code: def build_filter(self):
      if self.cfg.get("query") is None:
          return None
      return self.cfg
  
imports: import json
  import numpy
  import pandas
  import dtale.global_state
  from dtale.utils import classify_type, find_dtype, format_data, make_list
  from dtale.query import build_col_key
label_desc: Use image node_id 2 for calling the OutlierFilter obj's underlying member method code with example usage: obj.build_filter() and returns: self, None