parser-rewrite

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#parser-rewrite

I rewrote PostHog's SQL parser, 70x faster, while barely looking at the code

Hacker News Top ↗ · 2026-06-24 Cached

PostHog's engineer used multiple long-running Claude Code sessions to rewrite their SQL parser, achieving a 70x speedup over the previous ANTLR-based parser, while barely looking at the code themselves.

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parser-rewrite

I rewrote PostHog's SQL parser, 70x faster, while barely looking at the code

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