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  1. Spark
  2. SPARK-6635

DataFrame.withColumn can create columns with identical names

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Details

    • Bug
    • Status: Resolved
    • Major
    • Resolution: Fixed
    • 1.3.0
    • 1.4.0
    • SQL
    • None

    Description

      DataFrame lets you create multiple columns with the same name, which causes problems when you try to refer to columns by name.

      Proposal: If a column is added to a DataFrame with a column of the same name, then the new column should replace the old column.

      scala> val df = sc.parallelize(Array(1,2,3)).toDF("x")
      df: org.apache.spark.sql.DataFrame = [x: int]
      
      scala> val df3 = df.withColumn("x", df("x") + 1)
      df3: org.apache.spark.sql.DataFrame = [x: int, x: int]
      
      scala> df3.collect()
      res1: Array[org.apache.spark.sql.Row] = Array([1,2], [2,3], [3,4])
      
      scala> df3("x")
      org.apache.spark.sql.AnalysisException: Reference 'x' is ambiguous, could be: x, x.;
      	at org.apache.spark.sql.catalyst.plans.logical.LogicalPlan.resolve(LogicalPlan.scala:216)
      	at org.apache.spark.sql.catalyst.plans.logical.LogicalPlan.resolve(LogicalPlan.scala:121)
      	at org.apache.spark.sql.DataFrame.resolve(DataFrame.scala:161)
      	at org.apache.spark.sql.DataFrame.col(DataFrame.scala:436)
      	at org.apache.spark.sql.DataFrame.apply(DataFrame.scala:426)
      	at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:26)
      	at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:31)
      	at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:33)
      	at $iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:35)
      	at $iwC$$iwC$$iwC$$iwC.<init>(<console>:37)
      	at $iwC$$iwC$$iwC.<init>(<console>:39)
      	at $iwC$$iwC.<init>(<console>:41)
      	at $iwC.<init>(<console>:43)
      	at <init>(<console>:45)
      	at .<init>(<console>:49)
      	at .<clinit>(<console>)
      	at .<init>(<console>:7)
      	at .<clinit>(<console>)
      	at $print(<console>)
      	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
      	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      	at java.lang.reflect.Method.invoke(Method.java:606)
      	at org.apache.spark.repl.SparkIMain$ReadEvalPrint.call(SparkIMain.scala:1065)
      	at org.apache.spark.repl.SparkIMain$Request.loadAndRun(SparkIMain.scala:1338)
      	at org.apache.spark.repl.SparkIMain.loadAndRunReq$1(SparkIMain.scala:840)
      	at org.apache.spark.repl.SparkIMain.interpret(SparkIMain.scala:871)
      	at org.apache.spark.repl.SparkIMain.interpret(SparkIMain.scala:819)
      	at org.apache.spark.repl.SparkILoop.reallyInterpret$1(SparkILoop.scala:856)
      	at org.apache.spark.repl.SparkILoop.interpretStartingWith(SparkILoop.scala:901)
      	at org.apache.spark.repl.SparkILoop.command(SparkILoop.scala:813)
      	at org.apache.spark.repl.SparkILoop.processLine$1(SparkILoop.scala:656)
      	at org.apache.spark.repl.SparkILoop.innerLoop$1(SparkILoop.scala:664)
      	at org.apache.spark.repl.SparkILoop.org$apache$spark$repl$SparkILoop$$loop(SparkILoop.scala:669)
      	at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply$mcZ$sp(SparkILoop.scala:996)
      	at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply(SparkILoop.scala:944)
      	at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply(SparkILoop.scala:944)
      	at scala.tools.nsc.util.ScalaClassLoader$.savingContextLoader(ScalaClassLoader.scala:135)
      	at org.apache.spark.repl.SparkILoop.org$apache$spark$repl$SparkILoop$$process(SparkILoop.scala:944)
      	at org.apache.spark.repl.SparkILoop.process(SparkILoop.scala:1058)
      	at org.apache.spark.repl.Main$.main(Main.scala:31)
      	at org.apache.spark.repl.Main.main(Main.scala)
      	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
      	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      	at java.lang.reflect.Method.invoke(Method.java:606)
      	at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:569)
      	at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:166)
      	at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:189)
      	at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:110)
      	at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
      

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              viirya L. C. Hsieh
              josephkb Joseph K. Bradley
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                Created:
                Updated:
                Resolved: