add releasenotes-1.4.0.md
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# Release 1.4.0
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## Key Features
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| Area | Feature |
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| ---------------- | ------------------------------------------------------------ |
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| Star Tree | 1. Update APIs to support creating star tree cube for jdbc connectors<br/>2. Implemented support for Clickhouse connector, support for additional JDBC based connectors will be added in the future<br/>3. Bug fixes |
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| Heuristic Index | 1. Added support for UPDATE INDEX (see docs for details)<br/>2. Added index size, memory usage and disk usage info in SHOW INDEX<br/>3. Add mmap cache support for Bloom Index to reduce memory usage (enabled by default, see docs for details)<br/>4. Dropping a table will now also drop any indexes associated with it<br/>5. Index is now automatically load after creation (enabled by default, see docs for details) |
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| Memory Connector | Fixed several important bugs to handle large data sets, and address incorrect results that occasionally occur for specific operators. |
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| Task Recovery | Fixed several important bugs to address data inconsistency issues that occasionally occur during high concurrency, and during worker failures. |
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| OLK-on-Yarn | Support deploying an openLooKeng cluster on yarn. The openLooKeng cluster can be deployed with a single coordinator, and multiple workers. |
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| Low Latency | 1. Optimized the Stats calculation for point queries which don't contain join to speed up low latency queries<br/>2. Added adaptive split grouping to enhance high concurrency query throughput<br/>3. Support non-equality dynamic filters to speed up queries having predicates like <, >, <= & >= |
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| Kylin Connector | Support read operations to the Kylin datasource |
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## Known Issues
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| Category | Description | Gitee issue |
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| ------------- | ------------------------------------------------------------ | ------------------------------------------------------------ |
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| Task Recovery | Concurrent CTAS, some SQL statements report the error "HiveSplitSource is already closed." | [144QYL](https://e.gitee.com/open_lookeng/issues/list?issue=I44QYL) |
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| | An error occurs when the CTA creates a transaction table and inserts data"Unsuccessful query retry" | [I44RQJ](https://e.gitee.com/open_lookeng/issues/list?issue=I44RQJ) |
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| OLK-on-Yarn | Multiple small openLooKeng clusters are started in the Hadoop cluster, but all openLooKeng cluster processes are on the same node. As a result, the openLooKeng cluster fails to be started | [I4BP5A](https://e.gitee.com/open_lookeng/issues/list?issue=I4BP5A) |
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| | When multiple openLooKeng clusters are started, an error is reported when access some cluster CLI | [I4BY6Z](https://e.gitee.com/open_lookeng/issues/list?issue=I4BY6Z) |
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## Obtaining the Document
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For details, see [https://gitee.com/openlookeng/hetu-core/tree/1.4.0/hetu-docs/en](https://gitee.com/openlookeng/hetu-core/tree/1.4.0/hetu-docs/en)
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# Release 1.4.0
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## 关键特性
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| 分类 | 描述 |
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| --------------------- | ------------------------------------------------------------ |
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| Star Tree | 1. 更新APIs支持jdbc 连接器使用cube<br/>2. 支持Clickhouse连接器使用cube，其它jdbc connector在将来支持<br/>3. 问题修复 |
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| 启发式索引 | 1. 支持UPDATE INDEX（详细见文档）<br/>2. SHOW INDEX中增加index大小，内存和磁盘占用信息<br/>3. Bloom index增加nmap cache来减少内存使用（默认打开，详细见文档）<br/>4. 支持DROP TABLE同时删除index<br/>5. 支持创建index后自动加载index（默认打开，详细见文档） |
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| Memory 连接器 | 修复了几个重要的错误，以解决大型数据集和特定运算符偶尔发生的错误结果 |
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| Task Recovery | 修复了几个重要的错误，以解决高并发和worker节点故障期间偶尔发生的数据不一致问题 |
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| Yarn上部署openLooKeng | 支持Yarn上部署openLooKeng集群。当前支持部署单coordinator和多worker节点部署 |
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| 低时延 | 1. 优化不包含join的点查sql的stats计算，加快低时延查询的速度<br/>2. 新增自适应分片分组，提升高并发查询吞吐量<br/>3. 支持非等式动态筛选器，以加快具有<、>、<= & >=等谓词的查询速度 |
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| Kylin 连接器 | 支持对kylin数据源的读操作 |
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## 已知问题
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| 分类 | 描述 | Gitee问题 |
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| --------------------- | ------------------------------------------------------------ | ------------------------------------------------------------ |
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| Task Recovery | 并发CTAS，部分sql报错：“HiveSplitSource is already closed” | [144QYL](https://e.gitee.com/open_lookeng/issues/list?issue=I44QYL) |
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| | CTA创建事务表，插入数据报错“Unsuccessful query retry” | [I44RQJ](https://e.gitee.com/open_lookeng/issues/list?issue=I44RQJ) |
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| Yarn上部署openLooKeng | 启动多个openLooKeng小集群，containers会在相同的节点上启动，导致此节点资源会用完，新启openLooKeng集群失败（实际其它节点还有资源） | [I4BP5A](https://e.gitee.com/open_lookeng/issues/list?issue=I4BP5A) |
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| | 启动多个openLooKeng集群，部分集群进CLI报错 | [I4BY6Z](https://e.gitee.com/open_lookeng/issues/list?issue=I4BY6Z) |
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## 获取文档
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请参考： [https://gitee.com/openlookeng/hetu-core/tree/1.4.0/hetu-docs/zh](https://gitee.com/openlookeng/hetu-core/tree/1.4.0/hetu-docs/zh)
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