我必须了解数据帧对象上名为 queryExecution 的变量,并在 console 中找到以下输出。但不确定它有什么帮助。请在控制台中找到输出。
scala> df.queryExecution
res5: org.apache.spark.sql.SQLContext#QueryExecution =
== Parsed Logical Plan ==
Project [_1#0 AS ID#2,_2#1 AS Token4#3]
LocalRelation [_1#0,_2#1], [[1,a],[2,b]]
== Analyzed Logical Plan ==
ID: int, Token4: string
Project [_1#0 AS ID#2,_2#1 AS Token4#3]
LocalRelation [_1#0,_2#1], [[1,a],[2,b]]
== Optimized Logical Plan ==
LocalRelation [ID#2,Token4#3], [[1,a],[2,b]]
== Physical Plan ==
LocalTableScan [ID#2,Token4#3], [[1,a],[2,b]]
Code Generation: true
Thanks