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I rewrote PostHog's SQL parser, 70x faster, while barely looking at the code
tool
9 min read
PostHog's SQL parser was rewritten using multiple long-running Claude Code sessions in parallel, resulting in a 70x speed increase. The new parser consists of 16,000 lines of code, 5,000 lines of tooling, and additional test code, maintaining equivalence to the previous parser for all realistic queries.