Function create_streaming_context 

pub fn create_streaming_context() -> SessionContext

Creates a DataFusion session context configured for streaming queries.

The context is configured with:

• Batch size of 8192 (balanced for streaming throughput)
• Single partition (streaming sources are typically not partitioned)
• All streaming UDFs registered (TUMBLE, HOP, SESSION, WATERMARK)

The watermark UDF is initialized with no watermark set (returns NULL). Use register_streaming_functions_with_watermark to provide a live watermark source.

Example

let ctx = create_streaming_context();
ctx.register_table("events", provider)?;
let df = ctx.sql("SELECT * FROM events").await?;