这是一个创建于 3493 天前的主题，其中的信息可能已经有所发展或是发生改变。
git 地址 https://github.com/jadetang/scala_sql
作用就是写一个简单的sql，然后在一个List<Map>上做运算，思路来源是现在公司实时计算所用的执行引擎，不过他们是用java写的
suppose there is a List called user,which contains these data:
[name:tsc,age:30,sex:male]
[name:syy,age:29,sex:female]
[name:dudu,age:1,sex:male]
[name:xiaohua,age:2,sex:null]
[name:tsc,age:19,sex:male]
[name:tsc,age:99,sex:female]
[name:tsc,age:30,sex:female]
then
Engine.query(user,"select count(user) as number,name from user group by name")
will result in：
[number:1,name:dudu]
[number:4,name:tsc]
[number:1,name:xiaohua]
[number:1,name:syy]
作用就是写一个简单的sql，然后在一个List<Map>上做运算，思路来源是现在公司实时计算所用的执行引擎，不过他们是用java写的
suppose there is a List called user,which contains these data:
[name:tsc,age:30,sex:male]
[name:syy,age:29,sex:female]
[name:dudu,age:1,sex:male]
[name:xiaohua,age:2,sex:null]
[name:tsc,age:19,sex:male]
[name:tsc,age:99,sex:female]
[name:tsc,age:30,sex:female]
then
Engine.query(user,"select count(user) as number,name from user group by name")
will result in：
[number:1,name:dudu]
[number:4,name:tsc]
[number:1,name:xiaohua]
[number:1,name:syy]
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1
feilaoda 2015-05-20 22:39:07 +08:00
你公司用的Esper?
你这个有没有测试过在数据量很大时，超过1亿条，速度如何？ |
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2
ledkk 2015-05-21 08:49:55 +08:00
先下下来瞅瞅
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