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https://issues.apache.org/jira/browse/SPARK-18065?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Sean Owen resolved SPARK-18065.
-------------------------------
Resolution: Not A Problem
> Spark 2 allows filter/where on columns not in current schema
> ------------------------------------------------------------
>
> Key: SPARK-18065
> URL: https://issues.apache.org/jira/browse/SPARK-18065
> Project: Spark
> Issue Type: Bug
> Affects Versions: 2.0.0, 2.0.1
> Reporter: Matthew Scruggs
> Priority: Minor
>
> I noticed in Spark 2 (unlike 1.6) it's possible to use filter/where on a
> DataFrame that previously had a column, but no longer has it in its schema
> due to a select() operation.
> In Spark 1.6.2, in spark-shell, we see that an exception is thrown when
> attempting to filter/where using the selected-out column:
> {code:title=Spark 1.6.2}
> Welcome to
> ____ __
> / __/__ ___ _____/ /__
> _\ \/ _ \/ _ `/ __/ '_/
> /___/ .__/\_,_/_/ /_/\_\ version 1.6.2
> /_/
> Using Scala version 2.10.5 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_60)
> Type in expressions to have them evaluated.
> Type :help for more information.
> Spark context available as sc.
> SQL context available as sqlContext.
> scala> val df1 = sqlContext.createDataFrame(sc.parallelize(Seq((1, "one"),
> (2, "two")))).selectExpr("_1 as id", "_2 as word")
> df1: org.apache.spark.sql.DataFrame = [id: int, word: string]
> scala> df1.show()
> +---+----+
> | id|word|
> +---+----+
> | 1| one|
> | 2| two|
> +---+----+
> scala> val df2 = df1.select("id")
> df2: org.apache.spark.sql.DataFrame = [id: int]
> scala> df2.printSchema()
> root
> |-- id: integer (nullable = false)
> scala> df2.where("word = 'one'").show()
> org.apache.spark.sql.AnalysisException: cannot resolve 'word' given input
> columns: [id];
> {code}
> However in Spark 2.0.0 and 2.0.1, we see that the same filter/where succeeds
> (no AnalysisException) and seems to filter out data as if the column remains:
> {code:title=Spark 2.0.1}
> Welcome to
> ____ __
> / __/__ ___ _____/ /__
> _\ \/ _ \/ _ `/ __/ '_/
> /___/ .__/\_,_/_/ /_/\_\ version 2.0.1
> /_/
>
> Using Scala version 2.11.8 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_60)
> Type in expressions to have them evaluated.
> Type :help for more information.
> scala> val df1 = sc.parallelize(Seq((1, "one"), (2,
> "two"))).toDF().selectExpr("_1 as id", "_2 as word")
> df1: org.apache.spark.sql.DataFrame = [id: int, word: string]
> scala> df1.show()
> +---+----+
> | id|word|
> +---+----+
> | 1| one|
> | 2| two|
> +---+----+
> scala> val df2 = df1.select("id")
> df2: org.apache.spark.sql.DataFrame = [id: int]
> scala> df2.printSchema()
> root
> |-- id: integer (nullable = false)
> scala> df2.where("word = 'one'").show()
> +---+
> | id|
> +---+
> | 1|
> +---+
> {code}
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