code: def require_key(table, method):
      if len(table.key) == 0:
          raise ValueError(
              "Method '{}' requires a non-empty key".format(method)
          )
  
imports: from typing import Union
  import hail
  from hail.expr import Expression, expr_numeric, expr_array, expr_interval, expr_any, construct_expr, construct_variable
  from hail.expr.types import tlocus, tarray, tstr, tstruct, ttuple
  from hail.matrixtable import MatrixTable
  from hail.table import Table
  from hail.typecheck import typecheck, nullable, func_spec, oneof
  from hail.utils import Interval, Struct, new_temp_file, deduplicate
  from hail.utils.misc import plural
  from hail.utils.java import Env, info
  from hail import ir
label_desc: Use image node_id 8 for calling a global function with example usage: require_key(table, method) without return types