[jira] [Created] (SPARK-24756) Incorrect Statistics

["Nick Jordan (JIRA)" <ji...@apache.org>]

Nick Jordan created SPARK-24756:
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             Summary: 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


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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