| from datetime import datetime | |
| import polars as pl | |
| from polars_queries import utils | |
| Q_NUM = 8 | |
| def q(): | |
| part_ds = utils.get_part_ds() | |
| supplier_ds = utils.get_supplier_ds() | |
| line_item_ds = utils.get_line_item_ds() | |
| orders_ds = utils.get_orders_ds() | |
| customer_ds = utils.get_customer_ds() | |
| nation_ds = utils.get_nation_ds() | |
| region_ds = utils.get_region_ds() | |
| n1 = nation_ds.select(["n_nationkey", "n_regionkey"]) | |
| n2 = nation_ds.clone().select(["n_nationkey", "n_name"]) | |
| q_final = ( | |
| part_ds.join(line_item_ds, left_on="p_partkey", right_on="l_partkey") | |
| .join(supplier_ds, left_on="l_suppkey", right_on="s_suppkey") | |
| .join(orders_ds, left_on="l_orderkey", right_on="o_orderkey") | |
| .join(customer_ds, left_on="o_custkey", right_on="c_custkey") | |
| .join(n1, left_on="c_nationkey", right_on="n_nationkey") | |
| .join(region_ds, left_on="n_regionkey", right_on="r_regionkey") | |
| .filter(pl.col("r_name") == "AMERICA") | |
| .join(n2, left_on="s_nationkey", right_on="n_nationkey") | |
| .filter( | |
| pl.col("o_orderdate").is_between( | |
| datetime(1995, 1, 1), datetime(1996, 12, 31) | |
| ) | |
| ) | |
| .filter(pl.col("p_type") == "ECONOMY ANODIZED STEEL") | |
| .select( | |
| [ | |
| pl.col("o_orderdate").dt.year().alias("o_year"), | |
| (pl.col("l_extendedprice") * (1 - pl.col("l_discount"))).alias( | |
| "volume" | |
| ), | |
| pl.col("n_name").alias("nation"), | |
| ] | |
| ) | |
| .with_columns( | |
| pl.when(pl.col("nation") == "BRAZIL") | |
| .then(pl.col("volume")) | |
| .otherwise(0) | |
| .alias("_tmp") | |
| ) | |
| .group_by("o_year") | |
| .agg((pl.sum("_tmp") / pl.sum("volume")).round(2).alias("mkt_share")) | |
| .sort("o_year") | |
| ) | |
| utils.run_query(Q_NUM, q_final) | |
| if __name__ == "__main__": | |
| q() | |