andygrove commented on code in PR #1029:
URL: https://github.com/apache/datafusion-comet/pull/1029#discussion_r1814310048
##########
native/core/src/execution/jni_api.rs:
##########
@@ -346,6 +347,10 @@ pub unsafe extern "system" fn
Java_org_apache_comet_Native_executePlan(
let exec_context_id = exec_context.id;
+ // We maintain a map of metrics name -> jstring object to reduce the
overhead of calling
+ // jni_NewStringUTF repeatedly.
+ let mut metrics_jstrings: HashMap<String, Arc<GlobalRef>> =
HashMap::new();
Review Comment:
Rather than creating this hash map on each call to `executePlan`, could we
create it during `createPlan` and store it in the `ExecutionContext`? This
would allow us to allocate the strings once per plan rather than once per
output batch. The resources would then be freed in `releasePlan`.
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