Github user Leemoonsoo commented on the pull request:
https://github.com/apache/incubator-zeppelin/pull/695#issuecomment-180208608
I have tested following code
```
%spark
case class Test(n:Int, s:String)
val data = sc.parallelize(1 to 10000).map(i=>Test(i,
"aaaaaaaaaaaabbbbbbbbbbbbcccccccccccddddddddd")).toDF
data.registerTempTable("test")
```
and
```
%sql
select * from test
```
took 20 sec before this patch but only 1 sec after this patch in my machine.
significant performance improvement.
It looks good to me.
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