Github user wido commented on the pull request:
https://github.com/apache/cloudstack/pull/1341#issuecomment-171703995
Like @kevindierkx indeed says. A VARCHAR can be up to 64k characters long.
It seems that 2k is the maximum length of a URL used in most systems.
That's why we sticked with the VARCHAR and didn't go for text. A VARCHAR is
also a bit more optimal inside MySQL than a TEXT field.
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