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.Expand description
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