pyflink1.11 table.to_pandas() 报错 'Sort on a non-time-attribute field is not supported.'

Wed, 27 Jan 2021 01:44:40 -0800 

通过sql_query执行返回table对象，执行table.to_pandas()报错：
Traceback (most recent call last):
  File 
"C:/projects/dataService-pyflink_explore/dataService-calculate-code-python/src/test/test_mysql_connector.py",
 line 161, in <module>
    print(table.to_pandas().head(6))
  File 
"C:\Users\18242\AppData\Local\Programs\Python\Python37\lib\site-packages\pyflink\table\table.py",
 line 723, in to_pandas
    .collectAsPandasDataFrame(self._j_table, max_arrow_batch_size)
  File 
"C:\Users\18242\AppData\Local\Programs\Python\Python37\lib\site-packages\py4j\java_gateway.py",
 line 1286, in __call__
    answer, self.gateway_client, self.target_id, self.name)
  File 
"C:\Users\18242\AppData\Local\Programs\Python\Python37\lib\site-packages\pyflink\util\exceptions.py",
 line 154, in deco
    raise exception_mapping[exception](s.split(': ', 1)[1], stack_trace)
pyflink.util.exceptions.TableException: 'Sort on a non-time-attribute field is 
not supported.'
请教各位大佬，为什么会转换失败？但表格本身print_schema是没问题的。

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