Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/7774#issuecomment-127286960
Finished the visualization work. This is a screenshot
And the codes:
```
org.apache.commons.io.FileUtils.deleteDirectory(new
java.io.File("people.parquet"))
val df =
sqlContext.read.format("json").load("examples/src/main/resources/people.json")
df.select('name, 'age).write.format("parquet").save("people.parquet")
val p = sqlContext.read.parquet("people.parquet")
val p1 = p.where('age > 0).select('name)
val p2 =
sqlContext.read.format("json").load("examples/src/main/resources/people.json")
p1.join(p2.limit(5), "name").join(p2.limit(5), "name").collect()
```
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