Solution : https://service.sap.com/sap/support/notes/1126568 (SAP Service marketplace login required)
Key words :
automatic star join optimization feature, enable star join optimization, bi query execution overriding, activate maxdop server-wide, globally enable/disable parallelism, rsadmin parameter mss_maxdop_cube_<cube, enable intra query parallelism, star join optimization, affect execution times, mss_maxdop_cube_<cubename> parameter
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