[Python] Converting empty table to batch results in empty list

[AlenkaF]

Describe the bug, including details regarding any error messages, version, and platform.

When converting an empty table with a known schema to a record batch, the information about the schema is lost and the result is an empty list:

>>> my_schema = pa.schema([pa.field('col1', pa.int64())])
>>> df = pa.table([[]], schema=my_schema)
>>> df
pyarrow.Table
col1: int64
----
col1: [[]]
>>> df.to_batches()
[]

but in comparison, if we are creating an empty batch with a known schema we get the following:

>>> batch = pa.record_batch([[]], schema=my_schema)
>>> batch
pyarrow.RecordBatch
col1: int64
----
col1: []

and I think this should be same for the case of converting an empty table with known schema to a record batch.

Component(s)

Python

[AlenkaF]

Closing this as there is not a clear idea what to do in cases of empty tables with (can be multiple) empty chunks. Can reopen in future if we see the need to do so.