pub fn count_rows(
path: &Path,
separator: u8,
quote_char: Option<u8>,
comment_prefix: Option<&CommentPrefix>,
eol_char: u8,
has_header: bool,
) -> PolarsResult<usize>
Available on crate features
csv
or json
only.Expand description
Read the number of rows without parsing columns useful for count(*) queries