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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2021/06/23 16:49:17 UTC
[GitHub] [arrow-datafusion] rdettai opened a new issue #612: Illegal projection on empty columns
rdettai opened a new issue #612:
URL: https://github.com/apache/arrow-datafusion/issues/612
**Describe the bug**
When the using an empty table (no column), a query like `select * from empty_table` fails.
**To Reproduce**
```Rust
let mut ctx = ExecutionContext::new();
let empty_table = Arc::new(EmptyTable::new(Arc::new(Schema::empty())));
ctx.register_table("test_tbl", empty_table).unwrap();
let sql = "SELECT * FROM test_tbl";
let result = plan_and_collect(&mut ctx, sql)
.await
.expect("Query empty table");
```
**Expected behavior**
Returns an empty table
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[GitHub] [arrow-datafusion] alamb commented on issue #612: Illegal projection on empty columns
Posted by GitBox <gi...@apache.org>.
alamb commented on issue #612:
URL: https://github.com/apache/arrow-datafusion/issues/612#issuecomment-867166418
> fwiw, I am also getting this on master locally by running the tests.
I have filed https://github.com/apache/arrow-datafusion/issues/614 -- and I will try to look into it tomorrow
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[GitHub] [arrow-datafusion] alamb commented on issue #612: Illegal projection on empty columns
Posted by GitBox <gi...@apache.org>.
alamb commented on issue #612:
URL: https://github.com/apache/arrow-datafusion/issues/612#issuecomment-867025211
@rdettai I wonder if something is different about the hash partitioning that is happening locally -- I wonder does the problem go away if you do `cargo update`?
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[GitHub] [arrow-datafusion] Dandandan closed issue #612: Illegal projection on empty columns
Posted by GitBox <gi...@apache.org>.
Dandandan closed issue #612:
URL: https://github.com/apache/arrow-datafusion/issues/612
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[GitHub] [arrow-datafusion] jorgecarleitao commented on issue #612: Illegal projection on empty columns
Posted by GitBox <gi...@apache.org>.
jorgecarleitao commented on issue #612:
URL: https://github.com/apache/arrow-datafusion/issues/612#issuecomment-867065475
fwiw, I am also getting this on master locally by running the tests.
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[GitHub] [arrow-datafusion] rdettai commented on issue #612: Illegal projection on empty columns
Posted by GitBox <gi...@apache.org>.
rdettai commented on issue #612:
URL: https://github.com/apache/arrow-datafusion/issues/612#issuecomment-867008993
Locally, I have a test that has nothing to do with this change that is failing:
- physical_plan::repartition::tests::repartition_with_dropping_output_stream
```
---- physical_plan::repartition::tests::repartition_with_dropping_output_stream stdout ----
Running case RoundRobinBatch(2)
BarrierExec::wait waiting on barrier
Partition 0 waiting on barrier
Partition 1 waiting on barrier
Partition 1 sending batch
Partition 1 sending batch
Partition 0 sending batch
Partition 0 sending batch
BarrierExec::wait done waiting
Running case Hash([Column { name: "my_awesome_field", index: 0 }], 2)
BarrierExec::wait waiting on barrier
Partition 0 waiting on barrier
Partition 1 waiting on barrier
Partition 1 sending batch
Partition 1 sending batch
Partition 0 sending batch
Partition 0 sending batch
BarrierExec::wait done waiting
thread 'physical_plan::repartition::tests::repartition_with_dropping_output_stream' panicked at 'assertion failed: `(left == right)`
left: `["+------------------+", "| my_awesome_field |", "+------------------+", "| frob |", "+------------------+"]`,
right: `["+------------------+", "| my_awesome_field |", "+------------------+", "| foo |", "| frob |", "| gar |", "| gaz |", "| goo |", "| grob |", "+------------------+"]`:
expected:
[
"+------------------+",
"| my_awesome_field |",
"+------------------+",
"| frob |",
"+------------------+",
]
actual:
[
"+------------------+",
"| my_awesome_field |",
"+------------------+",
"| foo |",
"| frob |",
"| gar |",
"| gaz |",
"| goo |",
"| grob |",
"+------------------+",
]
', datafusion/src/physical_plan/repartition.rs:799:13
```
Any idea why that might be @alamb ?
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