代码实现
// rdd转化为df[kv格式]
val df = sqlContext.createDataFrame(check_data_type, structType)
.select("cons_no", "org_no")
.distinct // 去重
.rdd
.map(row => (row.getAs[String]("cons_no"), row.getAs[String]("org_no")))
.collect()// 数据量较少
.toMap[String, String]
// 模式匹配
val value = df.get("") match{
case Some(a) => a // 提取出数据
case None => ""
}
println(value)