fix fmt

core/src/execution/datafusion/expressions/mod.rs

@@ -27,9 +27,9 @@ pub use normalize_nan::NormalizeNaNAndZero;
 pub mod avg;
 pub mod avg_decimal;
 pub mod bloom_filter_might_contain;
+pub mod covariance;
 pub mod strings;
 pub mod subquery;
 pub mod sum_decimal;
 pub mod temporal;
 mod utils;
-pub mod covariance;