mapleFU commented on code in PR #43726:
URL: https://github.com/apache/arrow/pull/43726#discussion_r1719854971
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cpp/src/arrow/dataset/file_parquet.cc:
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@@ -366,8 +366,9 @@ std::optional<compute::Expression>
ParquetFileFragment::EvaluateStatisticsAsExpr
const parquet::Statistics& statistics) {
auto field_expr = compute::field_ref(field_ref);
+ bool may_has_null = !statistics.HasNullCount() || statistics.null_count() !=
0;
// Optimize for corner case where all values are nulls
- if (statistics.num_values() == 0 && statistics.null_count() > 0) {
+ if (statistics.num_values() == 0 && may_has_null) {
Review Comment:
One possible case: num_value and num_rows == 0, and `!HasNullCount()`, this
might be weird
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