I'm reading up on the Content Query web part and based on this page, I can't understand the difference between the CommonViewFields property vs the ViewFieldsOverride property. How are they different?
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OK, was looking into this and i 'think' i got it!
Using neither you will get only the base fields available in the link you posted.
Using only CommonViewFields you will get the base fields AND the fields added by the CommonViewFields property.
Finally, Using ViewFieldsOverride, it will NOT pull the base fields, and ONLY pull the fields you specify with the ViewFieldsOverride.
So if you want to be as efficient as possible and only pull what you need, use ViewFieldsOverride. If you have single CQWP on a page with a small amount of information, you could just use the CommonViewFields to pull what you need.
If someone could confirm what i said, i would appreciate it.