March 2021
Intermediate to advanced
265 pages
6h 50m
Chinese
Content preview from Presto实战
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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.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.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.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.
高级连接器实例
｜
103
个范围放入分片中，由工作节点进行处理，这样就可以直接访问各个值，数据详细视图如
表
7-4
中所示。
表7-4：出发地、目的地及其他值的详细视图
Rowid Column Value
2232 flightdate:flightdate 2019-10-19
2232 flightnum:flightnum 118
2232 origin:origin JFK
2232 dest:dest SFO
1234 flightdate:flightdate 2019-11-02
1234 flightnum:flightnum 2237
1234 origin:origin BOS
1234 dest:dest DTW
5678 flightdate:flightdate 2019-11-02
5678 flightnum:flightnum 133
5678 origin:origin BOS
5678 dest:dest SFO
3498 flightdate:flightdate 2019-11-10
3498 flightnum:flightnum 133
3498 origin:origin BOS
3498 dest:dest SFO
为了利用谓词下推的优势，需要在想要下推谓词的列上建立索引。通过
Presto
连接器，可
以使用
index_columns
表属性在列上建立索引。
CREATE TABLE accumulo.ontime.flights (
rowid VARCHAR,
flightdate VARCHAR, ...
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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.