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- When the `PREPARE` statement fails to hit the execution plan cache, TiDB enables you to view the reason by executing `SHOW WARNINGS`[#50407](https://github.com/pingcap/tidb/issues/50407) @[hawkingrei](https://github.com/hawkingrei)
- Improve the accuracy of query estimation information when the same row of data is updated multiple times [#47523](https://github.com/pingcap/tidb/issues/47523) @[terry1purcell](https://github.com/terry1purcell)
- Index Merge supports embedding multi-value indexes and `OR` operators in `AND` predicates [#51778](https://github.com/pingcap/tidb/issues/51778) @[time-and-fate](https://github.com/time-and-fate)
- (dup): release-7.1.4.md > Improvements> TiDB - When `force-init-stats` is set to `true`, TiDB waits for statistics initialization to finish before providing services during TiDB startup. This setting no longer blocks the startup of HTTP servers, which enables users to continue monitoring [#50854](https://github.com/pingcap/tidb/issues/50854) @[hawkingrei](https://github.com/hawkingrei)
