Jimexist opened a new issue #670:
URL: https://github.com/apache/arrow-datafusion/issues/670
**Describe the bug**
A clear and concise description of what the bug is.
with a join, we'd get false positive schema name collision
**To Reproduce**
Steps to reproduce the behavior:
this works:
```sql
SELECT
t1.c9 x
FROM test t1
INNER JOIN test t2
ON t1.c9 = t2.c9
ORDER BY x;
```
but this won't:
```sql
SELECT
t1.c9 x, t1.c1 c1
FROM test t1
INNER JOIN test t2
ON t1.c9 = t2.c9
ORDER BY x;
```
```
Plan("The left schema and the right schema have the following columns with
the same name without being on the ON statement: {Column { name: \"c1\", index:
0 }}. Consider aliasing them.")
```
**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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