Add partial tracing

Author: rmosolgo

lib/graphql/execution/interpreter.rb

@@ -159,8 +159,9 @@ def run_partials(schema, partials, context:)
             dataloader.append_job {
               runtime = Runtime.new(query: partial, lazies_at_depth: lazies_at_depth)
               partial.context.namespace(:interpreter_runtime)[:runtime] = runtime
-              # TODO tracing?
-              runtime.run_partial_eager
+              partial.current_trace.execute_query(query: partial) do
+                runtime.run_partial_eager
+              end
             }
           end
 
@@ -171,8 +172,10 @@ def run_partials(schema, partials, context:)
               runtime = partial.context.namespace(:interpreter_runtime)[:runtime]
               runtime.final_result
             end
-            # TODO tracing?
-            Interpreter::Resolve.resolve_each_depth(lazies_at_depth, multiplex.dataloader)
+            partial = partials.length == 1 ? partials.first : nil
+            multiplex.current_trace.execute_query_lazy(multiplex: multiplex, query: partial) do
+              Interpreter::Resolve.resolve_each_depth(lazies_at_depth, multiplex.dataloader)
+            end
           }
 
           dataloader.run

lib/graphql/query/partial.rb

@@ -1,8 +1,13 @@
 # frozen_string_literal: true
 module GraphQL
   class Query
-    # This class is _like_ a {GraphQL::Query}, except
-    # @see Query#run_partials
+    # This class is _like_ a {GraphQL::Query}, except it can run on an arbitrary path within a query string.
+    #
+    # It depends on a "parent" {Query}.
+    #
+    # During execution, it calls query-related tracing hooks but passes itself as `query:`.
+    #
+    # @see Query#run_partials Run via {Query#run_partials}
     class Partial
       include Query::Runnable