mbutrovich commented on code in PR #1029:
URL: https://github.com/apache/datafusion-comet/pull/1029#discussion_r1814900680
##########
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:
Yep I think I can do that. I originally went down that path and tried to
populate it during `CreatePlan` and then realized that I could only allocate
the strings lazily. However, there's nothing stopping me from hoisting the data
structure itself to the `ExecutionContext`. I do wonder about thread safety
though.
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