pitrou opened a new pull request, #49806:
URL: https://github.com/apache/arrow/pull/49806

   ### Rationale for this change
   
   DeltaBitPackDecoder::DecodeArrow allocates a temporary std::vector for the 
entire range of decoded values. This is sub-optimal, and generates 
out-of-memory failures in the Parquet encoding fuzzer.
   
   This issue was found by OSS-Fuzz: 
https://issues.oss-fuzz.com/issues/489941774
   
   ### What changes are included in this PR?
   
   We should instead use a fixed-size temporary buffer.
   
   ### Are these changes tested?
   
   Yes, by existing CI tests.
   
   ### Are there any user-facing changes?
   
   No.
   


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