code: def _safe_hstack_numpy(left, right):
      if left is None:
          return right
      return np.hstack([left, right])
  
file_path: pmdarima/pmdarima/preprocessing/exog/dates.py
imports: from .base import BaseExogFeaturizer
  import numpy
  import pandas
  import warnings
label_desc: Use image node_id 1 for calling a global function with example usage: _safe_hstack_numpy(left, right) and returns: np, right