Fix a failed AR test when running with OracleAdapter

[koic]

Summary

This PR fixes the following failure when using Oracle (11g) .

% ruby -v
ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-linux]

% ARCONN=oracle bundle exec ruby -w -Itest test/cases/scoping/default_scoping_test.rb -n test_with_abstract_class_scope_should_be_executed_in_correct_context

(snip)

Run options: -n test_with_abstract_class_scope_should_be_executed_in_correct_context --seed 45783

# Running:

F

Finished in 0.331497s, 3.0166 runs/s, 6.0332 assertions/s.

  1) Failure:
DefaultScopingTest#test_with_abstract_class_scope_should_be_executed_in_correct_context [test/cases/scoping/default_scoping_test.rb:471]:
Expected /"lions"."is_vegetarian"/ to match "SELECT \"LIONS\".* FROM \"LIONS\" WHERE \"LIONS\".\"IS_VEGETARIAN\" = 0".

1 runs, 2 assertions, 1 failures, 0 errors, 0 skips

It matched the SQL string returned by OracleAdapter.

[rails-bot]

r? @eileencodes

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[eileencodes]

Does this need to be backported?

[koic]

@eileencodes Thanks for your reply. I confirmed that there is the same problem even in 5-1-stable branch.
Would you please backport this commit? Or I will open a PR of the backport.

[eileencodes]

Backported to 5-1-stable in f8dfd4a. Thanks @koic!

[koic]

I confirmed this test passed also in 5-1-stable. Thanks!