dataframe add column with ur prefer position

..... For spark training & placement pls contact /whatsapp +91-8500002025 or +91-9247159150 in pyspark if i execute df.withColumn("full_name", concat_ws("_",col("first_nme"), col("last_name"))) its append (end of the dataframe) but i want to add that column based on specific position, like second position i want to add that new column how to do explained in this program. For more tips get in touch in these groups https://chat.whatsapp.com/CT6ykRfFuNn4ysuexlzpsa https://t.me/sreyobhilashi or directly whatsapp me at https://wa.me/91-8500002025?text=I_want_to_learn_bigdata