WinkerDu opened a new issue #2141:
URL: https://github.com/apache/arrow-datafusion/issues/2141
**Is your feature request related to a problem or challenge? Please describe
what you are trying to do.**
df now has not implemented `StringConcat` operator, like
```
❯ select 'aa' || 'b';
NotImplemented("Unsupported SQL binary operator StringConcat")
```
But Postgres SQL will come out results lile
```
select 'aa' || 'b';
?column?
----------
aab
(1 row)
```
**Describe the solution you'd like**
Reuse df build-in `concat` string expression to do it.
**Describe alternatives you've considered**
No.
**Additional context**
No.
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