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release note: update feature description (#6325) #6327

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Aug 28, 2021
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release note: update feature description (#6325) #6327

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c942bfe
Update release-5.2.0.md
qiancai Aug 28, 2021
e15ba3a
Update release-5.2.0.md
qiancai Aug 28, 2021
a21f33e
Update release-5.2.0.md
qiancai Aug 28, 2021
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Update release-5.2.0.md
qiancai Aug 28, 2021
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Update release-5.2.0.md
@qiancai @ti-chi-bot
qiancai authored and ti-chi-bot committed Aug 28, 2021

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commit c942bfed293bf27004dd18fda939745bf2841d2b
5 changes: 2 additions & 3 deletions releases/release-5.2.0.md
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@@ -10,11 +10,10 @@ TiDB version: 5.2.0

In v5.2, the key new features and improvements are as follows:

- Support expression index to greatly improve query performance
- Support using several functions in expression indexes to greatly improve query performance
- Improve the accuracy of optimizer cardinality estimation to help to select optimal execution plans
- Announce the general availability (GA) for the Lock View feature to observe transaction locking events and troubleshoot deadlock problems
- Add the TiFlash I/O traffic limit feature to improve the stability of read and write for TiFlash
- Optimize TiKV reserving space management to improve the stability of storage
- TiKV introduces a new flow control mechanism to replace the previous RocksDB write stall mechanism to improve the stability of TiKV flow control
- Simplify the operation and maintenance of Data Migration (DM) to reduce the management cost.
- TiCDC supports HTTP protocol OpenAPI to manage TiCDC tasks. It provides a more user-friendly operation method for both Kubernetes and on-premises environments. (Experimental feature)
@@ -66,7 +65,7 @@ In v5.2, the key new features and improvements are as follows:

### SQL

- **Support expression index**
- **Support using several functions in expression indexes**

The expression index is a type of special index that can be created on an expression. After an expression index is created, TiDB supports expression-based queries, which greatly improves query performance.