# Issue #55807: Planner doesn't rewrite conflict expressions to dual in `utf8mb4_general_ci` collation

## Metadata
- Issue: https://github.com/pingcap/tidb/issues/55807
- Status: open
- Type: type/enhancement
- Created At: 2024-09-03T02:32:08Z
- Labels: report/customer, sig/planner, type/enhancement

## Customer-Facing Phenomenon
- I think when collation_connetion equals to , the plan should also be

## Linked PRs
- No linked PR was found from the issue timeline.

## Notes
- This issue is still open. Use this file as a reminder list for customer-driven gaps that still need a fix or a completed rollout.