message: Fix 5479 - unicode columns issue.
diff: @@ -726,7 +726,7 @@ class Database(Model, AuditMixinNullable, ImportMixin):
  return self.get_dialect().identifier_preparer.quote
  def get_df(self, sql, schema):
  - sqls = [str(s).strip().strip(';') for s in sqlparse.parse(sql)]
  + sqls = [six.text_type(s).strip().strip(';') for s in sqlparse.parse(sql)]
  engine = self.get_sqla_engine(schema=schema)
  def needs_conversion(df_series):
  