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releases, readme: add the release notes for 2.0.3 #481

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releases, readme: add the release notes for 2.0.3 #481

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1 change: 1 addition & 0 deletions README.md
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Expand Up @@ -125,6 +125,7 @@
- [Frequently Asked Questions (FAQ)](FAQ.md)
- [TiDB Best Practices](https://pingcap.github.io/blog/2017/07/24/tidbbestpractice/)
+ [Releases](releases/rn.md)
- [2.0.3](releases/203.md)
- [2.0.2](releases/202.md)
- [2.0.1](releases/201.md)
- [2.0](releases/2.0ga.md)
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37 changes: 37 additions & 0 deletions releases/203.md
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---
title: TiDB 2.0.3 Release Notes
category: Releases
---

# TiDB 2.0.3 Release Notes

On June 1, 2018, TiDB 2.0.3 is released. Compared with TiDB 2.0.2, this release has great improvement in system compatibility and stability.

## TiDB

- Support modifying the log level online
- Support the `COM_CHANGE_USER` command
- Support using the `TIME` type parameters under the binary protocol
- Optimize the cost estimation of query conditions with the `BETWEEN` expression
- Do not display the `FOREIGN KEY` information in the result of `SHOW CREATE TABLE`
- Optimize the cost estimation for queries with the `LIMIT` clause
- Fix the issue about the `YEAR` type as the unique index
- Fix the issue about `ON DUPLICATE KEY UPDATE` in conditions without the unique index
- Fix the compatibility issue of the `CEIL` function
- Fix the accuracy issue of the `DIV` calculation in the `DECIMAL` type
- Fix the false alarm of `ADMIN CHECK TABLE`
- Fix the panic issue of `MAX`/`MIN` under specific expression parameters
- Fix the issue that the result of `JOIN` is null in special conditions
- Fix the `IN` expression issue when building and querying Range
- Fix a Range calculation issue when using `Prepare` to query and `Plan Cache` is enabled
- Fix the issue that the Schema information is frequently loaded in abnormal conditions

## PD

- Fix the panic issue when collecting hot-cache metrics in specific conditions
- Fix the issue about scheduling of the obsolete Regions

## TiKV

- Fix the bug that the learner flag mistakenly reports to PD
- Report an error instead of getting a result if `divisor/dividend` is 0 in `do_div_mod`
1 change: 1 addition & 0 deletions releases/rn.md
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Expand Up @@ -5,6 +5,7 @@ category: release

# TiDB Release Notes

- [2.0.3](203.md)
- [2.0.2](202.md)
- [2.0.1](201.md)
- [2.0](2.0ga.md)
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