[SPARK-15734][SQL] Avoids printing internal row in explain output

## What changes were proposed in this pull request?

This PR avoids printing internal rows in explain output for some operators.

**Before change:**

```
scala> (1 to 10).toSeq.map(_ => (1,2,3)).toDF().createTempView("df3")
scala> spark.sql("select * from df3 where 1=2").explain(true)
...
== Analyzed Logical Plan ==
_1: int, _2: int, _3: int
Project [_1#37,_2#38,_3#39]
+- Filter (1 = 2)
   +- SubqueryAlias df3
      +- LocalRelation [_1#37,_2#38,_3#39], [[0,1,2,3],[0,1,2,3],[0,1,2,3],[0,1,2,3],[0,1,2,3],[0,1,2,3],[0,1,2,3],[0,1,2,3],[0,1,2,3],[0,1,2,3]]
...
== Physical Plan ==
LocalTableScan [_1#37,_2#38,_3#39]
```

**After change:**

```
scala> spark.sql("select * from df3 where 1=2").explain(true)
...
== Analyzed Logical Plan ==
_1: int, _2: int, _3: int
Project [_1#58,_2#59,_3#60]
+- Filter (1 = 2)
   +- SubqueryAlias df3
      +- LocalRelation [_1#58,_2#59,_3#60]
...
== Physical Plan ==
LocalTableScan <empty>, [_1#58,_2#59,_3#60]
```

## How was this patch tested?
Manual test.

Author: Sean Zhong <seanzhong@databricks.com>

Closes #13471 from clockfly/verbose_breakdown_5.