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GH-51135: [C++][Parquet] Avoid misaligned stores when reading BYTE_ARRAY decimals#51136

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Merged
HuaHuaY merged 1 commit into from
Sep 2, 2026
+1 −3
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GH-51135: [C++][Parquet] Avoid misaligned stores when reading BYTE_ARRAY decimals #51136

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4 changes: 1 addition & 3 deletions cpp/src/parquet/arrow/reader_internal.cc
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Original file line numberDiff line numberDiff line change
Expand Up@@ -725,9 +725,7 @@ struct DecimalConverter<DecimalArrayType, ByteArrayType> {
return Status::Invalid("Invalid BYTE_ARRAY length for ", type->ToString());
}

auto out_ptr_view = reinterpret_cast<uint64_t*>(out_ptr);
out_ptr_view[0] = 0;
out_ptr_view[1] = 0;
std::memset(out_ptr, 0, type_length);

// only convert rows that are not null if there are nulls, or
// all rows, if there are not
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