dimakuz opened a new pull request, #710: URL: https://github.com/apache/arrow-go/pull/710
…imal256 bigEndianToDecimal256 in column_readers.go has a bug in the partial-word sign extension path: it shifts by wordLen (byte count) instead of wordLen*8 (bit count). This is a copy-paste error from bigEndianToDecimal128 which correctly uses `* 8`. The bug corrupts negative Decimal256 values when the Parquet byte width is not a multiple of 8. For example, Decimal256 with precision 40 uses 17 bytes (DecimalSize(40) = 17). Reading such values back splits into iterations of 8 + 8 + 1 bytes, and the 1-byte partial word triggers the broken shift, mangling the sign extension. ### Rationale for this change ### What changes are included in this PR? ### Are these changes tested? ### Are there any user-facing changes? -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
