Barry Becker created SPARK-15230:
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Summary: Back quoted column with dot in it fails when running
distinct on dataframe
Key: SPARK-15230
URL: https://issues.apache.org/jira/browse/SPARK-15230
Project: Spark
Issue Type: Bug
Components: Examples
Affects Versions: 1.6.0
Reporter: Barry Becker
When working with a dataframe columns with .'s in them must be backquoted (``)
or the column name will not be found. This works for most dataframe methods,
but I discovered that it does not work for describe().
Suppose you have a dataFrame, testDf, with a DoubleType column named
"pos.NoZero". This statememt:
testDf.select(new Column("`pos.NoZero`")).distinct().collect().mkString(", ")
will fail with this error:
org.apache.spark.sql.AnalysisException: Cannot resolve column name "pos.NoZero"
among (pos.NoZero);
at
org.apache.spark.sql.DataFrame$$anonfun$resolve$1.apply(DataFrame.scala:152)
at
org.apache.spark.sql.DataFrame$$anonfun$resolve$1.apply(DataFrame.scala:152)
at scala.Option.getOrElse(Option.scala:121)
at org.apache.spark.sql.DataFrame.resolve(DataFrame.scala:151)
at
org.apache.spark.sql.DataFrame$$anonfun$dropDuplicates$1$$anonfun$40.apply(DataFrame.scala:1329)
at
org.apache.spark.sql.DataFrame$$anonfun$dropDuplicates$1$$anonfun$40.apply(DataFrame.scala:1329)
at
scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:245)
at
scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:245)
at
scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33)
at scala.collection.mutable.WrappedArray.foreach(WrappedArray.scala:35)
at scala.collection.TraversableLike$class.map(TraversableLike.scala:245)
at scala.collection.AbstractTraversable.map(Traversable.scala:104)
at
org.apache.spark.sql.DataFrame$$anonfun$dropDuplicates$1.apply(DataFrame.scala:1329)
at
org.apache.spark.sql.DataFrame$$anonfun$dropDuplicates$1.apply(DataFrame.scala:1328)
at
org.apache.spark.sql.DataFrame.org$apache$spark$sql$DataFrame$$withPlan(DataFrame.scala:2165)
at org.apache.spark.sql.DataFrame.dropDuplicates(DataFrame.scala:1328)
at org.apache.spark.sql.DataFrame.dropDuplicates(DataFrame.scala:1348)
at org.apache.spark.sql.DataFrame.dropDuplicates(DataFrame.scala:1319)
at org.apache.spark.sql.DataFrame.distinct(DataFrame.scala:1612)
at
com.mineset.spark.vizagg.selection.SelectionExpressionSuite$$anonfun$40.apply$mcV$sp(SelectionExpressionSuite.scala:317)
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