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CHANGELOG: Add changelog for 2.0.5 #7005

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Jul 6, 2018
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CHANGELOG: Add changelog for 2.0.5 #7005

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CHANGELOG: Add changelog for 2.0.5
shenli Jul 6, 2018
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shenli Jul 6, 2018
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shenli Jul 6, 2018
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22 changes: 22 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -2,6 +2,28 @@

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/pingcap/tikv/blob/master/CHANGELOG.md) and [PD changelog](https://github.com/pingcap/pd/blob/master/CHANGELOG.md).

## [2.0.5] - 2018-07-06
### New Features
- Add the `tidb_disable_txn_auto_retry` system variable, used to disable the automatic retry of transactions #6877
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Do we need to change the plain test #6877 to a link #6867. Or just remove it?

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"which is used to disable xxx"?

### Improvements
- Optimize the cost calculation of `Selection` to make the result more accurate #6989
- Select the query condition that completely matches the unique index or the primary key as the query path directly #6966
- Execute necessary cleanup when failing to start the service #6964
- Handle `\N` as NULL in the `Load Data` statement #6962
- Optimize the code structure of COB #6953
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COB -> CBO

- Report the monitoring metrics earlier when starting the service #6931
- Optimize the format of slow queries by removing the line breaks in SQL statements and adding user information #6920
- Support multiple asterisks in comments #6858
### Bug Fixes
- Fix the issue that `KILL QUERY` always requires SUPER privilege #7003
- Fix the issue that users might fail to login when the number of users exceeds 1024 #6986
- Fix an issue about inserting unsigned `float`/`double` data #6929
- Fix the compatibility of the `COM_FIELD_LIST` command to resolve the panic issue in some MariaDB clients #6929
- Fix the `CREATE TABLE IF NOT EXISTS LIKE` behavior #6928
- Fix an issue in the process of TopN pushdown #6923
- Fix the ID record issue of the currently processing row when an error occurs in executing `Add Index` #6903


## [2.0.4] - 2018-06-15
### New Features
- Support the `ALTER TABLE t DROP COLUMN a CASCADE` syntax
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