shoemoney commented on PR #51000:
URL: https://github.com/apache/arrow/pull/51000#issuecomment-5827041696

   Fixed the malformed-index crash in 61bef91914. For floating dictionaries 
with `nan_is_null=true`, checked `take` now runs before the dictionary validity 
lookup. Null-index payloads remain ignored, and other validity paths are 
unchanged.
   
   The expanded bounds regression terminated with SIGSEGV (exit 139) before 
this correction and passes afterward. Locally, 
`arrow-compute-scalar-utility-test --gtest_brief=1` passes all 102 tests from 
41 suites on macOS arm64 Debug. clang-format 18.1.8 and cpplint 1.6.1 also 
pass. Full Arrow CI was not run locally.


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