[cherry-pick][fix](planner) fix hll_union plan: Invalid Aggregate Operator: hll_union (#14931)

[zenoyang]

Proposed changes

Issue Number: close #14931
When using hll_union aggregate function, PREAGGREGATION is always OFF and Rollup cannot be hit.

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 dev@doris.apache.org by explaining why you chose the solution you did and what alternatives you considered, etc...

[morningman]

LGTM