suppose i have a table t: ([]isMatched:
(1b,1b,0b,0b;1b,1b,0b,0b;0b,0b,1b,1b);
index:((0,1,2,3);(0,1,2,3);(0,1,2,3));id:
((`a,`b,`c,`d);(`a,`b,`c,`d);(`a,`b,`c,`d))) so each row will find use
the first element in idx which the corresponding element i...