Support vectorized append and compare for multi group by

datafusion/common/src/utils/memory.rs

@@ -102,7 +102,7 @@ pub fn estimate_memory_size<T>(num_elements: usize, fixed_size: usize) -> Result
 
 #[cfg(test)]
 mod tests {
-    use std::collections::HashSet;
+    use std::{collections::HashSet, mem::size_of};
 
     use super::estimate_memory_size;
 

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,