Preview:
Table = 
FILTER(
    UNION(
        SELECTCOLUMNS('Table1',"Name",[Name],"Date",[Date],"Column1",[Column1]),
        SELECTCOLUMNS('Table1',"Name",[Name],"Date",[Date],"Column1",[Column2]),
        SELECTCOLUMNS('Table1',"Name",[Name],"Date",[Date],"Column1",[Column3]),
        SELECTCOLUMNS('Table1',"Name",[Name],"Date",[Date],"Column1",[Column4]),
        SELECTCOLUMNS('Table1',"Name",[Name],"Date",[Date],"Column1",[Column5]),
        SELECTCOLUMNS('Table1',"Name",[Name],"Date",[Date],"Column1",[Column6])
    ),
    [Column1]<>"")
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