Function polars_io::csv::utils::infer_file_schema_inner

pub fn infer_file_schema_inner(
    reader_bytes: &ReaderBytes<'_>,
    separator: u8,
    max_read_rows: Option<usize>,
    has_header: bool,
    schema_overwrite: Option<&Schema>,
    skip_rows: &mut usize,
    skip_rows_after_header: usize,
    comment_prefix: Option<&CommentPrefix>,
    quote_char: Option<u8>,
    eol_char: u8,
    null_values: Option<&NullValues>,
    try_parse_dates: bool,
    recursion_count: u8,
    raise_if_empty: bool
) -> PolarsResult<(Schema, usize, usize)>

Available on crate features csv or json only.