Hi,
First, nice to hear that this feature seems to be awaited!
I have thought about this functionality before and I think it should
be relatively easy to add this functionality. The
QgsVectorLayerFeatureIterator could simply compute the values of the
virtual fields according to their definition in QgsVectorLayer. It
should automatically work lazily - if the field is not requested, it
would not be evaluated.
nice to hear!
Then, it should be made possible to integrate the joined fields in qgis
expressions without adding them to the current attributes (as it is now).
One way to to it could be a function: joinField( joinName, joinedFieldName)
Hence, the user would be allowed to choose which joined fields he really
wants to be accessible in the layer.
Do we actually need such functionality? Wouldn't it be enough to hide
the attributes you don't want?
I thought it might allow to clean the code related to joined fields by
moving it to QgsExpression evaluation.
I don't know really well how it's implemented, but I just notice that
there has been many bugs on a long period.
If you think it should be kept separated, ok for me!
Cheers,
Denis
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