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https://issues.apache.org/jira/browse/SPARK-24756?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Hyukjin Kwon resolved SPARK-24756.
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Resolution: Incomplete
> Incorrect Statistics
> --------------------
>
> Key: SPARK-24756
> URL: https://issues.apache.org/jira/browse/SPARK-24756
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Nick Jordan
> Priority: Major
> Labels: bulk-closed
>
> I'm getting some odd results when looking at the statistics for a simple data
> frame:
> {code:java}
> val df = spark.sparkContext.parallelize(Seq("y")).toDF("y")
> df.queryExecution.stringWithStats{code}
> {noformat}
> == Optimized Logical Plan
> == Project [value#7 AS y#9], Statistics(sizeInBytes=8.0 EB, hints=none)
> +- SerializeFromObject [staticinvoke(class
> org.apache.spark.unsafe.types.UTF8String, StringType, fromString, input[0,
> java.lang.String, true], true, false) AS value#7], Statistics(sizeInBytes=8.0
> EB, hints=none)
> +- ExternalRDD [obj#6], Statistics(sizeInBytes=8.0 EB, hints=none)
> {noformat}
> 8.0 Exabytes is clearly not right here. It is worth noting that if I don't
> parallelize the Seq then I get the expected results.
> This surfaced when I was running unit tests that verified that a broadcast
> hint was preserved which was failing because of the incorrect statistics.
>
>
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