spark catalyst中的DSL 解析

spark catalyst中的DSL 解析

来自源代码

import org.apache.spark.sql.catalyst.expressions.Literal

import org.apache.spark.sql.catalyst.dsl.expressions._


Literal(1) + Literal(1)

'a.attr

'b.attr.toString()

'a === 'b

import org.apache.spark.sql.catalyst.plans.logical._
import org.apache.spark.sql.catalyst.dsl.plans._