q22_global_sales_opportunity.py

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"""
TPC-H Problem Statement Query 22:

This query counts how many customers within a specific range of country codes have not placed
orders for 7 years but who have a greater than average “positive” account balance. It also reflects
the magnitude of that balance. Country code is defined as the first two characters of c_phone.

The above problem statement text is copyrighted by the Transaction Processing Performance Council
as part of their TPC Benchmark H Specification revision 2.18.0.
"""

from datafusion import SessionContext, WindowFrame, col, lit, functions as F
from util import get_data_path

NATION_CODES = [13, 31, 23, 29, 30, 18, 17]

# Load the dataframes we need

ctx = SessionContext()

df_customer = ctx.read_parquet(get_data_path("customer.parquet")).select(
    "c_phone", "c_acctbal", "c_custkey"
)
df_orders = ctx.read_parquet(get_data_path("orders.parquet")).select("o_custkey")

# The nation code is a two digit number, but we need to convert it to a string literal
nation_codes = F.make_array(*[lit(str(n)) for n in NATION_CODES])

# Use the substring operation to extract the first two characters of the phone number
df = df_customer.with_column("cntrycode", F.substring(col("c_phone"), lit(0), lit(3)))

# Limit our search to customers with some balance and in the country code above
df = df.filter(col("c_acctbal") > lit(0.0))
df = df.filter(~F.array_position(nation_codes, col("cntrycode")).is_null())

# Compute the average balance. By default, the window frame is from unbounded preceding to the
# current row. We want our frame to cover the entire data frame.
window_frame = WindowFrame("rows", None, None)
df = df.with_column(
    "avg_balance", F.window("avg", [col("c_acctbal")], window_frame=window_frame)
)

df.show()
# Limit results to customers with above average balance
df = df.filter(col("c_acctbal") > col("avg_balance"))

# Limit results to customers with no orders
df = df.join(df_orders, left_on="c_custkey", right_on="o_custkey", how="anti")

# Count up the customers and the balances
df = df.aggregate(
    [col("cntrycode")],
    [
        F.count(col("c_custkey")).alias("numcust"),
        F.sum(col("c_acctbal")).alias("totacctbal"),
    ],
)

df = df.sort(col("cntrycode").sort())

df.show()