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Fix the int32 overflow when computing page fragment sizes for large string columns #16028

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merged 2 commits into from
Jun 14, 2024
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Fix the int32 overflow when computing page fragment sizes for large string columns #16028

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Fix int32 overflow for large string columns when computing fragment s…
mhaseeb123 Jun 13, 2024
85299e4
Merge branch 'rapidsai:branch-24.08' into pq-large-strings-zstd-comp
mhaseeb123 Jun 13, 2024
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4 changes: 2 additions & 2 deletions cpp/src/io/parquet/writer_impl.cu
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Original file line number Diff line number Diff line change
Expand Up @@ -1763,10 +1763,10 @@ auto convert_table_to_parquet_data(table_input_metadata& table_meta,
// for multiple fragments per page to smooth things out. using 2 was too
// unbalanced in final page sizes, so using 4 which seems to be a good
// compromise at smoothing things out without getting fragment sizes too small.
auto frag_size_fn = [&](auto const& col, size_type col_size) {
auto frag_size_fn = [&](auto const& col, size_t col_size) {
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int const target_frags_per_page = is_col_fixed_width(col) ? 1 : 4;
auto const avg_len =
target_frags_per_page * util::div_rounding_up_safe<size_type>(col_size, input.num_rows());
target_frags_per_page * util::div_rounding_up_safe<size_t>(col_size, input.num_rows());
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if (avg_len > 0) {
auto const frag_size = util::div_rounding_up_safe<size_type>(max_page_size_bytes, avg_len);
return std::min<size_type>(max_page_fragment_size, frag_size);
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