Rows in parts 1000000 Count 1000000 First row 0 10 Delete 100K rows using lightweight DELETE Rows in parts 1000000 Count 900000 First row 100000 10 Force merge to cleanup deleted rows Rows in parts 900000 Count 900000 First row 100000 10 Delete 100K more rows using lightweight DELETE Rows in parts 900000 Count 800000 First row 200000 10 Do UPDATE mutation Rows in parts 900000 Count 800000 First row 200000 1 Force merge to cleanup deleted rows Rows in parts 800000 Count 800000 First row 200000 1 Delete 100K more rows using lightweight DELETE Rows in parts 800000 Count 700000 First row 300000 1 Do ALTER DELETE mutation that does a "heavyweight" delete Rows in parts 533333 Count 466666 First row 300001 10 Delete 100K more rows using lightweight DELETE Force merge to cleanup deleted rows Rows in parts 400000 Count 400000 First row 400000 1