TypeMismatchException when delta has a new field in struct.

[mervynzhang]

Hi there,

Got the following error when reading a delta table,

TypeMismatchException: Mismatch Type Error: Type 
STRUCT(a VARCHAR, b VARCHAR, c VARCHAR) does not match with 
STRUCT(a VARCHAR, b VARCHAR, c VARCHAR, 
       d VARCHAR). 
Cannot cast STRUCTs of different size

I compare the table schema, it indeed has a new filed in this struct.

It looks very similar to duckdb/duckdb#7734, it's fixed for python, not sure it should be fixed in duckdb or delta side?

Thanks

[samansmink]

Thanks for reporting @mervynzhang this is a known issue at the moment and is something we are working on!

[zy11yz]

Please expedite the implementation of this feature, we urgently need to handle data with evolving schemas. thanks