Metastore example

[tarun-google]

Adding Example for Batch Write with Iceberg BigQuery Metastore. Sample run for the pipeline is attached below

---

GitHub Actions Tests Status (on master branch)

See CI.md for more information about GitHub Actions CI or the workflows README to see a list of phrases to trigger workflows.

[gemini-code-assist]

Summary of Changes

Hello @tarun-google, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

I've added a new example demonstrating how to perform a batch write operation to an Iceberg table, leveraging the BigQuery Metastore catalog within an Apache Beam pipeline. This example showcases reading data from a public BigQuery dataset, processing it, and then writing the aggregated results to a new Iceberg table managed by BigQuery Metastore.

Highlights

• New Iceberg Batch Write Example: I've introduced IcebergBatchWriteExample.java, a new Java example that illustrates a complete data pipeline.
• BigQuery Metastore Integration: This example specifically highlights the integration with BigQuery Metastore for managing Iceberg tables.
• Dependency Update: I've updated examples/java/build.gradle to include the necessary iceberg:bqms runtime dependency, enabling the BigQuery Metastore functionality.

Using Gemini Code Assist

The full guide for Gemini Code Assist can be found on our documentation page, here are some quick tips.

Invoking Gemini

You can request assistance from Gemini at any point in your pull request via creating an issue comment (i.e. comment on the pull request page) using either /gemini <command> or @gemini-code-assist <command>. Below is a summary of the supported commands.

Feature	Command	Description
Code Review	/gemini review	Performs a code review for the current pull request in its current state.
Pull Request Summary	/gemini summary	Provides a summary of the current pull request in its current state.
Comment	@gemini-code-assist	Responds in comments when explicitly tagged, both in issue comments and review comments.
Help	/gemini help	Displays a list of available commands.

Customization

To customize Gemini Code Assist for GitHub experience, repository maintainers can create a configuration file and/or provide a custom code review style guide (such as PEP-8 for Python) by creating and adding files to a .gemini/ folder in the base of the repository. Detailed instructions can be found here.

Limitations & Feedback

Gemini Code Assist may make mistakes. Please leave feedback on any instances where its feedback is incorrect or counter productive. You can react with 👍 and 👎 on @gemini-code-assist comments or fill out our survey to provide feedback.

You can also get AI-powered code generation, chat, as well as code reviews directly in the IDE at no cost with the Gemini Code Assist IDE Extension.

Footnotes

1. Review the Privacy Notices, Generative AI Prohibited Use Policy, Terms of Service, and learn how to configure Gemini Code Assist in GitHub here. Gemini can make mistakes, so double check it and use code with caution. ↩

[gemini-code-assist]

Code Review

This pull request introduces a new example for batch writing to an Iceberg table using the BigQuery Metastore. The changes are well-contained, adding the necessary dependency and the example code. My review includes suggestions to fix a Javadoc formatting issue that could break the build, remove a potentially confusing and outdated date from a comment, and refactor a complex lambda to improve code readability and maintainability.