diff --git a/baselines/python_samples/spanstore_aggregate.py b/baselines/python_samples/spanstore_aggregate.py
new file mode 100644
index 0000000..03705e1
--- /dev/null
+++ b/baselines/python_samples/spanstore_aggregate.py
@@ -0,0 +1,59 @@
+from sky_pie_baselines import spanstore_aggregate
+from pydantic import BaseModel
+from datetime import datetime
+from typing import Literal
+from collections import defaultdict
+import time
+
+class Request(BaseModel):
+    timestamp: datetime
+    op: Literal["read", "write", "evict"]
+    issue_region: str
+    obj_key: str
+    size: float
+
+
+def spanstore_aggregate_py(requests, objects_in_access_set):
+    put_counts = defaultdict(int)
+    get_counts = defaultdict(int)
+    ingress_counts = defaultdict(float)
+    egress_counts = defaultdict(float)
+    
+    for i in range(len(requests)):
+            request = requests[i]
+            if request.obj_key in objects_in_access_set:
+                if request.op == "write":
+                    put_counts[request.issue_region] += 1
+                    ingress_counts[request.issue_region] += request.size
+                elif request.op == "read":
+                    get_counts[request.issue_region] += 1
+                    egress_counts[request.issue_region] += request.size
+    return put_counts, get_counts, ingress_counts, egress_counts
+
+if __name__ == "__main__":
+    no_objects = 10000
+    objects_in_access_set = [ f"key{i}" for i in range(no_objects)]
+    region = ['gcp:europe-west1-b','azure:eastus','azure:westus','gcp:us-east1-b', 'gcp:us-west1-a', 'azure:westeurope', 'aws:us-east-1', 'aws:eu-west-1', 'azure:westus']
+    timestamp = datetime.now()
+    requests = [
+        Request(timestamp=timestamp, op="read" if (i % 2) == 0 else "write", issue_region=region[i % len(region)], obj_key=objects_in_access_set[i], size=float(i))
+        for i in range(no_objects)
+    ]
+    #print(requests)
+    start1 = time.time_ns()
+    res1 = spanstore_aggregate(requests, objects_in_access_set)
+    end1 = time.time_ns()
+    duration1 = (end1 - start1) / 1e6
+    print(f"Time taken by Rust function: {duration1} ms")
+
+    start2 = time.time_ns()
+    res2 = spanstore_aggregate_py(requests, objects_in_access_set)
+    end2 = time.time_ns()
+    duration2 = (end2 - start2) / 1e6
+    assert(res1 == res2)
+    print(f"Time taken by Python function: {duration2} ms")
+    print(f"Speedup: {duration2/duration1}")
+    #put_counts, get_counts, ingress_counts, egress_counts = res1
+    #put_counts2, get_counts2, ingress_counts2, egress_counts2 = res2
+    #print(put_counts, get_counts, ingress_counts, egress_counts)
+    #print(put_counts2, get_counts2, ingress_counts2, egress_counts2)
\ No newline at end of file
diff --git a/baselines/src/sky_pie_baselines.rs b/baselines/src/sky_pie_baselines.rs
index ae76683..4d5257e 100644
--- a/baselines/src/sky_pie_baselines.rs
+++ b/baselines/src/sky_pie_baselines.rs
@@ -1,4 +1,6 @@
 use pyo3::prelude::*;
+use pyo3::types::{PyList, PyTuple};
+use std::collections::HashMap;
 
 mod optimizer;
 use optimizer::Optimizer;
@@ -12,11 +14,57 @@ use workload::Workload;
 mod py_loader;
 use py_loader::PyLoader;
 
+
+
+#[pyfunction]
+fn spanstore_aggregate(requests: &PyList, objects_in_access_set: Vec<&str>) -> (HashMap<String, i64>,HashMap<String, i64>,HashMap<String, f64>,HashMap<String, f64>) /* PyResult<PyTuple> */ {
+
+    let mut put_counts = HashMap::<String, i64>::new();
+    let mut get_counts = HashMap::<String, i64>::new();
+    let mut ingress_counts = HashMap::<String, f64>::new();
+    let mut egress_counts = HashMap::<String, f64>::new();
+
+    // Convert object_in_access_set to a HashSet
+    let objects_in_access_set: std::collections::HashSet<&str> = objects_in_access_set.iter().cloned().collect();
+
+    // Iterate over the list of requests and print them
+    for request in requests.iter() {
+        // Get request type
+        let obj_key = request.getattr("obj_key").unwrap().extract::<String>().unwrap();
+        if objects_in_access_set.contains(&obj_key.as_str()) {
+            let op = request.getattr("op").unwrap().extract::<String>().unwrap();
+            let issue_region = request.getattr("issue_region").unwrap().extract::<String>().unwrap();
+            let size = request.getattr("size").unwrap().extract::<f64>().unwrap();
+
+            if op == "write" {
+                let put_count = put_counts.entry(issue_region.clone()).or_insert(0);
+                *put_count += 1;
+                let ingress_count = ingress_counts.entry(issue_region.clone()).or_insert(0.0);
+                *ingress_count += size;
+            } else if op == "read" {
+                let get_count = get_counts.entry(issue_region.clone()).or_insert(0);
+                *get_count += 1;
+                let egress_count = egress_counts.entry(issue_region.clone()).or_insert(0.0);
+                *egress_count += size;
+            }
+        }
+
+    }
+    
+    /* println!("put_counts: {:?} ", put_counts);
+    println!("get_counts: {:?}", get_counts);
+    println!("ingress_counts: {:?}", ingress_counts);
+    println!("egress_counts: {:?}", egress_counts); */
+    
+    return (put_counts, get_counts, ingress_counts, egress_counts); //.into_py();
+}
+
 #[pymodule]
 fn sky_pie_baselines(_py: Python, m: &PyModule) -> PyResult<()> {
     m.add_class::<ProfitBasedOptimizer>()?;
     m.add_class::<KmeansOptimizer>()?;
     m.add_class::<Workload>()?;
     m.add_class::<PyLoader>()?;
+    m.add_wrapped(wrap_pyfunction!(spanstore_aggregate))?;
     Ok(())
 }
\ No newline at end of file