Generally speaking, only one pillar is not a big problem. The most taboo thing about having columns at home is that the columns are symmetrically distributed on both sides of the door, such as funeral candles next to the photo frame at the funeral. This is very unlucky and can only be avoided by changing the position of the door.
If there is only one pillar, unless it blocks the aisle or something (very few), there is generally no taboo in geomantic omen.