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perf(tpcdsgen): make conformance suite MD5-only by default, add --full
The conformance scripts always required the full reference `.dat` fixtures, which means every local run and every CI job had to either build the Java implementation and generate ~1 GB of Trino data, or download ~2.4 GB of pre-generated C `dsdgen` data, just to confirm something CI already knew the hash of. For the common "everything matches" case this is pure overhead. The expected MD5 hashes already live in `tests/fixtures/scale-N-{trino,c}/MD5SUMS`, which is checked into the repo. Switch the scripts to use those by default: - `compare-table.sh` and `test-all-tables.sh` now run in MD5-only mode by default: generate the Rust table to a tempfile, MD5 it, and look the expected hash up in `MD5SUMS`. No `.dat` fixture needed. - On mismatch the scripts print both hashes and suggest re-running with `--full` to see a row-level diff. - `--full` preserves the old byte-for-byte behavior: require the fixture, compute MD5s, diff on mismatch. Use it to debug a failing MD5 check. Update the script READMEs and `tpcdsgen/README.md` to document the new default and the `--full` escape hatch. CI is unchanged in this commit — it still calls `generate-fixtures.sh` and `test-all-tables.sh` without `--full`, which is harmless (the download is now wasted, but tests still pass). A follow-up can drop the fixture step from CI to actually realize the speedup. Refs #265. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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‎.github/workflows/tpcdsgen-conformance.yml‎

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- name: Install Rust toolchain
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uses: dtolnay/rust-toolchain@stable
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- name: Set up Java
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uses: actions/setup-java@v5
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with:
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distribution: 'temurin'
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java-version: '11'
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- name: Cache Rust dependencies
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uses: actions/cache@v5
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with:
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restore-keys: |
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${{ runner.os }}-cargo-
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- name: Bootstrap Java TPC-DS implementation
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run: |
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cd tpcdsgen
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./scripts/bootstrap-trino.sh
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- name: Build Rust table generators
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run: |
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cargo build --release -p tpcdsgen
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- name: Generate test fixtures (Java reference data)
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run: |
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cd tpcdsgen
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./scripts/generate-fixtures.sh
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- name: Run conformance tests (Rust vs Java)
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run: |
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cd tpcdsgen
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./scripts/test-all-tables.sh
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- name: Upload test fixtures as artifacts
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if: failure() # Upload fixtures if tests fail for debugging
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uses: actions/upload-artifact@v7
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with:
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name: test-fixtures-trino
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path: tpcdsgen/tests/fixtures/
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retention-days: 7
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# Conformance testing against the C dsdgen reference implementation.
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#
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# Reference data is pre-generated and lives in
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# https://github.com/alamb/tpcds-data (branch sf1).
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# `generate-fixtures.sh --compat c` clones it with --depth 1 and extracts
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# into tpcdsgen/tests/fixtures/scale-1-c/. Rust is then run in
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# --compat c mode and the .dat output is compared byte-for-byte (MD5/diff).
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conformance-tests-c:
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name: Conformance Tests (C dsdgen)
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runs-on: ubuntu-latest
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restore-keys: |
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${{ runner.os }}-cargo-
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- name: Download C dsdgen reference data
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run: |
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cd tpcdsgen
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./scripts/generate-fixtures.sh --compat c --scale 1
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- name: Build Rust table generators
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run: |
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cargo build --release -p tpcdsgen
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cd tpcdsgen
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./scripts/test-all-tables.sh --compat c
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- name: Upload test fixtures as artifacts
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if: failure()
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uses: actions/upload-artifact@v7
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with:
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name: test-fixtures-c
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path: tpcdsgen/tests/fixtures/
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retention-days: 7
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# Performance benchmarks (optional - only on main)
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benchmarks:
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name: Performance Benchmarks

‎tpcdsgen/README.md‎

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**vs. Java / Trino reference (default, `--compat trino`):**
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```bash
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# One-time: clone & build the Java TPC-DS implementation.
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./scripts/bootstrap-trino.sh
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# Default (MD5-only): no Java setup required.
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./scripts/test-all-tables.sh --scale 1
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# Generate Java reference fixtures into tests/fixtures/scale-N-trino/.
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# Byte-for-byte (--full): one-time Java setup + fixture generation.
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./scripts/bootstrap-trino.sh
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./scripts/generate-fixtures.sh
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# Compare Rust output byte-for-byte against the Java fixtures.
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./scripts/test-all-tables.sh --scale 1
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./scripts/test-all-tables.sh --scale 1 --full
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```
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**vs. C dsdgen reference (`--compat c`):**
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```bash
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# One-time: download pre-generated C dsdgen data from
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# Default (MD5-only): no download needed.
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./scripts/test-all-tables.sh --compat c --scale 1
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# Byte-for-byte (--full): one-time data download from
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# https://github.com/alamb/tpcds-data into tests/fixtures/scale-N-c/.
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./scripts/generate-fixtures.sh --compat c --scale 1
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# Compare Rust --compat c output byte-for-byte against the C fixtures.
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./scripts/test-all-tables.sh --compat c --scale 1
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./scripts/test-all-tables.sh --compat c --scale 1 --full
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```
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Both suites also support comparing a single table:
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```bash
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./scripts/compare-table.sh reason # vs. Java
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./scripts/compare-table.sh reason --compat c # vs. C dsdgen
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./scripts/compare-table.sh reason # MD5-only, vs. Java
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./scripts/compare-table.sh reason --compat c # MD5-only, vs. C dsdgen
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./scripts/compare-table.sh reason --full # byte-for-byte, vs. Java
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```
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### Verifying Fixtures with MD5SUMS
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## TPC-DS Reference MD5 Hashes
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These are the canonical MD5 hashes for TPC-DS data generated by the Java reference implementation.
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The Rust implementation must produce byte-for-byte identical output.
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## Scale 1
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Generated with: `java -jar tpcds-*.jar --scale 1`
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| Table | MD5 Hash |
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|-------|----------|
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| call_center.dat | `cc9aabc63eb8603bd7330b6735ed0961` |
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| catalog_page.dat | `0bbac1b8bdcf8ce2d5f0034980ee0196` |
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| catalog_returns.dat | `8460b5abd6b6ceaf6107f217b016fb23` |
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| catalog_sales.dat | `51a0bc401b4b64d94736634b54068240` |
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| customer.dat | `3672ffdefac3cf00413ecef71a753636` |
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| customer_address.dat | `abac2e3925ab9bf66cec3b527a0468ed` |
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| customer_demographics.dat | `8831872c6d56ea9d4f24701f2feaef48` |
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| date_dim.dat | `f3e77714328dcc57302777e72fd7747c` |
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| dbgen_version.dat | `a430da74c2e44926c53deb74e35b23f1` * |
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| household_demographics.dat | `dccf2ff17c5e420021fbf92bf9a0a5ec` |
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| income_band.dat | `db8e8012be51ef81cf215774bec95533` |
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| inventory.dat | `cfefc8724693ec9149f1d5b345fcecc2` |
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| item.dat | `bebbcfd1acecdea16a5a3feb5e4deb96` |
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| promotion.dat | `acb42558d0dc5e0ab6df5a664c1629cf` |
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| reason.dat | `57fe9b8688095bd345cc846ec4400be0` |
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| ship_mode.dat | `791d16af982a67ad170a6b6527e25a35` |
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| store.dat | `80082d03e1b01340e19db3187d8edbd6` |
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| store_returns.dat | `9009d804c02ee839e0b2ecd5fb4ae03f` |
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| store_sales.dat | `f003b3810e042d6dd47f48506616d88d` |
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| time_dim.dat | `a68339c5720d25380b53f6e0f2f72333` |
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| warehouse.dat | `f56789e8b724b989d74e213e0686052f` |
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| web_page.dat | `6feef91675c336d6f25e55ebbdf8c13c` |
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| web_returns.dat | `e45390d32d1698fef71f05f474a4d748` |
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| web_sales.dat | `15f9d835727f3a39a096c346f56e51f7` |
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| web_site.dat | `de5fb00a80673cb44b4b508da75d4bcf` |
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## Scale 10
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Generated with: `java -jar tpcds-*.jar --scale 10`
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| Table | MD5 Hash |
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|-------|----------|
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| call_center.dat | `235909679f4d125e769aa38eb16e9098` |
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| catalog_page.dat | `a5daa0d93ecde8bd9f6ed79cd3b63916` |
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| catalog_returns.dat | `982a8b96fa0d9487015cd137136c8f68` |
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| catalog_sales.dat | `97d5351b430d6c15e3906518315f0787` |
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| customer.dat | `486a030a55d468ef15ff2ff01583e6dc` |
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| customer_address.dat | `860602fea368111009ef08b167e1e299` |
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| customer_demographics.dat | `8831872c6d56ea9d4f24701f2feaef48` |
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| date_dim.dat | `f3e77714328dcc57302777e72fd7747c` |
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| dbgen_version.dat | `8553e926c33f4ad84e4d58fcfd20c48c` * |
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| household_demographics.dat | `dccf2ff17c5e420021fbf92bf9a0a5ec` |
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| income_band.dat | `db8e8012be51ef81cf215774bec95533` |
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| inventory.dat | `4ad3640917c6567038f081bbe2cf0e3e` |
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| item.dat | `bff29691c74ae66eb2dcc3af686fb2ba` |
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| promotion.dat | `b8e8a7741f64edc5d09fdb0453c86705` |
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| reason.dat | `a1fdcd35ca0eddd0d5f37b0e5c2fddb3` |
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| ship_mode.dat | `791d16af982a67ad170a6b6527e25a35` |
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| store.dat | `430a01467a2d55d0e9a1bebad4f1c44b` |
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| store_returns.dat | `4ba001a6066db20066cd198242f92ca1` |
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| store_sales.dat | `ecff92350fa0466e9b9407a1b5ad4020` |
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| time_dim.dat | `a68339c5720d25380b53f6e0f2f72333` |
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| warehouse.dat | `e0c56fe622774d09c9dec42029881ad5` |
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| web_page.dat | `e55695fdb2b86f96cf46e2a55b6f3748` |
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| web_returns.dat | `ac0197593d3f4cc3bb46c8ad7e6cd735` |
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| web_sales.dat | `4da375300bcb0ce8785e1f100fb72efe` |
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| web_site.dat | `4669d52e36cd112af10e137e5d8d7697` |
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\* `dbgen_version.dat` contains timestamps and will differ between runs.
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These are the canonical MD5 hashes the Rust implementation is verified
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against. They are committed alongside the test fixtures so the
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conformance scripts can do an MD5-only check without downloading or
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re-generating the full reference data.
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### Java / Trino reference (`--compat trino`)
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Generated locally from `java -jar tpcds-*.jar --scale N`:
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- Scale 1: [`tests/fixtures/scale-1-trino/MD5SUMS`](tests/fixtures/scale-1-trino/MD5SUMS)
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- Scale 10: [`tests/fixtures/scale-10-trino/MD5SUMS`](tests/fixtures/scale-10-trino/MD5SUMS)
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### C `dsdgen` reference (`--compat c`)
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Sourced from [alamb/tpcds-data](https://github.com/alamb/tpcds-data#md5-checksums):
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- Scale 1: [`tests/fixtures/scale-1-c/MD5SUMS`](tests/fixtures/scale-1-c/MD5SUMS)
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- Scale 2: [`tests/fixtures/scale-2-c/MD5SUMS`](tests/fixtures/scale-2-c/MD5SUMS)
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- Scale 5: [`tests/fixtures/scale-5-c/MD5SUMS`](tests/fixtures/scale-5-c/MD5SUMS)
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- Scale 10: [`tests/fixtures/scale-10-c/MD5SUMS`](tests/fixtures/scale-10-c/MD5SUMS)
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`dbgen_version.dat` contains a generation timestamp and will differ
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between runs; the conformance suite excludes it from comparison.
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## Verification
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