Method num_probe_threads

be/src/exec/join-builder.h:155–155

  void CloseBeforeProbe(RuntimeState* join_node_state);

  int num_probe_threads() const { return num_probe_threads_; }

  static string ConstructBuilderName(const char* name, int join_node_id) {
    return strings::Substitute("$0 Join Builder (join_node_id=$1)", name, join_node_id);