Comments (8)
That's a lot of code and stuff I'm not familiar with, it would be really useful to try to pare down the reproducer to the minimum required to show the problem.
At a complete guess columns=column_dict
in pd.DataFrame()
is passing some non-string items derived from the database stuff. You may need explicit str()
around these.
from fastparquet.
from fastparquet.
same error when attempting to turn all columns into strings...
data_query: str = "Select {} from archive.Ibs.PHOALD WITH (NOLOCK) Where Convert(date, Transaction_time) > Convert("
"date, '2019-05-20') and Convert(date, Transaction_time) <= Convert(date, '2019-06-20') "
...
cursor = conn.cursor()
metadata_sql = 'select top 1 * from archive.Ibs.PHOALD WITH (NOLOCK)'
print(metadata_sql)
cursor.execute(metadata_sql)
column_names = ''
field_names = [i[0] for i in cursor.description]
for j in field_names:
j = 'convert(nvarchar, ' + j + ') as ' + j
column_names = column_names + ',' + j
column_names = column_names[1:]
print(f"{column_names}")
sql = data_query.format(column_names)
print(f"{sql}")
from fastparquet.
A "quoted_name" is entering into your dataframe metadata somewhere, so the task is to find out where. Maybe fastparquet should be converting it to a string internally, but I would bet that requiring a real string is a reasonable expectation in this case.
I'm afraid I don't really know what your code it doing, I don't normally work with DB cursor objects. You might find it easier to use pd.from_sql_query instead, as I suspect it might do the correct conversions for you.
from fastparquet.
the problem definitely looks like it is native to the fastparquet code. i've called it without modification and it is still throwing the error.
from fastparquet.
i've called it without modification and it is still throwing the error.
What did you call exactly? Did you manage to make a dataframe showing this problem without SQL?
from fastparquet.
from fastparquet.
I mean:
b_df = pd.DataFrame(row_batch, columns=column_dict, dtype=str)
b_df = b_df.astype(dtype=column_dict)
here both the original columns
and the ones supplied in dtype=
have keys that came from the SQL driver, and probably responsible for the "quoted_name" in the error. Try converting them to actual str before doing anything with them:
columns = {str(k): v for k, v in columns_dict.items()}
Are the dtypes really all str?
from fastparquet.
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from fastparquet.