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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