Do not evaluate equality operator for numbers.

Expression type int is invalid for COLLATE clause
UniquenessValidationTest#test_validate_case_insensitive_uniqueness
UniquenessValidationTest#test_validate_uniqueness_on_existing_relation:
UniquenessValidationTest#test_validate_uniqueness_with_non_standard_table_names:
UniquenessValidationTest#test_validate_uniqueness_with_object_arg:
EnumTest#test_0031_validate uniqueness:

62 failures, 43 errors, 2 skips

Author: metaskills

lib/arel/visitors/sqlserver.rb

@@ -18,8 +18,11 @@ def visit_Arel_Nodes_BindParam o, collector
 
       def visit_Arel_Nodes_Bin o, collector
         visit o.expr, collector
-        collector << ActiveRecord::ConnectionAdapters::SQLServerAdapter.cs_equality_operator
-        collector << SPACE
+        if o.expr.val.is_a? Numeric
+          collector
+        else
+          collector << " #{ActiveRecord::ConnectionAdapters::SQLServerAdapter.cs_equality_operator} "
+        end
       end
 
       def visit_Arel_Nodes_Lock o, collector