Scala 错误：'=' 预期但 ';' 成立
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Scala error: '=' expected but ';' found
提问by Jiang Xiang
Not sure what caused this problem: error: '=' expected but ';' found.
不确定是什么导致了这个问题：错误：'='预期但';' 成立。
val vectors = filtered_data_by_key.map( x => {
var temp
x._2.copyToArray(temp) // Error occurs here
(x._1, temp)
})
回答by George Simms
var tempisn't a statement.
var temp不是声明。
If you're trying to declare temp without assigning anything to it, do
如果您尝试声明 temp 而不为其分配任何内容，请执行
var temp :Array[_] = _
But is temp supposed to be an array? then try var temp = Array(). tempneeds something assigned to it before being passed into copyToArray. Also as you're not destructively assigning to temp it doesn't need to be a var.
但是 temp 应该是一个数组吗？然后尝试var temp = Array()。temp在传入之前需要分配给它的东西copyToArray。此外，由于您没有破坏性地分配给 temp，因此它不需要是 var。
回答by pzecevic
If filtered_data_by_key is an RDD of (T, Iterable), or in other words, a result of groupByKey transformation, then this can be written simply like this:
如果filtered_data_by_key是(T, Iterable)的RDD，或者说是groupByKey转换的结果，那么可以简单写成这样：
val vectors = filtered_data_by_key.map( { case (x, iter) => (x, iter.toArray) })
