Remove unused import detected by nightly rust (#5477)

* remove unused import

* remove more unused code

* suppress warning on make_fixed_len_byte_array_reader

* update fmt

* Update parquet/src/arrow/array_reader/mod.rs

Co-authored-by: Raphael Taylor-Davies <1781103+tustvold@users.noreply.github.com>

* add back the lz4_codec

---------

Co-authored-by: Raphael Taylor-Davies <1781103+tustvold@users.noreply.github.com>

Author: XiangpengHao

arrow-arith/src/aggregate.rs

@@ -22,7 +22,6 @@ use arrow_array::iterator::ArrayIter;
 use arrow_array::*;
 use arrow_buffer::{ArrowNativeType, NullBuffer};
 use arrow_data::bit_iterator::try_for_each_valid_idx;
-use arrow_schema::ArrowError;
 use arrow_schema::*;
 use std::borrow::BorrowMut;
 use std::ops::{BitAnd, BitOr, BitXor};
@@ -729,7 +728,6 @@ where
 mod tests {
     use super::*;
     use arrow_array::types::*;
-    use arrow_buffer::NullBuffer;
     use std::sync::Arc;
 
     #[test]

arrow-array/src/array/dictionary_array.rs

@@ -20,8 +20,7 @@ use crate::cast::AsArray;
 use crate::iterator::ArrayIter;
 use crate::types::*;
 use crate::{
-    make_array, Array, ArrayAccessor, ArrayRef, ArrowNativeTypeOp, ArrowPrimitiveType,
-    PrimitiveArray, StringArray,
+    make_array, Array, ArrayAccessor, ArrayRef, ArrowNativeTypeOp, PrimitiveArray, StringArray,
 };
 use arrow_buffer::bit_util::set_bit;
 use arrow_buffer::buffer::NullBuffer;
@@ -1007,12 +1006,9 @@ impl<K: ArrowDictionaryKeyType> AnyDictionaryArray for DictionaryArray<K> {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::builder::PrimitiveDictionaryBuilder;
     use crate::cast::as_dictionary_array;
-    use crate::types::{Int32Type, Int8Type, UInt32Type, UInt8Type};
     use crate::{Int16Array, Int32Array, Int8Array};
     use arrow_buffer::{Buffer, ToByteSlice};
-    use std::sync::Arc;
 
     #[test]
     fn test_dictionary_array() {

arrow-array/src/array/fixed_size_binary_array.rs

@@ -636,7 +636,6 @@ impl<'a> IntoIterator for &'a FixedSizeBinaryArray {
 mod tests {
     use crate::RecordBatch;
     use arrow_schema::{Field, Schema};
-    use std::sync::Arc;
 
     use super::*;
 

arrow-array/src/array/map_array.rs

@@ -441,7 +441,6 @@ mod tests {
     use crate::types::UInt32Type;
     use crate::{Int32Array, UInt32Array};
     use arrow_schema::Fields;
-    use std::sync::Arc;
 
     use super::*;
 

arrow-array/src/array/primitive_array.rs

@@ -1501,9 +1501,8 @@ mod tests {
     use super::*;
     use crate::builder::{Decimal128Builder, Decimal256Builder};
     use crate::cast::downcast_array;
-    use crate::{ArrayRef, BooleanArray};
+    use crate::BooleanArray;
     use arrow_schema::TimeUnit;
-    use std::sync::Arc;
 
     #[test]
     fn test_primitive_array_from_vec() {

arrow-array/src/array/run_array.rs

@@ -654,17 +654,15 @@ where
 
 #[cfg(test)]
 mod tests {
-    use std::sync::Arc;
-
     use rand::seq::SliceRandom;
     use rand::thread_rng;
     use rand::Rng;
 
     use super::*;
     use crate::builder::PrimitiveRunBuilder;
     use crate::cast::AsArray;
-    use crate::types::{Int16Type, Int32Type, Int8Type, UInt32Type};
-    use crate::{Array, Int32Array, StringArray};
+    use crate::types::{Int8Type, UInt32Type};
+    use crate::{Int32Array, StringArray};
 
     fn build_input_array(size: usize) -> Vec<Option<i32>> {
         // The input array is created by shuffling and repeating

arrow-array/src/array/struct_array.rs

@@ -464,7 +464,6 @@ mod tests {
 
     use crate::{BooleanArray, Float32Array, Float64Array, Int32Array, Int64Array, StringArray};
     use arrow_buffer::ToByteSlice;
-    use std::sync::Arc;
 
     #[test]
     fn test_struct_array_builder() {

arrow-array/src/array/union_array.rs

@@ -511,7 +511,6 @@ mod tests {
     use crate::RecordBatch;
     use crate::{Float64Array, Int32Array, Int64Array, StringArray};
     use arrow_schema::Schema;
-    use std::sync::Arc;
 
     #[test]
     fn test_dense_i32() {

arrow-array/src/builder/boolean_builder.rs

@@ -217,7 +217,6 @@ impl Extend<Option<bool>> for BooleanBuilder {
 mod tests {
     use super::*;
     use crate::Array;
-    use arrow_buffer::Buffer;
 
     #[test]
     fn test_boolean_array_builder() {

arrow-array/src/builder/buffer_builder.rs

@@ -15,7 +15,6 @@
 // specific language governing permissions and limitations
 // under the License.
 
-use crate::array::ArrowPrimitiveType;
 pub use arrow_buffer::BufferBuilder;
 use half::f16;