Function rows_to_schema_supertypes 

pub fn rows_to_schema_supertypes(
    rows: &[Row<'_>],
    infer_schema_length: Option<usize>,
) -> PolarsResult<Schema>

Available on crate features rows or object only.

Infer the schema of rows by determining the supertype of the values.

Field names are set as column_0, column_1, and so on.