TPC-H Skew Q6 — Forecasting Revenue Change

TPC-H Skew benchmark · all TPC-H Skew queries

Revenue increase from eliminating discounts

Representative SQL

Rendered for DataFusion with default parameters.

SELECT
  SUM(l_extendedprice * l_discount) AS revenue
FROM lineitem
WHERE
  l_shipdate >= CAST('1994-01-01' AS DATE)
  AND l_shipdate < CAST('1994-01-01' AS DATE) + INTERVAL '1 YEAR'
  AND l_discount BETWEEN 0.06 - 0.01 AND 0.06 + 0.01
  AND l_quantity < 24

Representative DataFrame

Expression family (Polars, PySpark, DataFusion), default parameters.

def q6_expression_impl(ctx: DataFrameContext) -> Any:
    lineitem = ctx.get_table("lineitem")
    col = ctx.col
    lit = ctx.lit

    params = get_tpch_parameters(6)
    start_date = params["start_date"]
    end_date = params["end_date"]
    discount_low = params["discount_low"]
    discount_high = params["discount_high"]
    quantity_limit = params["quantity_limit"]

    return (
        lineitem.filter(
            (col("l_shipdate") >= lit(start_date))
            & (col("l_shipdate") < lit(end_date))
            & (col("l_discount") >= lit(discount_low))
            & (col("l_discount") <= lit(discount_high))
            & (col("l_quantity") < lit(quantity_limit))
        )
        .select((col("l_extendedprice") * col("l_discount")).alias("revenue"))
        .sum()
    )

Get the exact query for your run

The blocks above are representative. To get the precise statement a specific platform runs at a specific scale, substitute your own values:

from benchbox import TPCHSkew

bench = TPCHSkew(scale_factor=0.01)            # your scale factor
queries = bench.get_queries(dialect="datafusion")   # your platform's dialect; drop dialect= for native SQL
print(queries['6'])

Parameter substitution for this benchmark is seed-driven; pass a seed for a specific stream’s parameters:

print(bench.get_query(6, scale_factor=0.01, seed=42, dialect="datafusion"))

For the DataFrame form:

from benchbox.core.query_catalog import get_dataframe_render

print(get_dataframe_render('tpch_skew', '6', family="expression").source)  # or family="pandas"

Source

Query text: benchbox/_binaries/tpc-h/templates/queries/6.sql