diesel 2.3.8

A safe, extensible ORM and Query Builder for PostgreSQL, SQLite, and MySQL
Documentation 
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simple_clause!(NoGroupByClause, GroupByClause, " GROUP BY ");

pub trait ValidGroupByClause {
    type Expressions;
}

impl ValidGroupByClause for NoGroupByClause {
    type Expressions = ();
}

impl<GB> ValidGroupByClause for GroupByClause<GB> {
    type Expressions = GB;
}