jonathanc-n commented on code in PR #20846:
URL: https://github.com/apache/datafusion/pull/20846#discussion_r2913061441
##########
datafusion/physical-plan/src/union.rs:
##########
@@ -854,7 +853,7 @@ fn col_stats_union(
mut left: ColumnStatistics,
right: &ColumnStatistics,
) -> ColumnStatistics {
- left.distinct_count = Precision::Absent;
+ left.distinct_count =
left.distinct_count.add(&right.distinct_count).to_inexact();
Review Comment:
@asolimando Do you think this would be a better alternative when merging
parquet row groups instead of max?
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