@staticmethod
def _dimensions_to_values(dimensions):
    """
        Replace dimensions specs with their `dimension`
        values, and ignore those without
        """
    values = []
    for dimension in dimensions:
        if isinstance(dimension, dict):
            if 'extractionFn' in dimension:
                values.append(dimension)
            elif 'dimension' in dimension:
                values.append(dimension['dimension'])
        else:
            values.append(dimension)
    return values
