Thank you! This is a new function we introduced in 7.2 and 8.0. It should not impact or change behavior of any queries running in 7.0. If you are seeing any 7.0 query changes behavior after upgrading to 7.2/8.0, please let us know here or create a support tickets. Thank you!
In the meanwhile, if you are writing a query using this function in 7.2/8.0, it may stop working after downgrade to 7.0. This is expected.