fix compile in rust 1.79.

datafusion/common/src/utils/memory.rs

@@ -102,14 +102,14 @@ pub fn estimate_memory_size<T>(num_elements: usize, fixed_size: usize) -> Result
 
 #[cfg(test)]
 mod tests {
-    use std::{collections::HashSet, mem};
+    use std::{collections::HashSet, mem::size_of};
 
     use super::estimate_memory_size;
 
     #[test]
     fn test_estimate_memory() {
         // size (bytes): 48
-        let fixed_size = mem::size_of::<HashSet<u32>>();
+        let fixed_size = size_of::<HashSet<u32>>();
 
         // estimated buckets: 16 = (8 * 8 / 7).next_power_of_two()
         let num_elements = 8;
@@ -127,7 +127,7 @@ mod tests {
     #[test]
     fn test_estimate_memory_overflow() {
         let num_elements = usize::MAX;
-        let fixed_size = mem::size_of::<HashSet<u32>>();
+        let fixed_size = size_of::<HashSet<u32>>();
         let estimated = estimate_memory_size::<u32>(num_elements, fixed_size);
 
         assert!(estimated.is_err());

datafusion/core/tests/user_defined/user_defined_aggregates.rs

@@ -19,6 +19,7 @@
 //! user defined aggregate functions
 
 use std::hash::{DefaultHasher, Hash, Hasher};
+use std::mem::{size_of, size_of_val};
 use std::sync::{
     atomic::{AtomicBool, Ordering},
     Arc,

datafusion/proto/tests/cases/roundtrip_logical_plan.rs

@@ -29,6 +29,7 @@ use prost::Message;
 use std::any::Any;
 use std::collections::HashMap;
 use std::fmt::{self, Debug, Formatter};
+use std::mem::size_of_val;
 use std::sync::Arc;
 use std::vec;
 

datafusion/substrait/tests/cases/roundtrip_logical_plan.rs

@@ -23,6 +23,7 @@ use datafusion_substrait::logical_plan::{
     consumer::from_substrait_plan, producer::to_substrait_plan,
 };
 use std::cmp::Ordering;
+use std::mem::size_of_val;
 
 use datafusion::arrow::datatypes::{DataType, Field, IntervalUnit, Schema, TimeUnit};
 use datafusion::common::{not_impl_err, plan_err, DFSchema, DFSchemaRef};