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+# Using Delta Lake with Sail
+
+[Sail](https://github.com/lakehq/sail) is an open-source multimodal distributed compute framework, built in Rust,
+unifying batch, streaming, and AI workloads. For seamless adoption, Sail offers a drop-in replacement for the Spark SQL
+and DataFrame APIs in both single-host and distributed settings. You can use Sail for both ad-hoc queries on your laptop
+and large-scale data processing jobs in a cluster.
+
+Delta Lake is a natural fit for Sail. Delta Lake provides a reliable storage layer with strong data management
+guarantees, while Sail focuses on flexible, unified multimodal compute. By combining the two, you can start with a
+familiar PySpark client, while benefiting from Sail’s native support for Delta Lake tables and ensuring interoperability
+with existing Delta datasets.
+
+## Getting Started with Sail
+
+### Installing Sail
+
+The easiest way to get started is by installing PySail and the PySpark client.
+
+```bash
+pip install "pysail"
+pip install "pyspark-client"
+```
+
+### Using the Sail Library
+
+You can use the Sail library to start a Spark Connect server and connect to it using PySpark.
+
+```python
+from pysail.spark import SparkConnectServer
+from pyspark.sql import SparkSession
+
+server = SparkConnectServer()
+server.start()
+_, port = server.listening_address
+
+spark = SparkSession.builder.remote(f"sc://localhost:{port}").getOrCreate()
+```
+
+### Note
+
+In all the examples below, `spark` refers to the Spark session connected to the Sail server.
+
+## Basic Delta Lake Usage in Sail
+
+### DataFrame API
+
+```python
+path = "file:///tmp/sail/users"
+df = spark.createDataFrame(
+    [(1, "Alice"), (2, "Bob")],
+    schema="id INT, name STRING",
+)
+
+# This creates a new table or overwrites an existing one.
+df.write.format("delta").mode("overwrite").save(path)
+# This appends data to an existing Delta table.
+df.write.format("delta").mode("append").save(path)
+
+df = spark.read.format("delta").load(path)
+df.show()
+```
+
+### SQL
+
+```python
+spark.sql("""
+CREATE TABLE users (id INT, name STRING)
+USING delta
+LOCATION 'file:///tmp/sail/users'
+""")
+
+spark.sql("INSERT INTO users VALUES (1, 'Alice'), (2, 'Bob')")
+spark.sql("SELECT * FROM users").show()
+```
+
+## Data Partitioning
+
+Partitioned Delta tables organize data into directories based on the values of one or more columns. This improves query
+performance by skipping data files that do not match the filter conditions.
+
+### DataFrame API
+
+```python
+path = "file:///tmp/sail/metrics"
+df = spark.createDataFrame(
+    [(2024, 1.0), (2025, 2.0)],
+    schema="year INT, value FLOAT",
+)
+
+df.write.format("delta").mode("overwrite").partitionBy("year").save(path)
+
+df = spark.read.format("delta").load(path).filter("year > 2024")
+df.show()
+```
+
+### SQL
+
+```python
+spark.sql("""
+CREATE TABLE metrics (year INT, value FLOAT)
+USING delta
+LOCATION 'file:///tmp/sail/metrics'
+PARTITIONED BY (year)
+""")
+
+spark.sql("INSERT INTO metrics VALUES (2024, 1.0), (2025, 2.0)")
+spark.sql("SELECT * FROM metrics WHERE year > 2024").show()
+```
+
+## Schema Evolution
+
+Delta Lake handles schema evolution gracefully. By default, if you try to write data with a different schema than the
+one of the existing Delta table, an error will occur. You can enable schema evolution by setting the `mergeSchema`
+option to `true` when writing data. In this case, if you change the data type of an existing column to a compatible
+type, or add a new column, Delta Lake will automatically update the schema of the table.
+
+```python
+df.write.format("delta").mode("append").option("mergeSchema", "true").save(path)
+```
+
+You can also use the `overwriteSchema` option to overwrite the schema of an existing Delta table. But this works only if
+you set the write mode to `overwrite`.
+
+```python
+df.write.format("delta").mode("overwrite").option("overwriteSchema", "true").save(path)
+```
+
+## Time Travel
+
+You can use the time travel feature of Delta Lake to query historical versions of a Delta table.
+
+```python
+df = spark.read.format("delta").option("versionAsOf", "0").load(path)
+```
+
+## Contribute to Sail
+
+You can refer to the [Sail documentation](https://docs.lakesail.com/sail/latest/) for more information, such as reading
+or writing Delta tables stored in various object storages supported by Sail.
+
+Excited about Sail and want to contribute? Join them on [GitHub](https://github.com/lakehq/sail)! 🚀
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