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I want to convert the type of some fields in a vector layer from String to Real. I am trying to use the Processing -> QGIS geoalgorithms -> Vector table tools -> Refactor fields tool to do this. When I open this up and select the layer I'm trying to edit, a dialog pops up that asks "Do you want to reset the field mapping?" (Yes/No) ... I can't find documentation anywhere on what this means.

Can someone explain?

enter image description here

(See lower center in image for dialog I'm referring to)

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    You might have done this Refactor fields operation before, and the Fields mapping as displayed may, potentially, be coming from your previous job. Or you might have loaded other mapping from the layer next to [Load fields] button. Either case, please do not worry about it. It is not a warning, just asking if you want to refresh the setting. – Kazuhito Mar 7 '18 at 4:45
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    Thanks @Joseph Let me borrow your comment which looks more appropriate to describe what it means. – Kazuhito Mar 7 '18 at 11:15
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You might have done this Refactor fields operation before, and the Fields mapping currently displayed may, potentially, be coming from your previous job. Or you might have loaded other mapping from the layer next to [Load fields] button. Either case, please do not worry about it.

The message window is not a warning, nor error. In this instance, reset is another name for reload (or refresh) ------- with thanks to @Joseph

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    I had never used the "Refactor fields" tool before, but I had added some fields via the Field Calculator, so maybe that was it. – J. Taylor Mar 8 '18 at 0:35
  • @J.Taylor I see. I have not seen that case. Thanks sharing! – Kazuhito Mar 8 '18 at 0:46

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