Function polars_io::csv::read::schema_inference::infer_file_schema

pub fn infer_file_schema(
    reader_bytes: &ReaderBytes<'_>,
    separator: u8,
    max_read_rows: Option<usize>,
    has_header: bool,
    schema_overwrite: Option<&Schema>,
    skip_rows: 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,
    raise_if_empty: bool,
    n_threads: &mut Option<usize>,
    decimal_comma: bool
) -> PolarsResult<(Schema, usize, usize)>

Available on crate features csv or json only.

Infer the schema of a CSV file by reading through the first n rows of the file, with max_read_rows controlling the maximum number of rows to read.

If max_read_rows is not set, the whole file is read to infer its schema.

Returns - inferred schema - number of rows used for inference. - bytes read