Hello!
First of all thank you very much for your efforts on Apache Arrow! This looks very useful and prominent tech to be able use it in self-BI area.
 
I faced such issues - get Subj Error
ArrowNotImplementedError: No cast implemented from decimal(2,2) to decimal(12,2)
when trying to pyarrow.Table.from_batches array of values defined in schema as pyarrow.decimal128(12,2).
 
Which values are in fact column of sqlAlchemy.sql.sqltypes.DECIMAL()="DECIMAL(precision=12,scale=2)" values, which I map in schema like this pyarrow.decimal128(12,2).
 
What could be a reason of issue?
Could it be that somehow declared decimal type of data is reduced to minimum value which met in data? :/
 
With best regards,
Dima Fomin

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