code: def mergeOneEmptyFrame():
      # PUBDEV-6987: merge with one empty frame and one normal frame.
      file1 = h2o.H2OFrame({"A1": [1], "A2": [0]})
      file2 = h2o.H2OFrame({"A1": [], "A2": []})
      f1Mergef2 = file1.merge(
          file2, all_x=True
      )  # should contain content of file1, merge everything in f1
      f2Mergef1 = file2.merge(
          file1, all_y=True
      )  # should contain content of file1, merge everything in f2
      print(
          "checking merge empty with all_y = True.  row 0 col 0: {0}, row 0 col 1: {1}".format(
              f2Mergef1[0, "A1"], f2Mergef1[0, "A2"]
          )
      )
      print(
          "checking merge empty with all_x = True. row 0 col 0: {0}, row 0 col 1: {1}".format(
              f1Mergef2[0, "A1"], f1Mergef2[0, "A2"]
          )
      )
      assert (
          f2Mergef1[0, "A1"] == 1
      ), "f2Mergef1: Expected content 1 at row 0, col 0 but actual content is {0}".format(
          f2Mergef1[0, "A1"]
      )
      assert (
          f2Mergef1[0, "A2"] == 0
      ), "f2Mergef1: Expected content 0 at row 0, col 1 but actual content is {0}".format(
          f2Mergef1[0, "A2"]
      )
      assert (
          f1Mergef2[0, "A1"] == 1
      ), "f1Mergef2: Expected content 1 at row 0, col 0 but actual content is {0}".format(
          f1Mergef2[0, "A1"]
      )
      assert (
          f1Mergef2[0, "A2"] == 0
      ), "f1Mergef2: Expected content 0 at row 0, col 1 but actual content is {0}".format(
          f1Mergef2[0, "A2"]
      )
      assert (
          f1Mergef2.nrow == 1
      ), "Expected one row  but actual number of row is {0}!".format(
          f1Mergef2.nrows
      )
      assert (
          f2Mergef1.nrow == 1
      ), "Expected one row  but actual number of row is {0}!".format(
          f2Mergef1.nrows
      )
      assert (
          f1Mergef2.ncols == 2
      ), "Expected two columns but actual number of row is {0}!".format(
          f1Mergef2.ncols
      )
      assert (
          f2Mergef1.ncols == 2
      ), "Expected two columns but actual number of row is {0}!".format(
          f2Mergef1.ncols
      )
  
      # all_x = all_y = False, only merge rows that appear both it the right and left frames
      f1Mergef2 = file1.merge(file2)  # right frame is empty, stall here
      f2Mergef1 = file2.merge(
          file1
      )  # left frame is empty, should return empty frame
      f2Mergef2 = file2.merge(
          file2
      )  # merging of empty frame with just headers
  
      # all three frames should have zero number of rows
      assert (
          f1Mergef2.nrows == 0
      ), "Expected empty rows but actual number of row is {0}!".format(
          f1Mergef2.nrows
      )
      assert (
          f2Mergef1.nrows == 0
      ), "Expected empty rows but actual number of row is {0}!".format(
          f2Mergef1.nrows
      )
      assert (
          f2Mergef2.nrows == 0
      ), "Expected empty rows but actual number of row is {0}!".format(
          f2Mergef2.nrows
      )
  
label_desc: Use image node_id 1 for calling a global function with example usage: mergeOneEmptyFrame() without return types