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CHANGELOG: add release notes for v2.1.6 #9747

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CHANGELOG: add release notes for v2.1.6 #9747

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CHANGELOG: add release notes for v2.1.6
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19 changes: 19 additions & 0 deletions CHANGELOG.md
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# TiDB Changelog
All notable changes to this project will be documented in this file. See also [Release Notes](https://github.com/pingcap/docs/blob/master/releases/rn.md), [TiKV Changelog](https://github.com/tikv/tikv/blob/master/CHANGELOG.md) and [PD Changelog](https://github.com/pingcap/pd/blob/master/CHANGELOG.md).

## [2.1.6] 2019-03-15

### SQL Optimizer/Executor
* Optimize planner to select the outer table based on cost when both tables are specified in Hint of `TIDB_INLJ` [#9615](https://github.com/pingcap/tidb/pull/9615)
* Fix the issue that `IndexScan` cannot be selected correctly in some cases
[#9587](https://github.com/pingcap/tidb/pull/9587)
* Fix incompatibility with MySQL of check in the `agg` function in subqueries [#9551](https://github.com/pingcap/tidb/pull/9551)
* Make `show stats_histograms` only output valid columns to avoid panics
[#9502](https://github.com/pingcap/tidb/pull/9502)
### Server
* Support the `log_bin` variable to enable/disable Binlog [#9634](https://github.com/pingcap/tidb/pull/9634)
* Add a sanity check for transactions to avoid false transaction commit [#9559](https://github.com/pingcap/tidb/pull/9559)
* Fix the issue that setting variables may lead to panic [#9539](https://github.com/pingcap/tidb/pull/9539)

### DDL
* Fix the issue that the `Create Table Like` statement causes panic in some cases [#9652](https://github.com/pingcap/tidb/pull/9652)
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* Enable the `AutoSync` feature of etcd clients to avoid connection issues between TiDB and etcd in some cases [#9600](https://github.com/pingcap/tidb/pull/9600)


## [2.1.5] 2019-02-28

### SQL Optimizer/Executor
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