add a function to randomly mix tuples in a bat usefull when we need to use two or more bats with exactly the same tuples but in different positions
add a function to randomly mix tuples in a bat
usefull when we need to use two or more bats with exactly the same tuples
but in different positions

zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb