anchor.diff:      "test_searched_case_column"
       "test_simple_case_column"
       "test_summary_non_numeric_group_by"
  +  ];
  +
  +  pytestFlagsArray = [
  +    "--numprocesses $NIX_BUILD_CORES"
  +    "ibis/tests"
  +    "ibis/backends/tests"
  +    "ibis/backends/{${lib.concatStringsSep "," backends}}/tests"
     ];
   
     preCheck = ''
  
positive.code:     export PYTEST_BACKENDS="${backendsString}"
    '';
  
    checkPhase = ''
      set -euo pipefail
  
      runHook preCheck
  
      pytest --numprocesses auto \
        ibis/tests \
        ibis/backends/tests \
        ibis/backends/{${lib.concatStringsSep "," backends}}/tests \
        -k '${lib.concatMapStringsSep " and " (test: "not ${test}") disabledTests}'
  
      runHook postCheck
    '';
  
    pythonImportsCheck = [ "ibis" ] ++ (map (backend: "ibis.backends.${backend}") backends);
  
    meta = with lib; {
  
negative.code:   ] ++ lib.optionals (pythonOlder "3.8") [ importlib-metadata ];
  
    checkInputs = [
      pytestCheckHook
      click
      pytest
      pytest-mock
  