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https://issues.apache.org/jira/browse/SPARK-23448?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16375386#comment-16375386
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Apache Spark commented on SPARK-23448:
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User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/20666
> Dataframe returns wrong result when column don't respect datatype
> -----------------------------------------------------------------
>
> Key: SPARK-23448
> URL: https://issues.apache.org/jira/browse/SPARK-23448
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.0.2
> Environment: Local
> Reporter: Ahmed ZAROUI
> Priority: Major
>
> I have the following json file that contains some noisy data(String instead
> of Array):
>
> {code:java}
> {"attr1":"val1","attr2":"[\"val2\"]"}
> {"attr1":"val1","attr2":["val2"]}
> {code}
> And i need to specify schema programatically like this:
>
> {code:java}
> implicit val spark = SparkSession
> .builder()
> .master("local[*]")
> .config("spark.ui.enabled", false)
> .config("spark.sql.caseSensitive", "True")
> .getOrCreate()
> import spark.implicits._
> val schema = StructType(
> Seq(StructField("attr1", StringType, true),
> StructField("attr2", ArrayType(StringType, true), true)))
> spark.read.schema(schema).json(input).collect().foreach(println)
> {code}
> The result given by this code is:
> {code:java}
> [null,null]
> [val1,WrappedArray(val2)]
> {code}
> Instead of putting null in corrupted column, all columns of the first message
> are null
>
>
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