wgtmac commented on code in PR #40594:
URL: https://github.com/apache/arrow/pull/40594#discussion_r1860853782
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cpp/src/parquet/column_writer.cc:
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@@ -1554,6 +1591,46 @@ class TypedColumnWriterImpl : public ColumnWriterImpl,
public TypedColumnWriter<
rows_written_ += num_levels;
num_buffered_rows_ += num_levels;
}
+
+ UpdateLevelHistogram(num_levels, def_levels, rep_levels);
+ }
+
+ void UpdateLevelHistogram(int64_t num_levels, const int16_t* def_levels,
+ const int16_t* rep_levels) const {
+ if (page_size_statistics_ == nullptr) {
+ return;
+ }
+
+ auto add_levels = [](std::vector<int64_t>& level_histogram,
+ ::arrow::util::span<const int16_t> levels) {
Review Comment:
`level_histogram` is indeed a vector and should be mutable. Using span for
`levels` is better than raw pointers.
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