GitHub user hansva added a comment to the discussion: Gui Freezes “Get fields” 
freezes Hop GUI on Linux (Ubuntu)

This will probably be caused by your table input transform, when pressing get 
fields we will refresh the field definitions.
In case of your table input, we will execute the query you have configured with 
a "LIMIT 1" to only fetch one row. But if this is a query that takes a while 
before that 1 row is returned you could end up in a frozen UI.

GitHub link: 
https://github.com/apache/hop/discussions/6232#discussioncomment-15295781

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