A graduate from SHAD shares insights on migrating the YQL parser from ANTLR3 to ANTLR4. This upgrade enhances autocompletion, syntax highlighting, and parser generation for Go, TypeScript, and C++. The migration involved a deep understanding of both ANTLR versions and adapting the parsing system with protobuf. Learn more about the process and nuances in the article on Habr: https://habr.com/ru/companies/yandex/articles/873464/

Interesting article! I've also worked with ANTLR3, but I'm curious to know how the migration to ANTLR4 improved performance and functionality in YQL. Would love to read more about the challenges and solutions implemented.