code: def delete_index(self, cardinality):
          
          DatabaseConnector.delete_index(self, cardinality)
  
          query = "DROP INDEX IF EXISTS idx_{0}_gram_varchar;".format(cardinality)
          self.execute_sql(query)
          query = "DROP INDEX IF EXISTS idx_{0}_gram_normalized_varchar;".format(
              cardinality)
          self.execute_sql(query)
          query = "DROP INDEX IF EXISTS idx_{0}_gram_lower_varchar;".format(
              cardinality)
          self.execute_sql(query)
          query = "DROP INDEX IF EXISTS idx_{0}_gram_lower_normalized_varchar;".\
              format(cardinality)
          self.execute_sql(query)
          for i in reversed(range(cardinality)):
              if i != 0:
                  query = "DROP INDEX IF EXISTS idx_{0}_gram_{1}_lower;".format(
                      cardinality, i)
                  self.execute_sql(query)
docs: Delete index for the table with the given cardinality.
  
          Parameters
          ----------
          cardinality : int
              The cardinality of the index to delete.