Arel::Expressions

    # File lib/arel/expressions.rb, line 19
19:     def average
20:       Nodes::Avg.new [self], Nodes::SqlLiteral.new('avg_id')
21:     end

   # File lib/arel/expressions.rb, line 3
3:     def count distinct = false
4:       Nodes::Count.new [self], distinct
5:     end

    # File lib/arel/expressions.rb, line 11
11:     def maximum
12:       Nodes::Max.new [self], Nodes::SqlLiteral.new('max_id')
13:     end

    # File lib/arel/expressions.rb, line 15
15:     def minimum
16:       Nodes::Min.new [self], Nodes::SqlLiteral.new('min_id')
17:     end

   # File lib/arel/expressions.rb, line 7
7:     def sum
8:       Nodes::Sum.new [self], Nodes::SqlLiteral.new('sum_id')
9:     end