1. You don’t need to invent own wheel: sql-tap already
                 has test:do_eqp_test() function.

Done.


                2. Why did you divide tests and put them to different test suits?
                    > test/sql/gh2966-indexed-by.test.lua
                    > test/sql-tap/gh-2996-indexed-by.test.lua
                    Put them both to one file to sql-tap/ .

Done.

Branch:  https://github.com/tarantool/tarantool/tree/bn/gh-2996-indexed-by