HasSchema

Matches the type parameter of the annotated class to DataRow/DataFrame type parameter T.

Annotate public API classes that implement DataRow/DataFrame interface to enable "extract schema/create column from values" operation:

df.add {
  "col" from { it }
}

Result before: col: DataColumn<AddDataRow<MySchema>>

Result after:

col:
  col1: Int
  col2: String