fix clippy.

Author: Rachelint

datafusion/core/tests/fuzz_cases/aggregate_fuzz.rs

@@ -19,11 +19,10 @@ use std::sync::Arc;
 
 use arrow::array::{Array, ArrayRef, AsArray, Int64Array};
 use arrow::compute::{concat_batches, SortOptions};
-use arrow::datatypes::{DataType, Decimal128Type};
+use arrow::datatypes::DataType;
 use arrow::record_batch::RecordBatch;
 use arrow::util::pretty::pretty_format_batches;
 use arrow_array::types::Int64Type;
-use arrow_ipc::Decimal;
 use arrow_schema::{
     IntervalUnit, TimeUnit, DECIMAL128_MAX_PRECISION, DECIMAL128_MAX_SCALE,
     DECIMAL256_MAX_PRECISION, DECIMAL256_MAX_SCALE,