Calc Flow
Calc Flow is a Python calculation library for Arrow tables and stateful streams. Compose typed expressions, SQL, and reusable Python functions in one pipeline. Collect a dataset or iterate its results as data arrives. Rust provides the internal runtime: DataFusion table execution, graph compilation, state, checkpoints, and recovery. Calc Flow Studio, the local FastAPI and React application, lives in the separate calc-flow-studio repository.
Install
CPython 3.9 or newer:
uv add calc-flow-python
Optional array providers:
uv add "calc-flow-python[numpy]"
uv add "calc-flow-python[jax]"
Python quickstart
import pyarrow as pa
import calc_flow as cf
data = pa.table({"a": [1, 3], "b": [2, 4]})
result = cf.compute(data, lambda t: t.select(total=t["a"] + t["b"]))
assert result.to_pydict() == {"total": [3, 7]}
cf.compute infers the supported Arrow schema and returns a pyarrow.Table.
The builder receives a TableExpr; indexing selects columns, operators compose
calculations, and select, with_columns, and filter return new declarations.
Use await cf.compute_async(...) in an event loop.
Add a read-only SQL stage with t.sql(query), using the local alias input.
Use cf.sql(query, orders=orders, fees=fees) for explicit named table declarations.
SQL returns another TableExpr, so pipe, column operators, and table methods
compose before and after it. expression.pipe(function, *args, **kwargs) calls
an ordinary synchronous function once while building the calculation.
For streams, use async with output.stream(batches()) as results, then
async for table in results. One native job retains state across batches and
owns cleanup. Declared event-time inputs default to validated nondecreasing
timestamps and watermarks that produce finalized results before EOF. Use
watermarks for explicit disorder or source-provided progress; see
watermark policies.
A Program yields named StreamOutput events for multiple
outputs. The convenience stream uses temporary checkpoints and best-effort
iterable delivery; durable recovery uses explicit source/sink bindings and a
managed checkpoint root.
Continue with SQL and reusable pipelines
and the first streaming pipeline.
The runnable examples cover SQL composition,
stateful streaming, and
named streaming outputs. The
connector examples cover all seven transports
and every supported read/write direction, with service setup and output checks.
The default wheel includes file; other transports require native build features.
Expression workflows cover financial features,
recovery, static matrices, and joins. Use explicit Runtime, plans, Batch,
UDFs, and PipelineBuilder for runtime integrations and diagnostics.
The Rust runtime reference and
native examples cover implementation and
extension work. The calc-flow crate's exports remain available to those users.
Architecture
crates/calc-flow (Rust core: Batch, graph compiler, DataFusion, runners, stores)
├─ crates/calc-flow-connectors (trusted transport implementations)
└─ crates/calc-flow-python (PyO3 _native binding + registered connectors)
└─ python/calc_flow (Python expressions, Arrow execution + integrations)
The native dependency edges are crates/calc-flow ← calc-flow-connectors and
crates/calc-flow ← crates/calc-flow-python ← python/calc_flow.
The Python package is not a second engine.
| Path | Purpose |
|---|---|
crates/calc-flow/ |
Native core: batches, ports/operators, graph compiler, DataFusion runtime, UDF/provider registries, runners, checkpoints, project stores |
crates/calc-flow-connectors/ |
Trusted file, Kafka, PostgreSQL, MySQL, ClickHouse, HTTP, and WebSocket connectors behind feature gates |
crates/calc-flow-python/ |
PyO3 binding exposing the core as calc_flow._native |
python/calc_flow/ |
Python expressions and SQL, pipe, Arrow collection, owned stream results, lowering, and runtime integrations |
schemas/ |
project-v3.schema.json, the canonical generated project contract |
examples/ |
Executable Python expression and integration examples |
benchmarks/ |
Benchmark workloads; scheduled regression gates and informational comparisons |
Data and execution model
- Table data is Arrow-backed. The Rust runtime executes row expressions and SQL with DataFusion and owns native rolling, window, and cross-section operators.
- NumPy and JAX are optional Python array providers. They are registered explicitly and evaluate a bounded, allowlisted expression language.
- Raw tables or arrays never cross a graph or runner boundary; they are wrapped
in immutable
Batchenvelopes. - Project documents are strict, data-only JSON/YAML with
format_version: 3. They select batch or stream runtime mode explicitly; stream documents reference registered connectors and named secrets without embedding credentials, callables, import paths, or table backend selectors. - Table and mixed graph runs own one run-scoped DataFusion session. External-only NumPy/JAX runs own no DataFusion configuration, UDF state, or runtime and return an empty DataFusion metrics list.
- Convenience batch calls return Arrow tables. Explicit plan execution returns
named
Batchoutputs, per-node timings, metadata, and DataFusion diagnostics. - Python executions accept reusable frozen
ExecutionOptionswith deep-copied strict-JSON settings and a cooperative, timezone-aware deadline normalized to UTC. TableExpr.streamandProgram.streamown a single native job with bounded backpressure. SQL accepts one alias in a stream. Ordinary aggregates andGROUP BYemit full cumulative snapshots; other SQL runs per batch.Program(name, engine="sql")orProgram(name, engine="streaming")fixes the engine when the immutable program is created.Program.executereturns finite named tables or owned streaming results, respectively. Calls for the other engine fail.- The source-driven
StreamingRunnerconsumes aStreamExecutionPlan, owns async source/sink bindings, and returns a one-ownerStreamingJob. - Managed epoch checkpoints use
LocalStateBackendsegments and strict v3CheckpointManifestdocuments. Exactly-once compatibility is proved per requested output; ordinary sinks can provide at-least-once delivery on a lossless replayable route. Async iterable convenience inputs provide best effort.
The capabilities and execution model are introduced in docs/introduction.md. The complete component and lifecycle design is in docs/design.md, and the practical continuous tutorial is docs/streaming-guide.md.
Trusted extensions
Python applications may register trusted vectorized DataFusion scalar UDFs on
a Runtime. Every registration declares provider, name, version, exact Arrow
input types, return type, and volatility. Graph nodes select registrations
explicitly with (provider, name, version) references. Serialized projects
contain references only.
Runtime extension authors use UdfRegistry for native DataFusion UDFs and
ProviderRegistry for explicitly registered external operators.
Project contracts
Calc Flow accepts strict project-v3 documents. Read projects and persistence for validation, serialization, and reloading a graph. Historical changes are recorded in CHANGELOG.md.
Development
Large Cargo and Maturin outputs should use the repository target/ tree.
The complete CI/full-verification command reference is below. Local changes use
the smallest affected checks under AGENTS.md Verification;
full regression and Rust 90% coverage belong to
CI; routine benchmark measurements run on their own schedule:
uv sync --extra dev
cargo fmt --all --check
cargo clippy --workspace --lib --bins --tests --examples --all-features -- -D warnings
uv run python scripts/run_rust_tests.py
CALC_FLOW_CONNECTOR_CONTAINERS=1 \
CALC_FLOW_KAFKA_BOOTSTRAP=localhost:9092 \
CALC_FLOW_PG_TEST_URL=postgresql://postgres:postgres@localhost:5432/postgres \
CALC_FLOW_MYSQL_TEST_URL=mysql://root:calcflow-test@localhost:3306/calcflow \
CH_TEST_URL=http://localhost:8123 \
uv run python scripts/run_rust_coverage.py
RUSTDOCFLAGS="-D warnings" cargo doc --workspace --all-features --no-deps
uv run maturin develop
JAX_PLATFORMS=cpu uv run pytest python/tests -q
JAX_PLATFORMS=cpu uv run python scripts/run_examples.py
uv run ruff check .
uv run ruff format --check .
Regular CI runs cargo audit, cargo deny --locked check, core package
inspectors, and isolated wheel smoke tests. The Python release workflow builds,
verifies, and publishes core package artifacts. See AGENTS.md for
the maintained repository commands and constraints.
Documentation
- Documentation index — reading order for all published docs
- Introduction — capabilities, vocabulary, and execution modes
- getting started — installation and smoke test
- Executable examples — verified example matrix and runner
- Batch calculations — expressions, SQL, UDFs, and async execution
- Arrays and matrices — NumPy/JAX and static weights
- Continuous streaming — source-to-recovery tutorial
- Connectors — transport configuration and guarantees
- Projects and persistence — JSON/YAML and file stores
- Python API — Python surface and examples
- Expression workflows — batch, stream, recovery, static matrix, and performance workflows
- Rust runtime reference — native surface and examples
- API reference — supported surfaces at a glance
- Expression API — declarations, analysis, and compile requirements
- Design and architecture — component ownership and execution design
- Verification — documentation, examples, and implementation checks
- Python release guide — packaging, verification, Trusted Publishers, and the PyPI procedure
- Benchmark suite — scheduled tables, scale matrices, external-engine comparisons and historical regression evidence
- Changelog — the single history of changes
License
Apache-2.0 — see LICENSE.
1 maintainer
Metadata
1 maintainer
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