Read Primitives — String Substring

Read Primitives benchmark · all Read Primitives queries

String substring extraction

Representative SQL

Rendered for DataFusion with default parameters.

SELECT
  c_custkey,
  SUBSTRING(c_phone FROM 1 FOR 3) AS country_code
FROM customer
LIMIT 100

Representative DataFrame

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

def string_substring_expression_impl(ctx: DataFrameContext) -> Any:
    return (
        ctx.get_table("customer")
        .select(ctx.col("c_custkey"), ctx.col("c_phone").str.slice(0, 3).alias("country_code"))
        .limit(100)
    )

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['string_substring'])

For the DataFrame form:

from benchbox.core.query_catalog import get_dataframe_render

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

Source

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