In hit streaming tables, the traffic.source and traffic.medium fields contain values taken directly from the UTM tags in the pagePath (&dr and &dl parameters) for a given hit.
In the session streaming tables, the data in the trafficSource.source and trafficSource.medium fields is based on the session data in Google Analytics.
Since the Last Non-Direct Click attribution model is applied by default in Google Analytics reports, direct traffic is ignored, and 100% of the conversion value is attributed to the last non-direct channel that a customer clicked through from before buying or converting. All Direct visits are ignored within 6 months after the non-direct visit.
Thus, it would be incorrect to compare referral data in the session streaming to the data in the hit streaming.
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