[yuyi13]

Daily native preparation read multi-year source chunks one day at a time through a small default cache, repeatedly decompressing the same spatial chunk slab. Apply the bounded per-variable cache to the actual NetCDF handle used by xarray. Preserve CF decoding and the existing daily reprojection, close handles on exit, and leave global defaults unchanged.

Validation:

• Gadi job 181482217 passed 392 tests, package builds, the offline paired workflow and the installed-wheel demo.
• A real 31-day comparison preserved values and metadata exactly: 26.45 seconds with the original reader versus 1.32 seconds with the cache.
• Preparing one native 167 × 167 component across all 5,844 days took 62.35 seconds; peak parent memory was 2.24 GiB.
• Tests cover packed values, missing values, classic NetCDF, selected-variable caches, unchanged global defaults and handle closure on success and failure.

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-17T17:34:22.241345Z	4e6693e	PR opened

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