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https://issues.apache.org/jira/browse/SPARK-22951?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16314508#comment-16314508
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Apache Spark commented on SPARK-22951:
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User 'liufengdb' has created a pull request for this issue:
https://github.com/apache/spark/pull/20174
> count() after dropDuplicates() on emptyDataFrame returns incorrect value
> ------------------------------------------------------------------------
>
> Key: SPARK-22951
> URL: https://issues.apache.org/jira/browse/SPARK-22951
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.6.2, 2.2.0, 2.3.0
> Reporter: Michael Dreibelbis
>
> here is a minimal Spark Application to reproduce:
> {code}
> import org.apache.spark.sql.SQLContext
> import org.apache.spark.{SparkConf, SparkContext}
> object DropDupesApp extends App {
>
> override def main(args: Array[String]): Unit = {
> val conf = new SparkConf()
> .setAppName("test")
> .setMaster("local")
> val sc = new SparkContext(conf)
> val sql = SQLContext.getOrCreate(sc)
> assert(sql.emptyDataFrame.count == 0) // expected
> assert(sql.emptyDataFrame.dropDuplicates.count == 1) // unexpected
> }
>
> }
> {code}
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