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I rewrote PostHog's SQL parser, 70x faster, while barely looking at the code
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Overview
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.
Summary from posthog.com.
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Community reactions
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Hacker News · posthog.com
Hacker News discussion ↗
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Based on 5 sampled comments from this thread. Analyzed 2026-06-25.
- Praise: The SQL parser's performance improvement highlights the potential of AI to enhance existing technologies, showcasing how skilled developers can leverage AI tools effectively.
- Praise: The discussion around democratization of intelligence suggests that AI can evolve our understanding and creativity, similar to the impact of the internet.
- Praise: Using AI as a powerful tool in software development can streamline processes, allowing for more efficient testing and implementation strategies.
- Concern: Concerns about AI leading to a decline in individual knowledge advancement indicate a fear that reliance on AI may stifle personal growth and learning.
- Concern: Skepticism about the originality of AI-generated solutions suggests that many believe existing knowledge and techniques are being overshadowed by AI's capabilities.