docs: Constraint getFKConstraintForColumns(Table tableMain, int[] mainCols,
                                           int[] refCols) {
  
          for (int i = 0, size = constraintList.length; i < size; i++) {
              Constraint c = constraintList[i];
  
              if (c.isEquivalent(tableMain, mainCols, this, refCols)) {
                  return c;
              }
          }
  
          return null;
      }