code: def constant_na(context, builder, ty, pyval):
      # This handles None, etc.
      return context.get_dummy_value()
  
imports: import operator
  from llvmlite import ir
  from numba.core import cgutils
  from numba.core.typing import signature
  from numba.cuda.cudaimpl import lower, registry
  from numba.extending import lower_builtin, types
  from cudf.core.udf import api
  from cudf.core.udf._ops import arith_ops, bitwise_ops, comparison_ops, unary_ops
  from cudf.core.udf.masked_typing import MaskedType, NAType, _supported_masked_types
label_desc: Use image node_id 1 for calling a global function with example usage: constant_na(context, builder, ty, pyval) and returns: context