#31699: Fields placed at the SELECT clause in an erroneous order
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               Reporter:  Thodoris Sotiropoulos  |          Owner:  nobody
                   Type:  Uncategorized          |         Status:  new
              Component:  Uncategorized          |        Version:  3.0
               Severity:  Normal                 |       Keywords:
           Triage Stage:  Unreviewed             |      Has patch:  0
    Needs documentation:  0                      |    Needs tests:  0
Patch needs improvement:  0                      |  Easy pickings:  0
                  UI/UX:  0                      |
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 I have a query of the form (simplified for opening issue)

 {{{#!python
 q1 = Model.objects.values('col_a', 'col_b')
 q2 = Model.objects.annotate(col_c=F('col_a')).values('col_c', 'col_b')
 q1.union(q2)
 }}}

 The generated SQL query is

 {{{#!sql
 SELECT "model"."col_a", "model"."col_b" FROM "model" UNION SELECT
 "model"."col_b", "model"."col_a" AS "col_c" FROM "model"
 }}}

 It seems to me that when inspecting the second sub-query, django does not
 place fields at the SELECT clause in the correct order, that is

 {{{#!sql
 SELECT "model"."col_b", "model"."col_a" AS "col_c"
 }}}

 instead of

 {{{#!sql
 SELECT  "model"."col_a" AS "col_c", "model"."col_b"
 }}}

-- 
Ticket URL: <https://code.djangoproject.com/ticket/31699>
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