Is your feature request related to a problem? Please describe.
Some databases do not bring a metaschema on their own, and their metadata statements are very limited. Hence, one cannot look for an object in an arbitrary set of locations in a single step.

Describe the solution you'd like
I want some sort of search dialog that allows me to filter schemas, tables and columns across all databases/schemas/tables. Optional support from drivers would be nice for optimization purposes, otherwise it should just iteratively search along the whole object tree.

Describe alternatives you've considered
Use custom scripts, probably in Python.