💡 Python‑Blosc2 tip #8: push filters into `where=`.

Column reductions accept `where=` — one chunk scan, no intermediates.

Instead of:
t["temperature"][:][t["region"][:] == 3].sum()

Do:
t["temperature"].sum(where=t.region == 3)

~1.9× faster, ~7× less memory.

https://blosc.org/python-blosc2/guides/optimization_tips.html#filtered-reductions-push-the-predicate-down-with-where

Compress Better, Compute Bigger 🚀

#Python #DataScience #Blosc2