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https://issues.apache.org/jira/browse/SPARK-11478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14987379#comment-14987379
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Yanbo Liang commented on SPARK-11478:
-------------------------------------
I will try to find some clues.
> ML StringIndexer return inconsistent schema
> -------------------------------------------
>
> Key: SPARK-11478
> URL: https://issues.apache.org/jira/browse/SPARK-11478
> Project: Spark
> Issue Type: Bug
> Components: ML
> Reporter: Yanbo Liang
>
> ML StringIndexer transform and transformSchema return inconsistent schema.
> {code}
> val data = sc.parallelize(Seq((0, "a"), (1, "b"), (2, "c"), (3, "a"), (4,
> "a"), (5, "c")), 2)
> val df = sqlContext.createDataFrame(data).toDF("id", "label")
> val indexer = new StringIndexer()
> .setInputCol("label")
> .setOutputCol("labelIndex")
> .fit(df)
> val transformed = indexer.transform(df)
> println(transformed.schema.toString())
> println(indexer.transformSchema(df.schema))
> The nullable of "labelIndex" return inconsistent value:
> StructType(StructField(id,IntegerType,false),
> StructField(label,StringType,true), StructField(labelIndex,DoubleType,true))
> StructType(StructField(id,IntegerType,false),
> StructField(label,StringType,true), StructField(labelIndex,DoubleType,false))
> {code}
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