Every now and then when I am working on making the SQL Server adapter pass all
the ActiveRecord tests, I notice one that looks like a false positive in the
core DBs. Here is one case in relations_test.rb. Can someone look at this and
just tell me it is normal for other DBs and just odd for SQL Server? Or maybe
it is just my understand of some SQL standard. I'm really not that SQL smart.
Honestly.
def test_count_explicit_columns
Post.update_all(:comments_count => nil)
posts = Post.scoped
...
assert_equal 0, posts.where('id is not null').select('comments_count').count
...
end
OK, this passes in standard DBs, postgresql, sqlite3, and mysql. But why? There
are 11 rows, all where comments_count is null. Do other DBs at this point make
a count some sort of aggregate sum?
- Ken
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