[BUG] could not convert string to float

py3.7
pyodps[mars]==0.11

df = md.DataFrame(mt.random.rand(100000000, 4), columns=list('abcd'))
print(df.sum().execute())

{ValueError}could not convert string to float: '\r\n\r\n\r\n\n\n\n\n \n \n \n 淘宝网 - 淘！我喜欢\n \n \n \n \n \n \n

Start by reproducing the supplied Python 3.7 case with pyodps[mars], focusing on DataFrame.sum().execute() and the reported float conversion error. Trace the execution path that handles the input containing HTML text; done means the example completes without raising this ValueError.

Written by the indexing model from the issue text.