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add changelog for 2.1.0 rc4 (#8020) #8027

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Oct 23, 2018
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add changelog for 2.1.0 rc4 (#8020) #8027

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33 changes: 32 additions & 1 deletion 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).

## [2.1.0-rc.4] - 2018-10-23
### SQL Optimizer
* Fix the issue that column pruning of `UnionAll` is incorrect in some cases [#7941](https://github.com/pingcap/tidb/pull/7941)
* Fix the issue that the result of the `UnionAll` operator is incorrect in some cases [#8007](https://github.com/pingcap/tidb/pull/8007)
### SQL Execution Engine
* Fix the precision issue of the `AVG` function [#7874](https://github.com/pingcap/tidb/pull/7874)
* Support using the `EXPLAIN ANALYZE` statement to check the runtime statistics including the execution time and the number of returned rows of each operator during the query execution process [#7925](https://github.com/pingcap/tidb/pull/7925)
* Fix the panic issue of the `PointGet` operator when a column of a table appears multiple times in the result set [#7943](https://github.com/pingcap/tidb/pull/7943)
* Fix the panic issue caused by too large values in the `Limit` subclause [#8002](https://github.com/pingcap/tidb/pull/8002)
* Fix the panic issue during the execution process of the `AddDate`/`SubDate` statement in some cases [#8009](https://github.com/pingcap/tidb/pull/8009)
### Statistics
* Fix the issue of judging the prefix of the histogram low-bound of the combined index as out of range [#7856](https://github.com/pingcap/tidb/pull/7856)
* Fix the memory leak issue caused by statistics collecting [#7873](https://github.com/pingcap/tidb/pull/7873)
* Fix the panic issue when the histogram is empty [#7928](https://github.com/pingcap/tidb/pull/7928)
* Fix the issue that the histogram bound is out of range when the statistics is being uploaded [#7944](https://github.com/pingcap/tidb/pull/7944)
* Limit the maximum length of values in the statistics sampling process [#7982](https://github.com/pingcap/tidb/pull/7982)
### Server
* Refactor Latch to avoid misjudgment of transaction conflicts and improve the execution performance of concurrent transactions [#7711](https://github.com/pingcap/tidb/pull/7711)
* Fix the panic issue caused by collecting slow queries in some cases [#7874](https://github.com/pingcap/tidb/pull/7847)
* Fix the panic issue when `ESCAPED BY` is an empty string in the `LOAD DATA` statement [#8005](https://github.com/pingcap/tidb/pull/8005)
* Complete the “coprocessor error” log information [#8006](https://github.com/pingcap/tidb/pull/8006)
### Compatibility
* Set the `Command` field of the `SHOW PROCESSLIST` result to `Sleep` when the query is empty [#7839](https://github.com/pingcap/tidb/pull/7839)
### Expressions
* Fix the constant folding issue of the `SYSDATE` function [#7895](https://github.com/pingcap/tidb/pull/7895)
* Fix the issue that `SUBSTRING_INDEX` panics in some cases [#7897](https://github.com/pingcap/tidb/pull/7897)
### DDL
* Fix the stack overflow issue caused by throwing the `invalid ddl job type` error [#7958](https://github.com/pingcap/tidb/pull/7958)
* Fix the issue that the result of `ADMIN CHECK TABLE` is incorrect in some cases [#7975](https://github.com/pingcap/tidb/pull/7975)


## [2.1.0-rc.2] - 2018-09-14
### SQL Optimizer
* Put forward a proposal of the next generation Planner [#7543](https://github.com/pingcap/tidb/pull/7543)
Expand All @@ -15,7 +46,7 @@ All notable changes to this project will be documented in this file. See also [R
* Optimize the performance of Hash aggregate operators [#7541](https://github.com/pingcap/tidb/pull/7541)
* Optimize the performance of Join operators [#7493](https://github.com/pingcap/tidb/pull/7493), [#7433](https://github.com/pingcap/tidb/pull/7433)
* Fix the issue that the result of `UPDATE JOIN` is incorrect when the Join order is changed [#7571](https://github.com/pingcap/tidb/pull/7571)
* Improve the performance of Chunk’s iterator [#7585](https://github.com/pingcap/tidb/pull/7585)
* Improve the performance of Chunk’s iterator [#7585](https://github.com/pingcap/tidb/pull/7585)
### Statistics
* Fix the issue that the auto Analyze work repeatedly analyzes the statistics [#7550](https://github.com/pingcap/tidb/pull/7550)
* Fix the statistics update error that occurs when there is no statistics change [#7530](https://github.com/pingcap/tidb/pull/7530)
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