Test

Optimize partial shard reads #6478

Job	Run time
doctests	57s
py=3.13-upstream	18m 57s
py=3.11-min_deps	18m 23s
os=ubuntu-latest, py=3.12, deps=optional	15m 37s
os=ubuntu-latest, py=3.13, deps=minimal	16m 39s
os=ubuntu-latest, py=3.13, deps=optional	17m 57s
os=windows-latest, py=3.11, deps=optional	18m 51s
os=ubuntu-latest, py=3.11, deps=minimal	15m 49s
os=macos-latest, py=3.11, deps=optional	13m 31s
os=macos-latest, py=3.13, deps=optional	9m 54s
os=windows-latest, py=3.13, deps=optional	18m 44s
os=ubuntu-latest, py=3.12, deps=minimal	15m 44s
os=ubuntu-latest, py=3.11, deps=optional	17m 31s
Test complete	3s
	3h 18m 37s

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