jonathanc-n commented on code in PR #19957:
URL: https://github.com/apache/datafusion/pull/19957#discussion_r2912728465
##########
datafusion/datasource-parquet/src/metadata.rs:
##########
@@ -541,6 +541,36 @@ fn summarize_min_max_null_counts(
)
.map(|(idx, _)| idx);
+ // Extract distinct counts from row group column statistics
+ accumulators.distinct_counts_array[logical_schema_index] =
+ if let Some(parquet_idx) = parquet_index {
+ let distinct_counts: Vec<u64> = row_groups_metadata
+ .iter()
+ .filter_map(|rg| {
+ rg.columns()
+ .get(parquet_idx)
+ .and_then(|col| col.statistics())
+ .and_then(|stats| stats.distinct_count_opt())
+ })
+ .collect();
+
+ if distinct_counts.is_empty() {
+ Precision::Absent
+ } else if distinct_counts.len() == 1 {
Review Comment:
yes I will try to get #20184 out today ot tomorrow now that #20570 is out
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