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

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

Xiangrui Meng created SPARK-3569:
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             Summary: Add metadata field to StructField
                 Key: SPARK-3569
                 URL: https://issues.apache.org/jira/browse/SPARK-3569
             Project: Spark
          Issue Type: New Feature
          Components: 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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