Is there any good reason why the pgrouting extension is still not supported by GCP Cloud SQL? I mean, Cloud SQL even supports PostGIS 2.3 version.
Also, considering I already have PostGIS 2.3 installed on Cloud SQL, is there any way I could install pgrouting manually without issuing the CREATE EXTENSION statement?
Thanks in advance.
As far as I'm aware, there's no way you can install pgRouting manually without using the CREATE EXTENSION statement, and as you already know, it's currently not supported unfortunately.
However, I was able to find a public feature request open here for pgRouting to be supported by PostgreSQL (in CloudSQL). You could comment and follow updates there on the potential support for it in future.