Allow relative hashes in table references

[adutra]

Fixes #7556.

[dimas-b]

This fix LGTM 👍 Should we also fix Spark SQL docs to use table#hash instead of table@hash (maybe in a separate PR)?

[adutra]

This fix LGTM 👍 Should we also fix Spark SQL docs to use table#hash instead of table@hash (maybe in a separate PR)?

I was under the impression that @pratyakshsharma would tackle that in #7559 :-)

But if not, I can open another PR for the docs part.

[pratyakshsharma]

Let me handle that in my PR :)