pitrou commented on code in PR #35989:
URL: https://github.com/apache/arrow/pull/35989#discussion_r1238745822
##########
cpp/src/parquet/metadata.cc:
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@@ -87,20 +87,29 @@ std::string ParquetVersionToString(ParquetVersion::type
ver) {
template <typename DType>
static std::shared_ptr<Statistics> MakeTypedColumnStats(
const format::ColumnMetaData& metadata, const ColumnDescriptor* descr) {
+ DCHECK(metadata.__isset.statistics);
+ int64_t num_non_null_values = 0;
+ if (metadata.statistics.__isset.null_count) {
+ num_non_null_values = metadata.num_values - metadata.statistics.null_count;
+ } else {
+ // NOTE: statistics should `metadata.statistics.__isset.null_count`
+ // has a invalid non-null value number.
Review Comment:
What is a "invalid non-null value number"? I don't understand.
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