alamb commented on issue #6508:
URL:
https://github.com/apache/arrow-datafusion/issues/6508#issuecomment-1572597041
Thanks for the report @osawyerr
TLDR is that DataFusion treats `VARCHAR` and `CHAR` the same (because they
use the same underlying Arrow type)
🤔 I am not quite sure what to do here. Postgres has the notion of a max
width character column `CHAR` but arrow does not . DataFusion maps the SQL type
`CHAR` --> arrow type `Utf8`
Thus I am no sure we were be able to replicate the behavior of postgres in
this instance.
For anyone following along, here is what postgres does
```sql
postgres=# create table example(name varchar(20));
CREATE TABLE
postgres=# insert into example values ('foo'), ('barrr');
INSERT 0 2
postgres=# select octet_length(name) from example;
octet_length
--------------
3
5
(2 rows)
postgres=# select octet_length(name::char(25)) from example;
octet_length
--------------
25
25
(2 rows)
postgres=# select octet_length(name::varchar(25)) from example;
octet_length
--------------
3
5
(2 rows)
postgres=#
```
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