文档详细介绍了ClickHouse实现MySQL wire协议的过程，包括身份验证机制的选择、SSL支持的添加、多客户端环境的测试以及与其他支持MySQL协议的数据库的比较。在实现过程中，发现并修复了MySQL客户端中的一个bug，并提出了相应的补丁。文档还讨论了在ClickHouse中不支持某些MySQL客户端字段的问题，并提供了相关实现细节和测试结果。

文档主要介绍了PlantUML 1.2021.3版本的功能和语法，包括部署图、实体关系图、数学公式显示、AWS库的使用以及YAML数据的展示。文档详细说明了如何通过PlantUML绘制各种图表，并提供了相关的语法示例和库的集成方法。

The document provides a comprehensive guide to PlantUML version 1.2019.6, detailing its features and functionalities. It covers various diagram types such as UML diagrams, sequence diagrams, class diagrams, and non-UML diagrams like mind maps and work breakdown structures. The guide also explains preprocessing capabilities similar to the C language preprocessor, variable definitions, conditions, and integration with external libraries like AsciiMath and JLaTeXMath for mathematical notations. Additionally, it includes examples of how to customize diagrams using skin parameters and how to include cloud icons for visual representation.

PlantUML是一个开源工具，用于快速创建多种类型的UML图表以及其他非UML图表，如ArchiMate、SDL、Ditaa、Gantt图等。它支持使用简单的、直观的语言来创建图表，并集成了Creole语言以标准化定义文本样式。文档还介绍了如何使用标准库以及如何访问OpenIconic图标列表。

The document provides a comprehensive guide to PlantUML version 1.2021.1, detailing its various features and capabilities. It covers the creation of UML diagrams, including sequence, class, object, and state diagrams, as well as non-UML diagrams such as network diagrams, Archimate diagrams, and entity-relationship (ER) diagrams. The guide also explains how to customize diagrams using skin parameters and includes examples of using external libraries like Cloud Insight and Tupadr3 for enhanced visualization.

Документ представляет собой руководство по языку PlantUML версии 1.2019.9, охватывающее создание различных типов диаграмм, включая UML-диаграммы (классы, последовательности, состояния и др.), а также не-UML-диаграммы (Gantt, MindMap, Work Breakdown Structure и другие). В руководстве представлены примеры использования синтаксиса,_skinparam для настройки вида, поддержка Unicode и другие функции.

The document provides a comprehensive guide to using PlantUML, a tool for creating UML diagrams and other types of charts. It covers various diagram types such as sequence diagrams, class diagrams, activity diagrams, and more. The document also includes examples of PlantUML syntax and demonstrates how to create diagrams using simple and intuitive language. Additionally, it highlights the integration of mathematical formulas and customizations like skin parameters for enhanced visualization.

文档系统介绍了PlantUML 1.2020.22版本的功能及其使用方法，包括支持的多种图表类型（如UML图、甘特图、时序图等）及其语法。文档还详细讲解了如何自定义图表样式、如何插入数学公式以及如何使用第三方图标库来增强图表的视觉效果。

PlantUML是一个开源项目，用于快速创建各种UML图表（如序列图、类图、活动图等）和其他类型的图表（如Ditaa、Gantt图等）。文档详细介绍了其支持的功能，包括使用AsciiMath和JLaTeXMath显示数学公式、通过Creole格式定义文本样式、滚动条的使用以及图例的配置。此外，还提供了如何使用这些功能的示例。

The document provides a comprehensive guide to using PlantUML version 1.2019.2. It covers various commands and features such as comments, footers, headers, zooming, Unicode support, Creole syntax for text styling, mathematical formulas using AsciiMath and JLaTeXMath, and message grouping in sequence diagrams. The guide also explains how to create different types of UML diagrams, including sequence, class, activity, component, state, object, deployment, and synchronization diagrams. Additionally, it supports non-UML diagrams like wireframes, Archimate, SDL, Ditaa, Gantt, and mathematical notations.