As Ed Koch awaits going under the knife for a heart operation in the next couple days, he has the same old playful, dark, New York sense of humor as ever when talking to reporters at his Columbia-Presbyterian hospital room. The former mayor said to the News, "Whatever God wants, God will have. If He wants me to hang around, I'll hang around. If He wants to have some legal [or political] advice, He'll take me." Koch was going in for routine angioplasty when doctors told him he would have to repair damage to his aortic valve stemming from a heart attack he had in 1999. Koch said he loves Columbia because it's the hospital where "the food is good" and added, "I'm looking at the Hudson - oh, wait a minute, Henry's going by... Henry Hudson. He's waving."