bobtins commented on issue #1877:
URL: 
https://github.com/apache/arrow-datafusion/issues/1877#issuecomment-1065776134


   Hi, noticed this issue and just wanted to put my two cents in.
   <soapbox>
   The tl;dr is that most of the time you don't need these added levels; at 
most maybe add schema. 
   I've worked with a data analysis tool that was cross-database in nature, and 
I noticed that catalogs and schemas mean different things for each DB impl, and 
most of the time I never had to deal with "catalog". If for PostgreSQL it's the 
same as "database", I'm not sure why you need "create catalog" if you have 
"create database".
   The sample output you are showing looks like it's from "information_schema" 
which is just a generic metadata standard that tries to be one size fits all; 
as such, it has things that are only used in some DBs. That said, it's kind of 
counterintuitive that a "." in a table name is a legal character, as you 
demonstrate.
   Personally, I can get by without either schema or catalog, but YMMV...
   </soapbox>


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