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Jun 15, 2018
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releases, readme: add the release notes for 2.0.4 #506

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releases, readme: add the release notes for 2.0.4
CaitinChen Jun 15, 2018
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Update 2.0.4
CaitinChen Jun 15, 2018
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1 change: 1 addition & 0 deletions README.md
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Expand Up @@ -128,6 +128,7 @@
- [Frequently Asked Questions (FAQ)](FAQ.md)
- [TiDB Best Practices](https://pingcap.github.io/blog/2017/07/24/tidbbestpractice/)
+ [Releases](releases/rn.md)
- [2.0.4](releases/204.md)
- [2.0.3](releases/203.md)
- [2.0.2](releases/202.md)
- [2.0.1](releases/201.md)
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41 changes: 41 additions & 0 deletions releases/204.md
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---
title: TiDB 2.0.4 Release Notes
category: Releases
---

# TiDB 2.0.4 Release Notes

On June 15, 2018, TiDB 2.0.4 is released. Compared with TiDB 2.0.3, this release has great improvement in system compatibility and stability.

## TiDB

- Support the `ALTER TABLE t DROP COLUMN a CASCADE` syntax
- Support configuring the value of `tidb_snapshot` to TSO
- Refine the display of statement types in monitoring items
- Optimize the accuracy of query cost estimation
- Configure the `backoff max delay` parameter of gRPC
- Support configuring the memory threshold of a single statement in the configuration file
- Refactor the error of Optimizer
- Fix the side effects of the `Cast Decimal` data
- Fix the wrong result issue of the `Merge Join` operator in specific scenarios
- Fix the issue of converting the Null object to String
- Fix the issue of casting the JSON type of data to the JSON type
- Fix the issue that the result order is not consistent with MySQL in the condition of `Union` + `OrderBy`
- Fix the compliance rules issue when the `Union` statement checks the `Limit/OrderBy` clause
- Fix the compatibility issue of the `Union All` result
- Fix a bug in predicate pushdown
- Fix the compatibility issue of the `Union` statement with the `For Update` clause
- Fix the issue that the `concat_ws` function mistakenly truncates the result

## PD

- Improve the behavior of the unset scheduling argument `max-pending-peer-count` by changing it to no limit for the maximum number of `PendingPeer`s

## TiKV

- Add the RocksDB `PerfContext` interface for debugging
- Remove the `import-mode` parameter
- Add the `region-properties` command for `tikv-ctl`
- Fix the issue that `reverse-seek` is slow when many RocksDB tombstones exist
- Fix the crash issue caused by `do_sub`
- Make GC record the log when GC encounters many versions of data
3 changes: 2 additions & 1 deletion releases/rn.md
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---

# TiDB Release Notes


- [2.0.4](204.md)
- [2.0.3](203.md)
- [2.0.2](202.md)
- [2.0.1](201.md)
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