code: def single_column_frame():
      return H2OFrame(
          python_obj=[[1], [2], [3], [4], [5]], column_names=["CA"]
      )
  
file_path: h2o-3/h2o-py/tests/testdir_misc/pyunit_expr_optimizations.py
imports: import h2o
  import sys
  from tests import pyunit_utils
  from h2o import H2OFrame
  from h2o.expr import ExprNode
label_desc: Use image node_id 11 for calling a global function with example usage: single_column_frame() and returns: H2OFrame