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fix(indexing): avoid full-grid allocations for sparse selections - #4356

Merged

d-v-b merged 11 commits into

zarr-developers:mainfrom

d-v-b:claude/zarr-python-issue-4174-77043e

Sep 28, 2026

Merged

fix(indexing): avoid full-grid allocations for sparse selections#4356
d-v-b merged 11 commits into
zarr-developers:mainfrom
d-v-b:claude/zarr-python-issue-4174-77043e

Commits on Sep 28, 2026
- fix(indexing): make sparse selections O(npoints) instead of O(nchunks)
  d-v-b
  committed
  082ef90
- refactor(indexing): keep dense indexer attributes as deprecated properties
  d-v-b
  committed
  ee28533
- fix(indexing): exact ceildiv everywhere and sparse boolean-axis selections
  d-v-b
  committed
  a46feef
- fix(indexing): defer boolean-axis allocation changes
  d-v-b
  committed
  ffaac28
- docs: describe current ceildiv behavior
  d-v-b
  committed
  9433bae
- fix(indexing): lazily cache legacy dense attributes
  d-v-b
  committed
  3a4d51c
- fix(indexing): use a dedicated integer ceiling division helper
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  committed
  9438c3f
- refactor: remove unnecessary ceildiv re-exports
  d-v-b
  committed
  a0c14d7
- test: use Expect cases for integer ceiling division
  d-v-b
  committed
  a7d0a94
- test(indexing): restore the sparse projection property test
  d-v-b
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  848e3d5
- docs: number the changelog fragment after the merging PR
  d-v-b
  committed
  7f14b7b