session: fix the duplicate binding case when updating bind info (ping…

…cap#22367) (pingcap#22368)

Signed-off-by: ti-srebot <ti-srebot@pingcap.com>

store/tikv: fix a concurrency bug that may cause the batchClient time…

…out (pingcap#22239) (pingcap#22337)

Signed-off-by: ti-srebot <ti-srebot@pingcap.com>

planner: the issue that incorrect result is returned for indeterminis…

…tic function when executing a prepared point-get update. (pingcap#21883)

txn: fix the resolved txn status cache for pessimistic txn(pingcap#21689

) (pingcap#21706)

planner: disable index merge join temporarily (pingcap#20599)

config: disable query feedback by default. (pingcap#20179)

tikv: remove the update leader backoff (pingcap#17541) (pingcap#19764)

* cherry pick pingcap#17541 to release-3.0

Signed-off-by: ti-srebot <ti-srebot@pingcap.com>

Revert "*: using standard error to replace terror (pingcap#19425)" (p…

…ingcap#19945)

executor: reset kvRange in TableReaderExec.Close (pingcap#19447) (pin…

…gcap#19470)

Signed-off-by: ti-srebot <ti-srebot@pingcap.com>

planner: invalidate cached plan if no UnionScan for tables that need …

…it (pingcap#15429) (pingcap#19274)

Co-authored-by: Kenan Yao <cauchy1992@gmail.com>