Add Go example for schema-transform nested field access by MemonaAmirAbdulHaq · Pull Request #37543 · apache/beam

MemonaAmirAbdulHaq · 2026-02-07T19:29:22Z

Description:
This PR adds a Go example demonstrating how to access nested fields using the schema-transform feature in Apache Beam. It updates the documentation in programming-guide.md with a practical example for Go developers.
Changes included
- Added a Go code snippet showing nested field access.
- Improved explanations for clarity in the Go section of the schema-transform guide.
Why this is useful
- Helps Go developers understand and use nested schema transformations.
- Complements existing documentation with a working, practical example.

gemini-code-assist · 2026-02-07T19:29:36Z

Summary of Changes

Hello @MemonaAmirAbdulHaq, 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!

This pull request enhances the Apache Beam documentation for Go developers by providing a concrete example of how to utilize schema-transform features for nested field access. The update clarifies the process of working with schema-aware PCollections in Go, making the documentation more practical and up-to-date.

Highlights

Go Schema Example Added: Introduced a new Go code example demonstrating how to access nested fields within schema-aware PCollections, specifically extracting a post code from a nested shipping address struct.
Documentation Update: The programming-guide.md file has been updated to include this practical Go example, replacing a previous statement that indicated a lack of native Go support for Schema transforms.
Clarity Improvement: Enhanced the introductory explanation for Go developers on using schema-aware PCollections, guiding them on defining structs for schema inference and direct field access.

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Changelog

website/www/site/content/en/documentation/programming-guide.md
- Removed an outdated statement indicating that Beam did not yet support Schema transforms natively in Go.
- Added a Go code snippet demonstrating the definition of nested structs (ShippingAddress, Purchase) and the extraction of a nested field (PostCode) using beam.ParDo.
- Updated the descriptive text for Go's schema usage to explain how schemas are inferred from struct types and how to access fields directly in transforms.

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github-actions · 2026-02-07T20:43:15Z

Assigning reviewers:

R: @Abacn for label website.

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MemonaAmirAbdulHaq · 2026-02-09T21:08:44Z

Hi @Abacn Can you review it
Regards !!

MemonaAmirAbdulHaq · 2026-02-12T19:35:04Z

Hi @damccorm, please have a look at this PR, if you got some time, thanks.

damccorm · 2026-02-17T16:14:29Z

website/www/site/content/en/documentation/programming-guide.md


-A schema on a `PCollection` enables a rich variety of relational transforms. The fact that each record is composed of
-named fields allows for simple and readable aggregations that reference fields by name, similar to the aggregations in
-a SQL expression.


Why did you remove this?

damccorm · 2026-02-17T16:18:39Z

website/www/site/content/en/documentation/programming-guide.md

+postCodes := beam.ParDo(s, func(p Purchase) string {
+    return p.ShippingAddress.PostCode
+}, purchases)
+{{< /highlight >}}


Instead of dropping this into the top level section, we should follow the same pattern used by the other languages

damccorm · 2026-02-17T16:18:58Z

website/www/site/content/en/documentation/programming-guide.md

+    },
+ )
+postCodes := beam.ParDo(s, func(p Purchase) string {
+    return p.ShippingAddress.PostCode


This just shows how you can access fields of a Go object, it seems unrelated to schemas

Thanks for the feedback. I've restored the original schema description .

github-actions · 2026-02-25T12:27:36Z

Reminder, please take a look at this pr: @Abacn

github-actions · 2026-03-02T12:24:42Z

Assigning new set of reviewers because Pr has gone too long without review. If you would like to opt out of this review, comment assign to next reviewer:

R: @damccorm for label website.

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github-actions · 2026-03-09T12:25:56Z

Reminder, please take a look at this pr: @damccorm

github-actions · 2026-03-11T12:25:58Z

Assigning new set of reviewers because Pr has gone too long without review. If you would like to opt out of this review, comment assign to next reviewer:

R: @kennknowles for label website.

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kennknowles · 2026-03-11T14:12:16Z

R: @damccorm

github-actions · 2026-03-11T14:13:30Z

Stopping reviewer notifications for this pull request: review requested by someone other than the bot, ceding control. If you'd like to restart, comment assign set of reviewers

damccorm · 2026-03-19T19:35:58Z

website/www/site/content/en/documentation/programming-guide.md

+
 {{< paragraph class="language-go">}}
-Beam does not yet support Schema transforms natively in Go. However, it will be implemented with the following behavior.
+Support for Schema Transforms hasn't been developed for the Go SDK yet.


This currently just changes the wording, it does not address the issue

damccorm · 2026-03-19T19:36:19Z

waiting on author

Add Go example for schema-transform nested field access

c250bb0

github-actions bot added the website label Feb 7, 2026

github-actions bot added the Next Action: Reviewers label Feb 7, 2026

MemonaAmirAbdulHaq mentioned this pull request Feb 8, 2026

Beam Programming Guide: Add Go version of Section 6.6 "Using Schema Transforms" #21184

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damccorm reviewed Feb 17, 2026

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fix: restore deleted schema description and remove incorrect Go example

607903d

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damccorm reviewed Mar 19, 2026

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