kasiazjc commented on PR #37298:
URL: https://github.com/apache/superset/pull/37298#issuecomment-3877503337

   Ok, so I did a bunch of digging in terms of UX best practises and patterns 
in other BI apps to figure out error patterns that we could use and I am going 
back to my previous idea of combined error (validation on field + banner in 
this specific case). 
   
   A little backstory and context (and maybe a start on design guidelines) - in 
terms of an error types I think these three types make sense for us in general: 
   
   ## Validation Error Only
   _When:_ Standard form validation, doesn't block entire workflow.
   SQL Lab examples:
   
   - Required field empty
   - Invalid input format
   - Character limit exceeded
   
   Why field-only: Error and fix are in the same place.
   
   ## Alert Banner Only
   _When:_ Not tied to a specific field, or system-level issue.
   SQL Lab examples:
   
   - Session expired
   - Network issues
   - Workspace permission denied
   - Query timeout
   - Result set too large
   
   Why banner-only: No field caused it, no field can fix it.
   
   ## Validation Error + Alert Banner
   _When:_ Field-specific issue blocks the workflow, user can resolve it.
   _Components:_ Validation error state on field + persistent banner above SQL 
editor with action link
   SQL Lab examples:
   
   - Database requires OAuth (our case)
   - Invalid/deleted schema selected
   - Catalog needs configuration
   
   Why both: Field shows what's wrong in context (which specific selection 
broke the flow), banner shows impact and how to fix. Persists when modal closes.
   
   ---
   
   @michael-s-molina I know you are not a fan of combining both, but this is 
also a pattern that other BI tools use (like Looker or PowerBI) - so showing 
the error both at the source (the field) and at the impact point (where work is 
blocked). 
   
   For our database auth case, the key issue is the flow: user picks a 
database, sees the auth error in the modal, but might close it without 
authorizing. If the error only lives in that modal, it disappears. Then they 
try to run a query and get a confusing failure. With a banner above the SQL 
editor + field indicator, the error stays visible and they don't have to 
remember what went wrong or where to fix it.
   
   Visually it would look like this (also this would be a placement for the 
global banner in general) 
   
   <img width="1748" height="1098" alt="image" 
src="https://github.com/user-attachments/assets/cd6d7ee6-dbbd-4587-88b7-36742a4b6c93";
 />
   
   
   This is also aligned with UX principles like: 
   - Proximity principle - Errors appear where users can act on them (field 
validation), while also providing workflow context (banner)
   - Context at the right time - Field validation when modal is open, banner 
when user returns to their work area. Handles both interface states cleanly
   there is also a clear recovery path (where to click - what went wrong), 
users don't have to remember what exactly went wrong (so this reduces cognitive 
load). 
   
   Wdyt? 


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