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Sometimes, a select statement contains multiple window functions whose window definitions (OVER clauses) may be the same or different. For the same windows, there is no need to partition and sort them again. We can merge them into a Window operator. such as The realization principle of window function in spark and hive Case in: select i ...

This article starts with WeChat official account of vivo Internet technology. Links: https://mp.weixin.qq.com/s/jG8rAjQ8QAOmViiQ33SuEg Author: Chen Long Recent projects need to support dozens of languages. Many small languages seem to be the same as garbled code in the eyes of people who don't know them. Translation is generally transl ...

1. High availability cluster construction scheme Node A: synchronize messages with node B, node C, so node a, node B, node C can be used as consumer access nodes Node B: as master node, as producer access node and consumer access node Node C: as slave node of slave, as producer access node and consumer access node. When the master node is ...

java delete all null values in list This article introduces how to delete all null values in the list, which are implemented in the normal Java way, Guava, Apache Commons Collections and java8 lambda expression way. Normal java mode The java Collection framework provides a simple solution through the basic while loop: @ ...

1. Click on the topology map and no graphics information will appear. This error is caused by the lack of GD devel installation treasure; [root@server20 nagios-cn-3.2.3]# yum install /mnt/nagios/gd-devel-2.0.35-11.el6.x86_64.rpm -y 403 error occurred when using command to detect httpd service status, which is caus ...

order This paper mainly studies how to use opennlp to customize named entity, label training and model application. maven <dependency> <groupId>org.apache.opennlp</groupId> <artifactId>opennlp-tools</artifactId> <version>1.8.4</version> </dependency ...

There are many ways to integrate mybatis in spring, which can be fully xml configured or annotated. A simple configuration method is recorded here. Project directory: 1. Reference the maven configuration of the jar package. <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jd ...

Here is the basic construction: http://www.cnblogs.com/xuyiqing/p/8600888.html Next, we did simple addition, deletion, modification and query: http://www.cnblogs.com/xuyiqing/p/8601506.html   But we found that there were too many duplicate codes Next, integrate and implement DAO development:   1: Original DAO development: package dao; import ...

order This paper mainly studies grpcstream service status of skywalking GRPCStreamServiceStatus skywalking-6.6.0/apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/remote/GRPCStreamServiceStatus.java public class GRPCStreamServiceStatus { private static final ILog logger = LogManager.getLogger(GRPCStreamServiceSta ...

Introduction to ActiveMQ: https://my.oschina.net/u/4284277/blog/3212385 SpringBoot Integrates ActiveMQ: https://my.oschina.net/u/4284277/blog/3212387 MQ theoretical knowledge: https://my.oschina.net/u/4284277/blog/3212391 1. Installation Official website: http://activemq.apache.org/ Baidu Disk Address: Link: https://pan.baidu.com/s/1A55X- ...