March 2021
Intermediate to advanced
265 pages
6h 50m
Chinese
Content preview from Presto实战
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64
｜
第
4
章
此外，如果你想要查看一个数据子集的统计信息，就可以给出过滤条件，例如；
SHOW STATS FOR (SELECT * FROM hive.ontime.flights WHERE year > 2010);
4.13
小结
你现在了解了
Presto
的架构，它使用一个协调器来接收用户请求，之后调用工作节点来组
装各种数据。
每个查询都被翻译成分布式查询计划，查询计划由任务组成的多个
Stage
构
成。数据以切
片形式由连接器返回，并在多个
Stage
中执行，直到最终结果可用并由协调器提供给用户。
如果你对
Presto
架构的更多细节感兴趣
，可以研读来自
Presto
创造者的论文“
Presto
—
SQL
on Everything
”，
由
ICDE
（
IEEE International Conferenceon Data Engineering
）发表。论文
也可以在官方网站上找到（参见
1.4.1
节
）。
第
5
章会讲解更多有关
Presto
集群部署的知识
；第
6
章和第
7
章会介绍使用不同连接器为
Presto
提供更多数据源的信息；第
8
章会阐释如何编写强大的查询。
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and much more.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.