code: def get_refs(*exprs: Expression) -> Dict[str, Indices]:
      builder = {}
      for e in exprs:
          _get_refs(e, builder)
      return builder
  
file_path: hail/hail/python/hail/expr/expressions/expression_utils.py
imports: from typing import Set, Dict
  from hail.typecheck import typecheck, setof
  from .indices import Indices, Aggregation
  from ..expressions import Expression, ExpressionException, expr_any
  from ...ir import MakeTuple
label_desc: Use image node_id 7 for calling a global function with example usage: get_refs() and returns: builder