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  1. Spark
  2. SPARK-3569

Add metadata field to StructField

Details

    • New Feature
    • Status: Resolved
    • Major
    • Resolution: Fixed
    • None
    • 1.2.0
    • MLlib, SQL
    • None

    Description

      Want to add a metadata field to StructField that can be used by other applications like ML to embed more information about the column.

      case class case class StructField(name: String, dataType: DataType, nullable: Boolean, metadata: Map[String, Any] = Map.empty)
      

      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:

      val features = schemaRDD.select('features)
      val featuresDesc = features.schema('features).metadata
      

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              mengxr Xiangrui Meng
              mengxr Xiangrui Meng
              Michael Armbrust Michael Armbrust
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                Updated:
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