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Is your feature request related to a problem or challenge?
Based on the review #5709 (review) it is ideal to make an end to end reproducer for zero column batch issues (either with SQL or with the DataFrame API) It would be nice to ensure there aren't other issues with creating zero column batches.
We have found two execs so far that return an Err ArrowError(InvalidArgumentError("must either specify a row count or at least one column")) with no column #4911#5701
I suspect there are other exec may have the same issue.
Describe the solution you'd like
Need to find a good method to project empty-column relation (with non-empty row),
Describe alternatives you've considered
No response
Additional context
No response
The text was updated successfully, but these errors were encountered:
One classic list of things to test is Filter, Projection, Grouping, Join, and Window, and Limit. I am not sure how far we should go with this
BTW is one potential "end to end" test for zero column batches and LIMIT (maybe someone could just put this into slt file, following the model of @Jefffrey in #7945)
Adding some simple variations with GROUP BY and JOIN could also help
❯ create table t asvalues (1, 2), (3, 4);
0 rows inset. Query took 0.002 seconds.
❯ select* except (column1, column2) from t ;
++++++2 rows inset. Query took 0.001 seconds.
❯ select* except (column1, column2) from t limit1;
++++++1 row inset. Query took 0.000 seconds.
Is your feature request related to a problem or challenge?
Based on the review #5709 (review) it is ideal to make an end to end reproducer for zero column batch issues (either with SQL or with the DataFrame API) It would be nice to ensure there aren't other issues with creating zero column batches.
We have found two execs so far that return an Err ArrowError(InvalidArgumentError("must either specify a row count or at least one column")) with no column #4911 #5701
I suspect there are other exec may have the same issue.
Describe the solution you'd like
Need to find a good method to project empty-column relation (with non-empty row),
Describe alternatives you've considered
No response
Additional context
No response
The text was updated successfully, but these errors were encountered: