xudong963 commented on code in PR #16412:
URL: https://github.com/apache/datafusion/pull/16412#discussion_r2278570400
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datafusion/datasource-parquet/src/file_format.rs:
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@@ -1967,6 +2011,31 @@ fn create_max_min_accs(
(max_values, min_values)
}
+/// Checks if any occurrence of `value` in `array` corresponds to a `true`
+/// entry in the `exactness` array.
+///
+/// This is used to determine if a calculated statistic (e.g., min or max)
+/// is exact, by checking if at least one of its source values was exact.
+///
+/// # Example
+/// - `value`: `0`
+/// - `array`: `[0, 1, 0, 3, 0, 5]`
+/// - `exactness`: `[true, false, false, false, false, false]`
+///
+/// The value `0` appears at indices `[0, 2, 4]`. The corresponding exactness
+/// values are `[true, false, false]`. Since at least one is `true`, the
+/// function returns `Some(true)`.
+fn has_any_exact_match(
Review Comment:
Do we have a test for this?
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