dataset-manager

Testing & Quality

Use this skill to generate benchmark datasets (TPC-H, TPC-DS, etc.). Trigger when the user needs test data at a specific scale factor for benchmarking or testing. Supports parquet and duckdb output formats.

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Dataset Generator

Generate benchmark datasets by running the corresponding shell script under test/<benchmark>_performance/.

Gather Parameters

Parse $ARGUMENTS for:

Benchmark: name from the registry below (first positional arg)
Scale factor: integer (second positional arg)
Format: --format duckdb|parquet (optional — each benchmark has a default)
Cluster (TPC-H duckdb only): --cluster / --cluster-keys <spec> (optional — physically sorts tables so row-group pruning works; errors with --format parquet)
Output path: --output <path> (optional — scripts have sensible defaults)

If any required parameter (benchmark, scale factor) is missing, ask the user.

Benchmark Registry

Each entry follows the same structure: script location, command template, supported formats, defaults, and prerequisites.

TPC-H

Field	Value
Script	`test/tpch_performance/generate_tpch_data.sh`
Default format	`parquet`
Formats	`parquet` (tpchgen-rs), `duckdb` (DuckDB `dbgen()`)
Default output (parquet)	`test_datasets/tpch_parquet_sf<SF>`
Default output (duckdb)	`test_datasets/tpch_sf<SF>.duckdb`
Default output (duckdb + `--cluster`)	`test_datasets/tpch_sf<SF>_sorted.duckdb`
Prerequisites	Parquet: pixi env (rust, python, pyarrow). DuckDB: `build/release/duckdb`

cd test/tpch_performance && pixi run bash generate_tpch_data.sh <SF> --format <FORMAT> [--cluster] [--cluster-keys <spec>] [--output <path>]

Notes:

If the parquet output directory already exists, the script skips generation
--cluster (duckdb only) physically sorts tables at load so each row group's per-column min/max becomes selective — this is what makes Sirius's native-scan row-group pruning skip work on date-filtered queries. It writes a distinct tpch_sf<SF>_sorted.duckdb so it can coexist with the unsorted dataset.
Default cluster keys: lineitem:l_shipdate,orders:o_orderdate. Override with --cluster-keys "table:col,table:col,..." (implies --cluster).
--cluster errors if combined with --format parquet (tpchgen-rs writes decimals as FIXED_LEN_BYTE_ARRAY, which disables Sirius row-group pruning for the whole file).

TPC-DS

Field	Value
Script	`test/tpcds_performance/generate_tpcds_data.sh`
Default format	`duckdb`
Formats	`duckdb`, `parquet`
Default output (duckdb)	`test_datasets/tpcds_sf<SF>.duckdb`
Default output (parquet)	`test_datasets/tpcds_parquet_sf<SF>`
Prerequisites	`build/release/duckdb`

cd test/tpcds_performance && bash generate_tpcds_data.sh <SF> --format <FORMAT> [--output <path>]

Notes:

Also extracts TPC-DS query files to test/tpcds_performance/queries/q{1..99}.sql

Prerequisites

For any benchmark that requires the DuckDB binary, check before running:

test -x build/release/duckdb

If missing, tell the user to build first: CMAKE_BUILD_PARALLEL_LEVEL=$(nproc) make

Report Results

Benchmark name
Output path
Format used
Whether generation was skipped (output already existed) or completed