1)
Who said "u'Mefivoshes Yochal Al Shulchani"?
1.
Rashi: David said so.
2.
Radak: Tziva said so. Even though [you said] "he will eat at my table", I will do like you commanded, and work the entire inheritance for Mefivoshes and his sons.
3.
Malbim: Tziva said so. "He will eat at my table", i.e. what I will prepare for him from his property. It will be great, "like one of the king's sons."