Struct Groups 

pub struct Groups<'r, R> { /* private fields */ }

Iterator over reduce groups. Created by JobReader::groups or JobReader::groups_by.

Implementations

impl<R: Read> Groups<'_, R>

pub fn next_group(&mut self) -> Result<Option<Group<'_, R>>>

Advances to the next group.

Rows left unread in the current group are skipped, so a caller that only needs the first row of each group does not have to drain the rest.

Errors

Returns JobError if the stream cannot be read or does not parse.

Trait Implementations

impl<'r, R: Debug> Debug for Groups<'r, R>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.