I would like to know what is the MonetDB header datatype if no alias or column name provided? In my BI application, am getting an error while using SELECT SUM(DISTINCT COLUMN_NAME) FROM TABLE_NAME. I see it works in 11.27.9 build when installed in CentOS. However, when i download the source tarball and recompile the code, this fox seems to be lost. Is there anywhere this can be identified? Or fixed?