datafusion/tests/test_substrait.py

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import pyarrow as pa

from datafusion import SessionContext
from datafusion import substrait as ss
import pytest


@pytest.fixture
def ctx():
    return SessionContext()


def test_substrait_serialization(ctx):
    batch = pa.RecordBatch.from_arrays(
        [pa.array([1, 2, 3]), pa.array([4, 5, 6])],
        names=["a", "b"],
    )

    ctx.register_record_batches("t", [[batch]])

    assert ctx.tables() == {"t"}

    # For now just make sure the method calls blow up
    substrait_plan = ss.substrait.serde.serialize_to_plan(
        "SELECT * FROM t", ctx
    )
    substrait_bytes = substrait_plan.encode()
    assert type(substrait_bytes) is bytes
    substrait_bytes = ss.substrait.serde.serialize_bytes(
        "SELECT * FROM t", ctx
    )
    substrait_plan = ss.substrait.serde.deserialize_bytes(substrait_bytes)
    logical_plan = ss.substrait.consumer.from_substrait_plan(
        ctx, substrait_plan
    )

    # demonstrate how to create a DataFrame from a deserialized logical plan
    df = ctx.create_dataframe_from_logical_plan(logical_plan)

    substrait_plan = ss.substrait.producer.to_substrait_plan(
        df.logical_plan(), ctx
    )