polars_queries/q9.py

from datetime import datetime

import polars as pl

from polars_queries import utils

Q_NUM = 9


def q():
    part_ds = utils.get_part_ds()
    supplier_ds = utils.get_supplier_ds()
    line_item_ds = utils.get_line_item_ds()
    part_supp_ds = utils.get_part_supp_ds()
    orders_ds = utils.get_orders_ds()
    nation_ds = utils.get_nation_ds()

    q_final = (
        line_item_ds.join(supplier_ds, left_on="l_suppkey", right_on="s_suppkey")
        .join(
            part_supp_ds,
            left_on=["l_suppkey", "l_partkey"],
            right_on=["ps_suppkey", "ps_partkey"],
        )
        .join(part_ds, left_on="l_partkey", right_on="p_partkey")
        .join(orders_ds, left_on="l_orderkey", right_on="o_orderkey")
        .join(nation_ds, left_on="s_nationkey", right_on="n_nationkey")
        .filter(pl.col("p_name").str.contains("green"))
        .select(
            [
                pl.col("n_name").alias("nation"),
                pl.col("o_orderdate").dt.year().alias("o_year"),
                (
                    pl.col("l_extendedprice") * (1 - pl.col("l_discount"))
                    - pl.col("ps_supplycost") * pl.col("l_quantity")
                ).alias("amount"),
            ]
        )
        .group_by(["nation", "o_year"])
        .agg(pl.sum("amount").round(2).alias("sum_profit"))
        .sort(by=["nation", "o_year"], descending=[False, True])
    )

    utils.run_query(Q_NUM, q_final)


if __name__ == "__main__":
    q()