Allow the minimal feature to 1 in column sampling (#3197)
Allow the minimal feature to 1 in column sampling (#3197)

Co-authored-by: StrikerRUS <c256f4532c1890487c50410631b1b890b90daa3a@hotmail.com>
henry0312/LightGBM,microsoft/LightGBM,henry0312/LightGBM,microsoft/LightGBM,microsoft/LightGBM,henry0312/LightGBM,microsoft/LightGBM,henry0312/LightGBM,henry0312/LightGBM,microsoft/LightGBM