Read Primitives — Empty Build Side Join

Read Primitives benchmark · all Read Primitives queries

Join when build side produces no rows (edge case handling)

Representative SQL

Rendered for DataFusion with default parameters.

SELECT
  l.*
FROM lineitem AS l
LEFT JOIN (
  SELECT
    *
  FROM orders
  WHERE
    o_totalprice < 0
) AS o
  ON l.l_orderkey = o.o_orderkey

Representative DataFrame

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

def empty_build_join_expression_impl(ctx: DataFrameContext) -> Any:
    col, lit = ctx.col, ctx.lit
    empty_orders = ctx.get_table("orders").filter(col("o_totalprice") < lit(0)).select("o_orderkey")
    return (
        ctx.get_table("lineitem")
        .join(empty_orders, left_on="l_orderkey", right_on="o_orderkey", how="left")
        .select(*_LINEITEM_COLS)
    )

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 ReadPrimitives

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

For the DataFrame form:

from benchbox.core.query_catalog import get_dataframe_render

print(get_dataframe_render('read_primitives', 'empty_build_join', family="expression").source)  # or family="pandas"

Source

Query text: benchbox/core/read_primitives/queries.py