JonasJ-ap commented on code in PR #7148:
URL: https://github.com/apache/iceberg/pull/7148#discussion_r1145513360


##########
python/pyproject.toml:
##########
@@ -100,6 +102,7 @@ build-backend = "poetry.core.masonry.api"
 pyarrow = ["pyarrow"]
 pandas = ["pandas", "pyarrow"]
 duckdb = ["duckdb", "pyarrow"]
+ray = ["ray", "pyarrow", "pandas"]

Review Comment:
   @Fokko Yes. The `pandas` seems to be a required dependency when converting 
from `pa.Table` to ray dataset. 
   
   Here is the trace when running `table.scan().to_ray()` without `pandas`:
   ```bash
   2023-03-22 19:22:32,946      INFO worker.py:772 -- Task failed with 
retryable exception: TaskID(c8ef45ccd0112571ffffffffffffffffffffffff01000000).
   (_get_metadata pid=77891) Traceback (most recent call last):
   (_get_metadata pid=77891)   File "python/ray/_raylet.pyx", line 857, in 
ray._raylet.execute_task
   (_get_metadata pid=77891)   File "python/ray/_raylet.pyx", line 861, in 
ray._raylet.execute_task
   (_get_metadata pid=77891)   File 
"/Users/jonasjiang/Library/Caches/pypoetry/virtualenvs/pyiceberg-oQQETec1-py3.9/lib/python3.9/site-packages/ray/data/read_api.py",
 line 1565, in _get_metadata
   (_get_metadata pid=77891)     return 
BlockAccessor.for_block(table).get_metadata(
   (_get_metadata pid=77891)   File 
"/Users/jonasjiang/Library/Caches/pypoetry/virtualenvs/pyiceberg-oQQETec1-py3.9/lib/python3.9/site-packages/ray/data/block.py",
 line 379, in for_block
   (_get_metadata pid=77891)     import pandas
   (_get_metadata pid=77891) ModuleNotFoundError: No module named 'pandas'
   ```
   Here is the reference for `for_block` method in ray:
   
https://github.com/ray-project/ray/blob/2e6de87ada84609fcd4f85bd16b9c2e090e921ae/python/ray/data/block.py#L379-L394
   
   The `import pandas` cause this requirement.



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