apache SQL概览的相关内容

阿里云文档 2022-09-07

Dataphin即席sql报错Couldnotinitializeclassorg.apache.hadoop.hive.common.type.HiveDate

问题描述Dataphin 即席sql报错Could not initialize class org.apache.hadoop.hive.common.type.HiveDate。问题原因插入数据后，查询表报错，表结构有date字段，输入类型有问题。解决方案把表字段改成string类型，然后重新插...

文章 2022-02-17 来自：开发者社区

Apache Spark 3.0中的SQL性能改进概览

今天主要跟大家分享一下spark 3.0在SQL方向上的一些优化工作。从spark 2.4开始，大概有超过一年半的时间。对于一个比较活跃的开源项目来说，这个时间是非常长的。所以里面包含了大量的这种功能增强，性能优化，等各方面的新的feature在里面。大概超过50%的相关的issue都是和SQL相关的。在SQL这个方向上主要做的工作，大概分成四个方面。第一方面是工具类的。就是说基于spark的一....

文章 2022-02-17 来自：开发者社区

Apache Flink SQL概览

本篇核心目标是让大家概要了解一个完整的Apache Flink SQL Job的组成部分，以及Apache Flink SQL所提供的核心算子的语义，最后会应用Tumble Window编写一个End-to-End的页面访问的统计示例。 Apache Flink SQL Job的组成我们做任何数据计算都离不开读取原始数据，计算逻辑和写入计算结果数据三部分，当然基于Apache Flink SQ....

文章 2022-02-17 来自：开发者社区

Apache Flink 漫谈系列(08) - SQL概览

SQL简述 SQL是Structured Query Language的缩写，最初是由美国计算机科学家Donald D. Chamberlin和Raymond F. Boyce在20世纪70年代早期从 Early History of SQL 中了解关系模型后在IBM开发的。该版本最初称为[SEQUEL: A Structured English Query Language]（结构化英语查询语....

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