jackwener opened a new issue, #4556:
URL: https://github.com/apache/arrow-datafusion/issues/4556
**Describe the bug**
When I try to refactor the planner having, I find the `having` planner is
wrong.
1147 line in planner.rs
```rust
// This step "dereferences" any aliases in the HAVING clause.
```
In fact, `having` can't access the projection alias (because `having` is
before the `select`).
having is `just` filter group results, it can't get alias in projection.
for example:
```sql
-- create
CREATE TABLE EMPLOYEE (
empId INTEGER PRIMARY KEY,
name TEXT NOT NULL,
dept TEXT NOT NULL
);
-- insert
INSERT INTO EMPLOYEE VALUES (0001, 'Clark', 'Sales');
-- fetch
select empId, length(name) as l FROM EMPLOYEE group by empId having l > 10;
psql:commands.sql:15: ERROR: column "l" does not exist
LINE 1: ...ength(name) as l FROM EMPLOYEE group by empId having l > 10;
```
**To Reproduce**
Steps to reproduce the behavior:
**Expected behavior**
A clear and concise description of what you expected to happen.
**Additional context**
Add any other context about the problem here.
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