andygrove opened a new issue #235:
URL: https://github.com/apache/arrow-datafusion/issues/235
**Describe the bug**
```
---- left_join_using stdout ----
thread 'left_join_using' panicked at 'assertion failed: `(left == right)`
left: `[["11", "a", "z"], ["22", "b", "y"], ["33", "c", "NULL"], ["44",
"d", "x"]]`,
right: `[["11", "a", "z"], ["22", "b", "y"], ["44", "d", "x"]]`',
datafusion/tests/sql.rs:1252:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
---- left_join stdout ----
thread 'left_join' panicked at 'assertion failed: `(left == right)`
left: `[["11", "a", "z"], ["22", "b", "y"], ["33", "c", "NULL"], ["44",
"d", "x"]]`,
right: `[["11", "a", "z"], ["22", "b", "y"], ["44", "d", "x"]]`',
datafusion/tests/sql.rs:1221:5
```
**To Reproduce**
Checkout commit `c945b03f3a459a5c15f481f9d52819df56e1090c` and run `cargo
test`.
**Expected behavior**
Tests should pass.
**Additional context**
Running on my 24 core desktop so perhaps this uncovers a race condition?
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