Analysis of information sources in references of the Wikipedia article "압살롬" in Korean language version.
It is probable that it was a good while before he had a child. Then, despairing of having one, he set up the pillar (2 Samuel 18:18) to bear up his name, but afterwards he had three sons and one daughter (2 Samuel 14:27). Or perhaps these sons, while he was hatching his rebellion, were all cut off by the righteous hand of God, and he thereupon set up that monument.