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GH-50010: [C++][Parquet] Fix undefined behavior in TypedColumnWriterImpl::UpdateLevelHistogram #50011

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GH-50010: [C++][Parquet] Fix undefined behavior in TypedColumnWriterImpl::UpdateLevelHistogram #50011

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13 changes: 6 additions & 7 deletions cpp/src/parquet/column_writer.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -1807,20 +1807,19 @@ class TypedColumnWriterImpl : public ColumnWriterImpl,
return;
}

auto add_levels = [](std::vector<int64_t>& level_histogram,
std::span<const int16_t> levels, int16_t max_level) {
auto add_levels = [](std::vector<int64_t>& level_histogram, const int16_t* levels,
int64_t num_levels, int16_t max_level) {
if (max_level == 0) {
return;
}
ARROW_DCHECK_EQ(static_cast<size_t>(max_level) + 1, level_histogram.size());
::parquet::UpdateLevelHistogram(levels, level_histogram);
std::span<const int16_t> level_span{levels, static_cast<size_t>(num_levels)};
::parquet::UpdateLevelHistogram(level_span, level_histogram);
};

add_levels(page_size_statistics_->definition_level_histogram,
{def_levels, static_cast<size_t>(num_levels)},
add_levels(page_size_statistics_->definition_level_histogram, def_levels, num_levels,
descr_->max_definition_level());
add_levels(page_size_statistics_->repetition_level_histogram,
{rep_levels, static_cast<size_t>(num_levels)},
add_levels(page_size_statistics_->repetition_level_histogram, rep_levels, num_levels,
descr_->max_repetition_level());
}

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