Coalesce and parallelize partial shard reads#3004

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aldenks wants to merge 29 commits intozarr-developers:mainfrom

aldenks:coalesce-shard-reads

Commits on Jul 21, 2025

Fix and test for case where some chunks in shard are all fill
aldenks
committed

Commits on Aug 6, 2025

Merge branch 'main' into coalesce-shard-reads
d-v-b
authored

Commits on Jan 26, 2026

Merge branch 'main' into coalesce-shard-reads
aldenks
authored

Commits on Feb 2, 2026

Only use concurrent_map over chunks within a shard if > 1 groups after coalescing
aldenks
committed
no-op test change to retry CI after unavailable runner failure
aldenks
committed

Commits on Feb 3, 2026

Another no-op test change to retry CI after unavailable runner failure
aldenks
committed