chunyang commented on pull request #17100:
URL: https://github.com/apache/beam/pull/17100#issuecomment-1075505398
The error appears to be due to the temp dataset being deleted before the
table schema is read. I can move the table schema retrieval back into
`_export_files` so that it returns the `schema, metadata_list` tuple again, for
example,
```python
self.export_schema, self.export_metadata_list = self._export_files(bq)
```
The problem here is that `self.export_schema` is not picklable.
```
[...]
apache_beam/coders/coder_impl.py:272: in decode_from_stream
return self._decoder(stream.read_all(nested))
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _
self = [], sequence = [<TableFieldSchema
fields: []
mode: 'NULLABLE'
name: 'f0_'
type: 'INTEGER'>]
def extend(self, sequence):
"""Validate extension of list."""
> self.__field.validate(sequence)
E AttributeError: 'FieldList' object has no attribute
'_FieldList__field'
```
@aaltay I saw you ran into the same issue previously here?
https://github.com/google/apitools/pull/311 Did you have a workaround? AFAICT a
newer version of apitools was never released.
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