wangxiaoying opened a new issue, #2265:
URL: https://github.com/apache/arrow-datafusion/issues/2265
**Is your feature request related to a problem or challenge? Please describe
what you are trying to do.**
Currently when the sql query contains `is not true/false`, the following
error will be thrown:
```
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value:
SQL(ParserError("Expected [NOT] NULL or [NOT] DISTINCT FROM after IS, found:
NOT"))'
```
**Describe the solution you'd like**
`col is not true(false)` should have the same result with `col is NULL or
col = false(true)`. For example in postgres, it works like follow:
<img width="720" alt="image"
src="https://user-images.githubusercontent.com/5569610/163853092-79e660d7-13d6-4bff-801f-cc83034ab577.png";>
**Describe alternatives you've considered**
A clear and concise description of any alternative solutions or features
you've considered.
**Additional context**
It looks like the error happens when parsing the query at
[here](https://github.com/sqlparser-rs/sqlparser-rs/blob/main/src/parser.rs#L1116).
Might need to support this syntax in `sqlparser` first.
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