fix fmt

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

@@ -17,18 +17,17 @@
 
 //! Defines physical expressions that can evaluated at runtime during query execution
 
-use std::any::Any;
-use std::sync::Arc;
-
-use arrow::{array::ArrayRef, datatypes::DataType, datatypes::Field};
-use datafusion::logical_expr::Accumulator;
-use datafusion_common::ScalarValue;
-use datafusion_common::{internal_err, Result};
-use datafusion_physical_expr::{AggregateExpr, PhysicalExpr};
-use datafusion_physical_expr::expressions::format_state_name;
-use crate::execution::datafusion::expressions::stats::StatsType;
-use crate::execution::datafusion::expressions::utils::down_cast_any_ref;
-use crate::execution::datafusion::expressions::variance::VarianceAccumulator;
+use std::{any::Any, sync::Arc};
+
+use crate::execution::datafusion::expressions::{
+    stats::StatsType, utils::down_cast_any_ref, variance::VarianceAccumulator,
+};
+use arrow::{
+    array::ArrayRef,
+    datatypes::{DataType, Field},
+};
+use datafusion_common::{internal_err, Result, ScalarValue};
+use datafusion_physical_expr::{expressions::format_state_name, AggregateExpr, PhysicalExpr};
 
 /// STDDEV and STDDEV_SAMP (standard deviation) aggregate expression
 /// The implementation mostly is the same as the DataFusion's implementation. The reason