[jira] [Resolved] (SPARK-3569) Add metadata field to StructField

["Michael Armbrust (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-3569?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Armbrust resolved SPARK-3569.
-------------------------------------
       Resolution: Fixed
    Fix Version/s: 1.2.0

Issue resolved by pull request 2701
[https://github.com/apache/spark/pull/2701]

> Add metadata field to StructField
> ---------------------------------
>
>                 Key: SPARK-3569
>                 URL: https://issues.apache.org/jira/browse/SPARK-3569
>             Project: Spark
>          Issue Type: New Feature
>          Components: MLlib, SQL
>            Reporter: Xiangrui Meng
>            Assignee: Xiangrui Meng
>             Fix For: 1.2.0
>
>
> Want to add a metadata field to StructField that can be used by other applications like ML to embed more information about the column.
> {code}
> case class case class StructField(name: String, dataType: DataType, nullable: Boolean, metadata: Map[String, Any] = Map.empty)
> {code}
> For ML, we can store feature information like categorical/continuous, number categories, category-to-index map, etc.
> One question is how to carry over the metadata in query execution. For example:
> {code}
> val features = schemaRDD.select('features)
> val featuresDesc = features.schema('features).metadata
> {code}



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