Explanation
Azure Stream Analytics is a fully managed PaaS offering that enables real-time analytics and complex event processing on fast moving data streams.
By outputting data in parquet format into a blob store or a data lake, you can take advantage of Azure Stream Analytics to power large scale streaming extract, transfer, and load (ETL), to run batch processing, to train machine learning algorithms, or to run interactive queries on your historical data.
Reference:
https://azure.microsoft.com/en-us/blog/new-capabilities-in-stream-analytics-reduce-development-time-for-big-da