xudong963 commented on code in PR #15432:
URL: https://github.com/apache/datafusion/pull/15432#discussion_r2013679682
##########
datafusion/core/src/datasource/statistics.rs:
##########
@@ -145,7 +147,142 @@ pub async fn get_statistics_with_limit(
Ok((result_files, statistics))
}
-fn add_row_stats(
+/// Generic function to compute statistics across multiple items that have
statistics
+fn compute_summary_statistics<T, I>(
+ items: I,
+ file_schema: &SchemaRef,
+ stats_extractor: impl Fn(&T) -> Option<&Statistics>,
+) -> Statistics
+where
+ I: IntoIterator<Item = T>,
+{
+ let size = file_schema.fields().len();
Review Comment:
From original code:
https://github.com/apache/datafusion/pull/15432/files#diff-7c94461d5e47a42522e6864293a987c452858e1fa6da1e5e1363ee1f6f004a3cL50-L118
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