How to Read a Parquet File from S3 Using Trino (Presto)

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Discover how to efficiently read `Parquet` files stored in Amazon S3 using Trino (formerly Presto) with our step-by-step guide.
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How to Read a Parquet File from S3 Using Trino (Presto)

If you’re a beginner venturing into the world of data processing using Trino (formerly known as Presto) and Amazon S3, you might find yourself wondering how to read Parquet files directly from your S3 bucket. This blog will address this common issue and guide you through the solution step by step.

The Problem

While using Apache Drill, you can easily execute a query to select data from a Parquet file stored in S3 with a simple command:

[[See Video to Reveal this Text or Code Snippet]]

However, when attempting to do the same in Trino, you may encounter errors. The challenge lies in how Trino handles Parquet files and the required setup needed to access them from S3.

Understanding Trino's Structure for S3 Access

In Trino, to access Parquet files:

Create an S3 bucket and upload your files into it.

Configure the Trino S3 connector by creating a catalog and schema that allows you to point to your data files.

Create an external table in Trino pointing to the specific folder in your S3 bucket where your Parquet files are stored.

Steps to Read Parquet Files in Trino

Follow these steps to successfully read Parquet files from your S3 bucket using Trino:

Step 1: Set Up Your S3 Bucket

Ensure you have your Parquet files uploaded to a specified folder in your S3 bucket.

Step 2: Create an External Table in Trino

To read your data, you need to create an external table that points to the S3 location of the files and specifies the data format. Here’s how to do it:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Query Your Table

Once your external table is created, you can use the Trino command line interface (CLI) to query the data:

[[See Video to Reveal this Text or Code Snippet]]

Creating Multiple Tables (Optional)

If desired, you can create multiple tables for different attributes from the Parquet file. Here’s how you can do that:

[[See Video to Reveal this Text or Code Snippet]]

Then, you can query each table separately:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

Accessing and reading data from Parquet files on S3 using Trino involves understanding how to set up the necessary configurations and create external tables. By following the above steps, you'll be able to streamline your data querying process in Trino.

If you have further questions or run into issues, don't hesitate to reach out for help in communities or forums dedicated to Trino and data processing!