JingsongLi commented on PR #10147:
URL: https://github.com/apache/paimon/pull/10147#issuecomment-5805518033
Requirement fit: SUPPORTED. Selected-key projection is a caller-visible read
path, and the reported full-reader measurements show a substantial improvement
for ordinary MAP storage without changing complete-MAP reads.
Implementation: CLEAN in the changed path. I traced the caller's string key
selection and checked first-match behavior for duplicate keys, null first
values, null parent MAPs, sliced arrays, nested/extension values, and the
PyArrow fallback. I found no actionable regression.
Verification on an isolated checkout (PyArrow 24): the new tests,
selected-key projection tests, and related shared-shredding reader tests passed
with ORC excluded (31 passed, 45 subtests). ORC tests are blocked locally by
PyArrow's sysctlbyname('hw.l1dcachesize') error. The benchmark predates the
exact final cleanup, so current-head performance evidence would be useful
before release.
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