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Impression Discrepancy between Google Ads Connector and Platform

I've started using the native Google Ads connector for BigQuery and I am having issues getting impressions. None of impression data seems to match with platform and the differences vary between being 1% off to over 130% off. 

I've been comparing metric_impressions from the CampaignStats and AdGroupStats tables to Impressions from Google Ads platform.

Has anyone else had this issue? Am I supposed to use a different metric to get impressions or do something to metric_impressions so they match?

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Thanks for responding but I was actually able to find the solution to this issue.

The problem was actually that I was using the Stats tables (ie CampaignStats) rather than the BasicStats tables (ie CampaignBasicStats). Since the Stat tables include a "Click Type" field it can cause some of the basic metrics to be incorrect.

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