github.com/MariaDB/server (link)

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• .github/copilot-instructions.mdvia github-copilot

  # MariaDB Server — Code Review Instructions
  
  You are reviewing a change to MariaDB Server, a large C/C++ codebase with
  strict conventions. **Correctness** comes first, but style matters too: no
  automated formatter runs on this repo, so review is the only gate that
  enforces the coding style — flag style violations as well as bugs.
  
  ## Priorities (in order)
  1. Correctness bugs and crashes (see checklist below).
  2. Backward/forward compatibility (on-disk formats, protocol, replication).
  3. Performance and 

• storage/duckdb/CLAUDE.mdvia claude-code

  # CLAUDE.md
  
  This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
  
  ## What This Is
  
  DuckDB storage engine plugin for MariaDB. Creates tables with `ENGINE=DuckDB` that store data in DuckDB's columnar format and execute analytical queries through DuckDB's vectorized engine. Lives under `storage/duckdb/` in the MariaDB server tree.
  
  ## Build
  
  ```bash
  # Build + install + start MariaDB (most common during development)
  ./build.sh -S -t Debug
  
  # CI mode (build only

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