2010YOUY01 opened a new pull request, #16880:
URL: https://github.com/apache/datafusion/pull/16880
## Which issue does this PR close?
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## Rationale for this change
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My local dev branch triggers a heisenbug:
```
cargo test --features backtrace --test sqllogictests
```
The error message said the csv file (the temporary file created inside .slt)
does not exist
```
1. query failed: DataFusion error: Internal error: Error encountered while
finalizing writes! Partial results may have been written to ObjectStore!.
This issue was likely caused by a bug in DataFusion's code. Please help us
to resolve this by filing a bug report in our issue tracker:
https://github.com/apache/datafusion/issues
[SQL] COPY (values (1), (2), (3), (4), (5)) TO
'test_files/scratch/limit/t1.csv'
STORED AS CSV
at
/Users/yongting/Code/datafusion/datafusion/sqllogictest/test_files/joins.slt:4259
2. query failed: DataFusion error: Object Store error: Object at location
/Users/yongting/Code/datafusion/datafusion/sqllogictest/test_files/scratch/limit/t1.csv
not found: No such file or directory (os error 2)
[SQL] select * from t1 LEFT JOIN t2 ON t1.a = t2.b LIMIT 2;
at
/Users/yongting/Code/datafusion/datafusion/sqllogictest/test_files/joins.slt:4281
3. query failed: DataFusion error: Object Store error: Object at location
/Users/yongting/Code/datafusion/datafusion/sqllogictest/test_files/scratch/limit/t1.csv
not found: No such file or directory (os error 2)
[SQL] select * from t1 LEFT JOIN t2 ON t1.a = t2.b LIMIT 2;
at
/Users/yongting/Code/datafusion/datafusion/sqllogictest/test_files/joins.slt:4289
...
```
My guess for the reason is, the test in `joins.slt` is creating tmp file
under `limit/` folder, and the `limit.slt` test file will also write to the
same folder.
My local change triggered a specific timing that caused two test runners to
write to the same scratch folder concurrently, resulting in a collision. I
tried using a separate scratch subfolder, and the error went away.
(Even if that's not the root cause, I believe having each test file use a
scratch folder with the same name is a more idiomatic approach.)
## What changes are included in this PR?
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Change the scratch test file created by `joins.slt` to be under `joins/`
subfolder, to avoid such collision.
## Are these changes tested?
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## Are there any user-facing changes?
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