Index used to indicate the order of precedence one column has over another when sorting the rows. Sorting occurs first using the column with a sort_index of 1, then on the column with a sort_index of 2 and so on. A value of 0 means "do not sort on this column".
order of precedence one
column has over another
when sorting the rows.
Sorting occurs first using
the column with a sort_index
of 1, then on the column
with a sort_index of 2 and
so on. A value of 0 means
"do not sort on this column".