def calculate_prices(df: DataFrame):
"""[Calculate minimum, maximum price and row count and save it in csv]
Args:
df (DataFrame): [spark dataframe]
"""
(df.agg(
f.min('price').alias('min_price'),
f.max('price').alias('max_price'),
f.count(f.lit(1)).alias('row_count')).coalesce(1).write.option(
"header", "true").format('csv').save('out/out_2_2.txt'))
