Xee is a new XPath and XSLT engine written in Rust, focusing on performance, security, and WebAssembly compatibility. It aims to be a modern alternative to existing engines, offering a safe and efficient way to process XML and HTML in various environments, including browsers and servers. Leveraging Rust's ownership model and memory safety features, Xee minimizes vulnerabilities like use-after-free errors and buffer overflows. Its WebAssembly support enables client-side XML processing without relying on JavaScript, potentially improving performance and security for web applications. While still under active development, Xee already supports a substantial portion of the XPath 3.1 and XSLT 3.0 specifications, with plans to implement streaming transformations and other advanced features in the future.
SQL Noir is a free, interactive tutorial that teaches SQL syntax and database concepts through a series of crime-solving puzzles. Players progress through a noir-themed storyline by writing SQL queries to interrogate witnesses, analyze clues, and ultimately identify the culprit. The game provides immediate feedback on query correctness and offers hints when needed, making it accessible to beginners while still challenging experienced users with increasingly complex scenarios. It focuses on practical application of SQL skills in a fun and engaging environment.
HN commenters generally expressed enthusiasm for SQL Noir, praising its engaging and gamified approach to learning SQL. Several noted its potential appeal to beginners and those who struggle with traditional learning methods. Some suggested improvements, such as adding more complex queries and scenarios, incorporating different SQL dialects (like PostgreSQL), and offering hints or progressive difficulty levels. A few commenters shared their positive experiences using the platform, highlighting its effectiveness in reinforcing SQL concepts. One commenter mentioned a similar project they had worked on, focusing on learning regular expressions through a detective game. The overall sentiment was positive, with many viewing SQL Noir as a valuable and innovative tool for learning SQL.
BigQuery now supports SQL pipe syntax in public preview. This feature simplifies complex queries by allowing users to chain multiple SQL statements together, passing the results of one statement as input to the next. This improves readability and maintainability, particularly for transformations involving several steps. The pipe operator, |, connects these statements, offering a more streamlined alternative to subqueries and common table expressions (CTEs). This syntax is compatible with various SQL functions and operators, enabling flexible data manipulation within the pipeline.
Hacker News users generally expressed enthusiasm for BigQuery's new pipe syntax, finding it more readable and maintainable than traditional nested queries. Several commenters compared it favorably to dplyr in R and praised its potential for simplifying complex data transformations. Some highlighted the benefits for data scientists and analysts less familiar with SQL intricacies. A few users raised questions about performance implications and debugging, while others wondered about future compatibility with other SQL dialects and the potential for integration with tools like dbt. Overall, the sentiment was positive, with many viewing the pipe syntax as a significant improvement to the BigQuery SQL experience.
Summary of Comments ( 16 )
https://news.ycombinator.com/item?id=43502291
HN commenters generally praise Xee's speed and the author's approach to error handling. Several highlight the impressive performance benchmarks compared to libxml2, with some noting the potential for Xee to become a valuable tool in performance-sensitive XML processing scenarios. Others appreciate the clean API design and Rust's memory safety advantages. A few discuss the niche nature of XPath/XSLT in modern development, while some express interest in using Xee for specific tasks like web scraping and configuration parsing. The Rust implementation also sparked discussions about language choices for performance-critical applications. Several users inquire about WASM support, indicating potential interest in browser-based applications.
The Hacker News post discussing Xee, a modern XPath and XSLT engine written in Rust, has generated several comments exploring various aspects of the project.
Several commenters express enthusiasm for the project, particularly praising its performance. One user highlights the speed improvements observed in their own testing, emphasizing the significance of a faster XSLT engine for their workflow. Another commenter points out the potential benefits of Rust's memory safety features for preventing crashes and improving the overall reliability of the engine. The choice of Rust itself is lauded, with several comments mentioning its growing popularity and suitability for tasks demanding performance and safety.
Some discussion revolves around the complexities of XPath and XSLT, acknowledging their power while also noting the steep learning curve. One commenter mentions their infrequent use of these technologies, expressing interest in revisiting them with a tool like Xee. Another points to the niche nature of XSLT, suggesting its relevance primarily within specific industries or for particular tasks like XML transformations.
A few comments delve into technical details. One user asks about the engine's handling of extensions, a crucial feature for extending the functionality of XPath and XSLT. Another inquires about the implementation of the
document()function and its behavior. The creator of Xee actively participates in the thread, responding to these technical queries and providing insights into the project's design choices and future plans. They discuss the challenges of supporting extensions and outline potential approaches for implementing them.The conversation also touches on alternative XPath and XSLT engines, with mentions of Libxml2 and Saxon. Comparisons are drawn in terms of performance and features, highlighting Xee's potential advantages in certain areas.
Overall, the comments reflect a positive reception towards Xee. Commenters express interest in its performance gains and the potential of Rust for creating robust and efficient XML processing tools. The discussion also acknowledges the complexities of XPath and XSLT, and explores technical nuances of the engine's implementation and its place within the existing ecosystem of XML processing tools.