crepererum opened a new pull request, #16669:
URL: https://github.com/apache/datafusion/pull/16669
## Which issue does this PR close?
Fixes #14141.
## Rationale for this change
When a reserved function like `user` is called without parenthesis, it may
as well be a column. This works in PostgreSQL for example:
```text
psql (17.5 (Debian 17.5-1.pgdg120+1))
Type "help" for help.
postgres=# create table t(a int, "user" text);
CREATE TABLE
postgres=# insert into t values (1, 'foo');
INSERT 0 1
postgres=# select t.user from t;
user
------
foo
(1 row)
postgres=# select user from t;
user
----------
postgres
(1 row)
```
However sqlparser tries to detect these functions, see
https://github.com/apache/datafusion-sqlparser-rs/issues/1909
## What changes are included in this PR?
We now first try to use the respective function and then also consider
columns.
## Are these changes tested?
More sqllogictests
## Are there any user-facing changes?
More queries work as expected (IMHO).
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