englefly opened a new pull request, #16442:
URL: https://github.com/apache/doris/pull/16442
# Proposed changes
For performance reason, we want to remove constant column from groupingExprs.
For example: `select 'abc', sum(a) from t group by 'abc'` is equivalent to
`select 1, sum(a) from t`
We can remove constant column `abc` from groupingExprs.
But there is an exception:
sql1: `select 'abc' from t group by 'abc'`
sql2: `select 'abc' from t`
sql1 is not equivalent to sql2.
We need to keep some constant column if all items in groupingExprs are
constant columns.
Consider sql3 `select a from (select "abc" as a, 'def' as b) T group by b,
a;`
if the column is in select list, this column should not be removed.
Issue Number: close #xxx
## Problem summary
Describe your changes.
## Checklist(Required)
1. Does it affect the original behavior:
- [ ] Yes
- [ ] No
- [ ] I don't know
2. Has unit tests been added:
- [ ] Yes
- [ ] No
- [ ] No Need
3. Has document been added or modified:
- [ ] Yes
- [ ] No
- [ ] No Need
4. Does it need to update dependencies:
- [ ] Yes
- [ ] No
5. Are there any changes that cannot be rolled back:
- [ ] Yes (If Yes, please explain WHY)
- [ ] No
## Further comments
If this is a relatively large or complex change, kick off the discussion at
[[email protected]](mailto:[email protected]) by explaining why you
chose the solution you did and what alternatives you considered, etc...
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