Add tests for POSITION(bytea, bytea)
Previously there was no coverage for this function.
Author: Aleksander Alekseev <aleksander@timescale.com>
Reviewed-by: Peter Smith <smithpb2250@gmail.com>
Reviewed-by: Rustam ALLAKOV <rustamallakov@gmail.com>
Discussion: https://postgr.es/m/CAJ7c6TMT6XCooMVKnCd_tR2oBdGcnjefSeCDCv8jzKy9VkWA5w@mail.gmail.com