CTCols cols = worksheet.getColsArray(0);
// Find the end of the group.
CTCol columnInfo = cols.getColArray(colInfoIndex);
int level = columnInfo.getOutlineLevel();
int idx = colInfoIndex;
while (idx < cols.sizeOfColArray() - 1) {
CTCol nextColumnInfo = cols.getColArray(idx + 1);
if (!isAdjacentBefore(columnInfo, nextColumnInfo)) {
break;
}
if (nextColumnInfo.getOutlineLevel() < level) {