private void removeAllColumns() {
		if (columnModel instanceof GTableColumnModel) {
			((GTableColumnModel) columnModel).removeAllColumns();
			return;
		}

		// use the default removal method
		while (columnModel.getColumnCount() > 0) {
			columnModel.removeColumn(columnModel.getColumn(0));
		}
	}
Installs the default {@link TableCellRenderer}s for known Ghidra table cell data classes.
Subclasses can override this method to add additional types or to change the default
associations.
Ghidra/Framework/Docking/src/main/java/docking/widgets/table/GTable.java