/// <summary>
/// Create a composite schema of both the partitioned columns and the underlying loader columns.
/// </summary>
/// <param name="ectx">The exception context.</param>
/// <param name="cols">The partitioned columns.</param>
/// <param name="subLoader">The sub loader.</param>
/// <returns>The resulting schema.</returns>
private Schema CreateSchema(IExceptionContext ectx, Column[] cols, IDataLoader subLoader)
{
Contracts.AssertValue(cols);
Contracts.AssertValue(subLoader);
var builder = new SchemaBuilder();
builder.AddColumns(cols.Select(c => new Schema.DetachedColumn(c.Name, PrimitiveType.FromKind(c.Type.Value), null)));
var colSchema = builder.GetSchema();
var subSchema = subLoader.Schema;
if (subSchema.Count == 0)
{
return(colSchema);
}
else
{
var schemas = new ISchema[]
{
subSchema,
colSchema
};
return(Schema.Create(new CompositeSchema(schemas)));
}
}
/// <summary>
/// Create a new schema from the given columns.
/// </summary>
/// <param name="ectx">The exception context.</param>
/// <param name="cols">The columns.</param>
/// <returns>The resulting schema.</returns>
private ML.Data.Schema CreateSchema(IExceptionContext ectx, Column[] cols)
{
Contracts.AssertValue(ectx);
Contracts.AssertValue(cols);
var builder = new SchemaBuilder();
builder.AddColumns(cols.Select(c => new ML.Data.Schema.DetachedColumn(c.Name, c.ColType, null)));
return builder.GetSchema();
}
public static Schema Create(IExceptionContext ectx, params KeyValuePair<string, ColumnType>[] columns)
{
Contracts.CheckValueOrNull(ectx);
ectx.CheckValue(columns, nameof(columns));
var builder = new SchemaBuilder();
builder.AddColumns(columns.Select(kvp => new Schema.DetachedColumn(kvp.Key, kvp.Value)));
return builder.GetSchema();
}