@Override
    public void afterRowDispose(RowWriteHandlerContext context) {
        if (context.getHead() || context.getRelativeRowIndex() == null) {
            return;
        }
        if (context.getRelativeRowIndex() % eachRow == 0) {
            CellRangeAddress cellRangeAddress = new CellRangeAddress(context.getRowIndex(),
                context.getRowIndex() + eachRow - 1,
                columnIndex, columnIndex + columnExtend - 1);
            context.getWriteSheetHolder().getSheet().addMergedRegionUnsafe(cellRangeAddress);
        }
    }
The number of the current column
fastexcel-core/src/main/java/cn/idev/excel/write/merge/LoopMergeStrategy.java