Polypheny-UI: Query Plans are empty

[hennlo]

Problem description

After executing a statement via Web UI and trying to analyze any of the query plans, they are empty.

When opening the DevTools (F12 on Chrome) the console returns a DOMException:

ERROR DOMException: Failed to execute 'setItem' on 'Storage': Setting the value of 'plan_1637583587703' exceeded the quota.
    at t.analyzePlan (http://localhost:8080/main-es2015.c706ca53cde6a3d62e1a.js:1:45204)
    at t.createPlan (http://localhost:8080/main-es2015.c706ca53cde6a3d62e1a.js:1:44828)
    at t.initPlan (http://localhost:8080/main-es2015.c706ca53cde6a3d62e1a.js:1:160927)
    at t.ngOnInit (http://localhost:8080/main-es2015.c706ca53cde6a3d62e1a.js:1:161475)
    at Mn (http://localhost:8080/vendor-es2015.0b1246adaab211239458.js:1:1983544)
    at On (http://localhost:8080/vendor-es2015.0b1246adaab211239458.js:1:1983385)
    at Cn (http://localhost:8080/vendor-es2015.0b1246adaab211239458.js:1:1983111)
    at kr (http://localhost:8080/vendor-es2015.0b1246adaab211239458.js:1:2002106)
    at http://localhost:8080/vendor-es2015.0b1246adaab211239458.js:1:2002399
    at kr (http://localhost:8080/vendor-es2015.0b1246adaab211239458.js:1:2002424)

Environment

• OS: Windows 10
• Browser: Google Chrome (Version: 96.0.4664.45 )

[hennlo]

This problem is actually unique to Google Chrome and is caused specifically by Chrome's limitation of Local Storage.
The UI stores executed Query Plans offline in each browsers local storage, to reuse be able to reference it even after some time.

Since Google Chrome currently has a 5MB limitation on the local storage it might happen that is runs out after a while.
This observation might even be accelerated if you have a lot of extensions activated which utilize the local storage as well.

Solution

• Simply navigate to your site
• Open the DevTools(F12)
• Switch to Application
• In the navigation on the left select under Storage --> Local Storage
  
• Now select your site and hit: Clear All

This will resolve the issue and you should be able to visualize the Query Plans again

Note: Other Browsers like, Firefox, Safari, Edge, etc. are not effected.