      let childSize = this.computeRenderDataRec(cols, child, childPos, depth + 1, result, childLeft, childRight)
                    childPos += childSize
                    size += childSize
                }
            } else {
                for (let i = depth + 1; i < result.length; i++)
                    result[i].push({id: colId, span: 1, leftBd: leftBorder, rightBd: rightBorder, empty: true})
                size = 1
            }
            let left = leftBorder
            let right = rightBo