[GitHub] [arrow] AlenkaF commented on issue #13177: [Python] Reading JSON with explicit schema is ignoring not null constraint

[GitBox <gi...@apache.org>]

AlenkaF commented on issue #13177:
URL: https://github.com/apache/arrow/issues/13177#issuecomment-1129639709

   Hi @Kowol, thank you for reporting this issue!
   This should work and it doesn't - I created a JIRA issue [ARROW-16603](https://issues.apache.org/jira/browse/ARROW-16603) to correct this behaviour.
   
   A (not very nice) workaround could be to go through `pydict` and then back to `pa.Table` again:
   
   ```python
   In [16]: middle = table.to_pydict()
   
   In [17]: pa.Table.from_pydict(middle, schema=schema)
   Out[17]: 
   pyarrow.Table
   id: string not null
   nested: struct<value: int64 not null>
     child 0, value: int64 not null
   ----
   id: [["value"]]
   nested: [
     -- is_valid: all not null
     -- child 0 type: int64
   [1]]
   ```


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