Jimexist opened a new issue #671:
URL: https://github.com/apache/arrow-datafusion/issues/671
**Describe the bug**
A clear and concise description of what the bug is.
this is most likely on how we deal with self-joins
**To Reproduce**
Steps to reproduce the behavior:
```sql
SELECT
t1.c9, t2.c9
FROM test t1
INNER JOIN test t2
ON t1.c9 = t2.c9;
```
```
thread 'main' panicked at 'index out of bounds: the len is 1 but the index
is 1',
~/.cargo/registry/src/github.com-1ecc6299db9ec823/arrow-4.4.0/src/datatypes/schema.rs:165:10
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
```
**Expected behavior**
A clear and concise description of what you expected to happen.
**Additional context**
Add any other context about the problem here.
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