Nyall Dawson 6605a2274f [processing] Optimise uniqueValues method
Now it uses the standard QgsVectorLayer.uniqueValues() method
where possible so that provider side optimisations are used

Also add test, and optimise request when using selected
features only
2016-10-12 17:05:15 +10:00
..
2016-10-05 12:38:51 +02:00
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