[BUG] PPL has issues working with backticks in spark catalog namspaces

[ps48]

What is the bug?

Doesn't Work:
PPL : source = `glue_1`.`default`.`http_logs` | head 10

Error: Fail to analyze query. Cause: spark_catalog requires a single-part namespace, but got [`glue_1`, `default`]

Works: 
PPL : source =  glue_1.default.http_logs | head 10

SQL: select * from `glue_1`.`default`.`http_logs` limit 10

SQL: select * from glue_1.default.http_logs` limit 10

What is the expected behavior?
The PPL and SQL behaviour should be consistent with the tags

Do you have any screenshots?

oblem.

[noCharger]

@ps48 this should have being fixed by #224, could you verify?

[ps48]

@noCharger I'm not sure if that PR fixes this issue. This is particular to PPL implementation.

[dai-chen]

This looks like in PPL implementation in Flint extension. @YANG-DB Could you have a quick look?