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

["Xiangrui Meng (JIRA)" <ji...@apache.org>]

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

Xiangrui Meng updated SPARK-3569:
---------------------------------
    Component/s: MLlib
                 ML

> Add metadata field to StructField
> ---------------------------------
>
>                 Key: SPARK-3569
>                 URL: https://issues.apache.org/jira/browse/SPARK-3569
>             Project: Spark
>          Issue Type: New Feature
>          Components: ML, MLlib, SQL
>            Reporter: Xiangrui Meng
>
> 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



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