使用语言集成SQL与schemaRDD SQL函数 [英] SQL-Functions with schemaRDD using language integrated SQL

问题描述

我想使用基于SQL语言的功能集成SQL来筛选schemaRDD。例如，我想运行

I want to filter a schemaRDD using language integrated SQL based on SQL functions. For example I want to run

SELECT name FROM people WHERE name LIKE '%AHSAN%' AND name regexp '^[A-Z]{20}$'

如何在people.where使用这些SQL函数（）？

参考：

有关语言集成的SQL，我下面给出的示例<一个href=\"http://spark.apache.org/docs/latest/sql-programming-guide.html#writing-language-integrated-relational-queries\"相对=nofollow>这里。

For language integrated SQL, I am following the example given here.

val sqlContext = new org.apache.spark.sql.SQLContext(sc)
import sqlContext._
val people: RDD[Person] = ... // An RDD of case class objects, from the first example.
// The following is the same as 'SELECT name FROM people WHERE age >= 10 AND age <= 19'
val teenagers = people.where('age >= 10).where('age <= 19).select('name)
teenagers.map(t => "Name: " + t(0)).collect().foreach(println)

在此先感谢！

推荐答案

您可以用这样的数字运算符的SQL函数。如，

You can use SQL functions like numeric operators. E.g.,

people.where('name like "%AHSAN%").where('name rlike "^[A-Z]{20}$").select('name)

有在星火SQL没有正则表达式，但它一样 RLIKE 。

There is no regexp in Spark SQL but it's same as rlike.

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