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https://issues.apache.org/jira/browse/SPARK-11427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14984195#comment-14984195
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Ram Kandasamy commented on SPARK-11427:
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So it looks like this issue has been resolved in spark version 1.5.1, I will
mark this as duplicate as it was fixed in
https://issues.apache.org/jira/browse/SPARK-10539.
> DataFrame's intersect method does not work, returns 1
> -----------------------------------------------------
>
> Key: SPARK-11427
> URL: https://issues.apache.org/jira/browse/SPARK-11427
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.5.0
> Reporter: Ram Kandasamy
>
> Hello,
> I was working with dataframes and I found the intersect() method seems to
> always return '1'. The RDD's intersection() method does work properly.
> Consider this example:
> scala> val firstFile =
> sqlContext.read.parquet("/Users/ramkandasamy/sparkData/2015-07-25/*").select("id").distinct
> firstFile: org.apache.spark.sql.DataFrame = [id: string]
> scala> firstFile.count
> res4: Long = 1072046
> scala> firstFile.intersect(firstFile).count
> res5: Long = 1
> scala> firstFile.rdd.intersection(firstFile.rdd).count
> res6: Long = 1072046
> I have tried various different cases, and for some reason, the dataframe's
> intersect method always returns 1.
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