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# Build Strong Real-Time Streaming Apps with Apache Calcite
![Calcite](https://www.linux.com/sites/lcom/files/styles/rendered_file/public/calcite.jpg?itok=CUZmjPjy "Calcite ")
Calcite is a data framework that lets you to build custom database functionality, explains Microsoft developer Atri Sharma in this preview to his upcoming talk at Apache: Big Data Europe, Nov. 14-16 in Seville, Spain.[Creative Commons Zero][2]Wikimedia Commons: Parent Géry
The [Apache Calcite][7] data management framework contains many pieces of a typical database management system but omits others, such as storage of data and algorithms to process data. In his talk at the upcoming [Apache: Big Data][6] conference in Seville, Spain, Atri Sharma, a Software Engineer for Azure Data Lake at Microsoft, will talk about developing applications using [Apache Calcite][5]'s advanced query planning capabilities. We spoke with Sharma to learn more about Calcite and how existing applications can take advantage of its functionality.
![Atri Sharma](https://www.linux.com/sites/lcom/files/styles/floated_images/public/atri-sharma.jpg?itok=77cvZWfw "Atri Sharma")
Atri Sharma, Software Engineer, Azure Data Lake, Microsoft[Used with permission][1]
**Linux.com: Can you provide some background on Apache Calcite? What does it do?**
Atri Sharma: Calcite is a framework that is the basis of many database kernels. Calcite empowers you to build your custom database functionality and use the required resources from Calcite. For example, Hive uses Calcite for cost-based query optimization, Drill and Kylin use Calcite for SQL parsing and optimization, and Apex uses Calcite for streaming SQL.
**Linux.com: What are some features that make Apache Calcite different from other frameworks?**
Atri: Calcite is unique in the sense that it allows you to build your own data platform. Calcite does not manage your data directly but rather allows you to use Calcite's libraries to define your own components. For eg, instead of providing a generic query optimizer, it allows defining custom query optimizers using the Planners available in Calcite.
**Linux.com: Apache Calcite itself does not store or process data. How does that affect application development?**
Atri: Calcite is a dependency in the kernel of your database. It is targeted for data management platforms that wish to extend their functionalities without writing a lot of functionality from scratch.
**Linux.com: Who should be using it? Can you give some examples?**
Atri: Any data management platform looking to extend their functionalities should use Calcite. We are the foundation of your next high-performance database!
Specifically, I think the biggest examples would be Hive using Calcite for query optimization and Flink for parsing and streaming SQL processing. Hive and Flink are full-fledged data management engines, and they use Calcite for highly specialized purposes. This is a good case study for applications of Calcite to further strengthen the core of a data management platform.
**Linux.com: What are some new features that you’re looking forward to?**
Atri: Streaming SQL enhancements are something I am very excited about. These features are exciting because they will enable users of Calcite to develop real-time streaming applications much faster, and the strength and capabilities of these applications will be manifold. Streaming applications are the new de facto, and the strength to have query optimization in streaming SQL will be very useful for a large crowd. Also, there is discussion ongoing about temporal tables, so watch out for more!
--------------------------------------------------------------------------------
via: https://www.linux.com/news/build-strong-real-time-streaming-apps-apache-calcite
作者：[AMBER ANKERHOLZ][a]
译者：[译者ID](https://github.com/译者ID)
校对：[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 组织编译，[Linux中国](https://linux.cn/) 荣誉推出
[a]:https://www.linux.com/users/aankerholz
[1]:https://www.linux.com/licenses/category/used-permission
[2]:https://www.linux.com/licenses/category/creative-commons-zero
[3]:https://www.linux.com/files/images/atri-sharmajpg
[4]:https://www.linux.com/files/images/calcitejpg
[5]:https://calcite.apache.org/
[6]:http://events.linuxfoundation.org/events/apache-big-data-europe
[7]:https://calcite.apache.org/

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# 用 Apache Calcite 构建强大的实时流应用
![Calcite](https://www.linux.com/sites/lcom/files/styles/rendered_file/public/calcite.jpg?itok=CUZmjPjy "Calcite ")
Calcite 是一个数据框架，它允许你创建自定义数据库功能，微软开发者 Atri Sharma 在 Apache 即将到来的 11 月 14-16 日在西班牙塞维利亚举行的 Big Data Europe 中解释。[Creative Commons Zero][2]
Wikimedia Commons: Parent Géry
[Apache Calcite][7] 数据管理框架包含许多典型的数据库管理系统，但省略了其他部分，如存储数据和算法来处理数据。 Microsoft 在 Azure Data Lake 的软件工程师 Atri Sharma 在西班牙塞维利亚的即将到来的 [Apache：Big Data][6] 会议上的演讲中将讨论使用 [Apache Calcite][5]的高级查询规划能力。我们与 Sharma 讨论了解有关 Calcite 的更多信息，以及现有程序如何利用其功能。
![Atri Sharma](https://www.linux.com/sites/lcom/files/styles/floated_images/public/atri-sharma.jpg?itok=77cvZWfw "Atri Sharma")
Atri Sharma，微软 Azure Data Lake 的软件工程师，已经[授权使用][1]
**Linux.com：你能提供一些关于 Apache Calcite 的背景吗？ 它有什么作用？
Atri Sharma：Calcite是一个框架，它是许多数据库内核的基础。Calcite 允许你构建自定义数据库功能并使用 Calcite 所需的资源。例如，Hive 使用 Calcite 进行基于成本的查询优化、Drill 和 Kylin 使用 Calcite 进行 SQL 解析和优化、Apex 使用 Calcite 进行流式 SQL。
**Linux.com：有哪些是使得 Apache Calcite 与其他框架不同的特性？
Atri：Calcite 是独一无二的，它允许你建立自己的数据平台。 Calcite 不直接管理你的数据，而是允许你使用 Calcite 的库来定义你自己的组件。 例如，它允许使用 Calcite 中可用的 Planner 定义自定义查询优化器，而不是提供通用查询优化器。
**Linux.com：Apache Calcite 本身不会存储或处理数据。 它如何影响程序开发？
Atri：Calcite 是数据库内核中的依赖项。它面向希望扩展其功能的数据管理平台，而无需从头开始编写大量功能。
** Linux.com：谁应该使用它？ 你能举几个例子吗？**
Atri：任何旨在扩展其功能的数据管理平台都应使用 Calcite。 我们是你下一个高性能数据库的基础！
具体来说，我认为最大的例子是 Hive 使用 Calcite 用于查询优化、Flink 解析和流 SQL 处理。 Hive 和 Flink 是成熟的数据管理引擎，并使用 Calcite 高度专业目的。这是对 Calcite 应用进一步加强数据管理平台核心的一个好的案例研究。
**Linux.com：你有哪些期待的新功能？
Atri：流 SQL 增强是令我非常兴奋的事情。这些功能令人兴奋，因为它们将使 Calcite 的用户能够更快地开发实时流式应用程序，并且这些程序的强大和功能将是多方面的。流程序是新的事实，并且在流 SQL 中具有查询优化的优点对于大部分人将是非常有用的。此外，关于暂存表的讨论还在进行，所以请继续关注！
--------------------------------------------------------------------------------
via: https://www.linux.com/news/build-strong-real-time-streaming-apps-apache-calcite
作者：[AMBER ANKERHOLZ][a]
译者：[geekpi](https://github.com/geekpi)
校对：[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 组织编译，[Linux中国](https://linux.cn/) 荣誉推出
[a]:https://www.linux.com/users/aankerholz
[1]:https://www.linux.com/licenses/category/used-permission
[2]:https://www.linux.com/licenses/category/creative-commons-zero
[3]:https://www.linux.com/files/images/atri-sharmajpg
[4]:https://www.linux.com/files/images/calcitejpg
[5]:https://calcite.apache.org/
[6]:http://events.linuxfoundation.org/events/apache-big-data-europe
[7]:https://calcite.apache.org/