code: def test_vector_empty(unary_vector_func_fixture):
      arr = pa.array([1], pa.float64())
      result = pc.call_function("y=pct_rank(x)", [arr])
      expected = unary_vector_func_fixture[0](None, arr)
      assert result == expected
  
imports: import pytest
  import numpy
  import pyarrow
  from pyarrow import compute
label_desc: Use image node_id 59 for calling a global function with example usage: test_vector_empty(unary_vector_func_fixture) without return types