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https://issues.apache.org/jira/browse/SPARK-17024?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Iaroslav Zeigerman closed SPARK-17024.
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Resolution: Cannot Reproduce
> Weird behaviour of the DataFrame when a column name contains dots.
> ------------------------------------------------------------------
>
> Key: SPARK-17024
> URL: https://issues.apache.org/jira/browse/SPARK-17024
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.0.0
> Reporter: Iaroslav Zeigerman
>
> When a column name contains dots and one of the segment in a name is the same
> as other column's name, Spark treats this column as a nested structure,
> although the actual type of column is String/Int/etc. Example:
> {code}
> val df = sqlContext.createDataFrame(Seq(
> ("user1", "task1"),
> ("user2", "task2")
> )).toDF("user", "user.task")
> {code}
> Two columns "user" and "user.task". Both of them are string, and the schema
> resolution seems to be correct:
> {noformat}
> root
> |-- user: string (nullable = true)
> |-- user.task: string (nullable = true)
> {noformat}
> But when I'm trying to query this DataFrame like i.e.:
> {code}
> df.select(df("user"), df("user.task"))
> {code}
> Spark throws an exception "Can't extract value from user#2;"
> It happens during the resolution of the LogicalPlan while processing the
> "user.task" column.
> Here is the full stacktrace:
> {noformat}
> Can't extract value from user#2;
> org.apache.spark.sql.AnalysisException: Can't extract value from user#2;
> at
> org.apache.spark.sql.catalyst.expressions.ExtractValue$.apply(complexTypeExtractors.scala:73)
> at
> org.apache.spark.sql.catalyst.plans.logical.LogicalPlan$$anonfun$4.apply(LogicalPlan.scala:276)
> at
> org.apache.spark.sql.catalyst.plans.logical.LogicalPlan$$anonfun$4.apply(LogicalPlan.scala:275)
> at
> scala.collection.LinearSeqOptimized$class.foldLeft(LinearSeqOptimized.scala:111)
> at scala.collection.immutable.List.foldLeft(List.scala:84)
> at
> org.apache.spark.sql.catalyst.plans.logical.LogicalPlan.resolve(LogicalPlan.scala:275)
> at
> org.apache.spark.sql.catalyst.plans.logical.LogicalPlan.resolveQuoted(LogicalPlan.scala:191)
> at org.apache.spark.sql.DataFrame.resolve(DataFrame.scala:151)
> at org.apache.spark.sql.DataFrame.col(DataFrame.scala:708)
> at org.apache.spark.sql.DataFrame.apply(DataFrame.scala:696)
> {noformat}
> Is this actually an expected behaviour?
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