Rails core - Nov 2014 - ActiveRecord#minimum generates different column names with group by

Hi,

With Rails 4.1.7 I want to build a generic query calculating the minimum of 
a 'position' field. The 'group by' of this query is dynamic.
There may be
one or not, like so:

grouping=[]
Item.group(grouping).having("minimum_position>1").minimum(:position).each
do |item, min_pos|
  ....
end

I found out that if there is a grouping 
Item.group(:parent).having("minimum_position>1").minimum(:position)
will
generate:

SELECT *MIN(`items`.`position`) AS minimum_position*, parent_type AS 
parent_type, parent_id AS parent_id, position AS position FROM `items`  
GROUP BY parent_type, parent_id, position HAVING minimum_position>1

And if there is no grouping: 
Item.having("minimum_position>1").minimum(:position) will generate:

SELECT *MIN(`items`.`position`) AS minimum_id* FROM `items` HAVING 
minimum_position>1

which leads to an exception error as there is no field
'minimum_position'


Why do these two queries do not generate the same column name for the 
Minimum(:field) function?

Would it not be more Rails like to generate the same column name? Would it 
be worth proposing it as an issue?


Thanks


Jan

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