error messages during mnode startup and implemented a mechanism to rotate mnode endpoint sets upon status request timeouts, enhancing system resilience. An error code for invalid retention IDs was also renamed for clarity.
• Data Object Refinements: The dbUid (database unique identifier) has been added to SCompactObj and SScanObj structs, and related functions have been updated to use this for more precise database identification in compaction and scan operations.
• Test Infrastructure Refactoring: Numerous Python test scripts have been refactored to centralize the retrieval of build paths, improving maintainability. New test cases have been added for last and last_row aggregate functions, specifically testing their behavior with tag and primary key columns.
• Bug Fixes: A new release notes file for version 3.3.8.1 details several fixes, addressing issues such as incorrect results from first/last functions on timestamp columns, stream calculation errors after restarts, perf_connections information inaccuracies, decimal data precision loss, Windows timezone display issues, stream DELETE_RECALC option handling, Explorer typos, move_to failures, WebSocket reconnection crashes, disk flush thread deadlocks, and ineffective tag filtering in subscriptions.

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[gemini-code-assist]

Code Review

This pull request merges changes from the main branch into the 3.0 release branch, primarily for the 3.3.8.1 release. The changes include version bumps across various files, documentation updates with release notes and feature explanations, and several important bug fixes and enhancements. Notable improvements include corrections in data parsing within taosBenchmark by using appropriate string-to-number conversion functions, a security fix in cJson to prevent buffer overflows, and enhancements to stream processing for low-latency calculations. Additionally, many Python test files have been refactored to improve code reuse, and error handling has been made more robust in several C components. Overall, the changes are beneficial for the stability and correctness of the codebase.