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When setting a value within a visual to Count(DISTINCT), blank cells are counted which skews the total count of values within that column.
Although this can be accomplished using DAX DISTINCTCOUNTNOBLANK(), it not always practical to use the DAX measure as it prevents the export of underlying data within the visual.
Can the visual value summarization of Count(Distinct) be changed to reflect the DAX function of DISTINCTCOUNTNOBLANK()? Why would you want to count a blank/empty cell anyway?
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Currently Count(Distinct) is equal to DISTINCTCOUNT() function which is by design in Power BI Desktop as far as I know.
Blank value could also be counted in some senarios, if want to count non blank values, using DISTINCTCOUNTNOBLANK() function is a better choice.
In addition, about this feasure in the field, you can submit the requirement to ideas and add your comments there to make this feature coming sooner: https://ideas.powerbi.com/forums/265200-power-bi-ideas
It is a place for customers provide feedback about Microsoft Office products . What’s more, if a feedback is high voted there by other customers, it will be promising that Microsoft Product Team will take it into consideration when designing the next version in the future.
Best Regards,
Community Support Team _ Yingjie Li