Given the trains and the shopping mall, I am suspecting an airport ... possibly Singapore, it has been a few years since I lived there, and things change quickly
It is the rain vortex at the Jewel complex, Changi Airport, Singapore.
It is claimed to be the world's tallest indoor waterfall.
Please see Jewel Changi Airport
Don't forget to try Google Image Search / Lens first. Result searching with your image:
First result: Changi airport Singapore.