https://support.microsoft.com/en-au/topic/kb4480634-improvement-isavailableinmdx-feature-can-disable-processing-for-specific-columns-in-treatas-function-dax-query-in-sql-server-2017-75b0fef9-78e9-dfff-a2b8-c1dee4343992
KB4480634 - Improvement: IsAvailableInMDX feature can disable processing for specific columns in...
Improvement: IsAvailableInMDX feature can disable processing for specific columns in TREATAS function DAX query in SQL Server 2017
improvementfeature