LakeSoul Python Support

Native Writer

The native writer accepts PyArrow batches, tables, and record batch readers. It writes data files and returns their metadata; publishing those files to the LakeSoul metadata service is a separate operation.

import pyarrow as pa

from lakesoul.io import IOConfig, Writer

table = pa.table({"id": [1, 2], "value": ["a", "b"]})
config = IOConfig(
    path="./output",
    schema=table.schema,
    format="parquet",
)

with Writer(config) as writer:
    writer.write(table)

print(writer.result.files)

Ray Writer

Importing lakesoul.ray registers a Pythonic write method on Ray datasets. The target LakeSoul table must already exist. Data files are written by Ray tasks, then committed to LakeSoul metadata by the driver after every task succeeds.

import ray
import lakesoul.ray

dataset = ray.data.from_items(
    [
        {"id": 1, "value": "a"},
        {"id": 2, "value": "b"},
    ]
)
dataset.write_lakesoul(
    "target_table",
    namespace="default",
    format="parquet",
)

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