Hello Martin,
Thanks for reaching out. For example if your query is related with metrics then you can use "SummaryRowSetting" setting to the "SUMMARY_ROW_ONLY" (It will return summary row only and return no results) under your query any metric fields report e.g. conversion_action report. There are many types of SummaryRowSetting’s you can use, please refer to this link.
As shown here - "summary_row_setting": "SUMMARY_ROW_ONLY" (please note you can not return summary row if your API request did not select any metrics field). Hope this helps, please let me know if you have any questions.
Best regards,
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| Jakeia Sabrina |
| Google Ads API Team |
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