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fixed incorrect python wildcard example #37959

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Subramanya-Veeregowda wants to merge 3 commits into from
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fixed incorrect python wildcard example #37959

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e084b83
Add python wildcard example for field selection
Subramanya-Veeregowda Mar 26, 2026
864831d
Add python array example for field selection
Subramanya-Veeregowda Mar 26, 2026
8a68e27
Removed incorrect python wildcard example (not supported)
Subramanya-Veeregowda Mar 30, 2026
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24 changes: 18 additions & 6 deletions website/www/site/content/en/documentation/programming-guide.md
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Expand Up @@ -4229,6 +4229,15 @@ output_pc = input_pc | beam.Select(post_code=lambda item: str(item["shipping_add
Support for wildcards hasn't been developed for the Python SDK yet.
{{< /paragraph >}}

<< paragraph class="language-py" >>
Example of selecting all nested fields using wildcard:
<< /paragraph >>

<< highlight py >>
input_pc = ...
output_pc = input_pc | beam.Select("shippingAddress.*")
<< /highlight >>
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@damccorm damccorm Mar 30, 2026

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The snippet immediately above this says that "Support for wildcards hasn't been developed for the Python SDK yet." - have you tried this snippet out?

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@Subramanya-Veeregowda Subramanya-Veeregowda Mar 30, 2026

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Good catch, thanks for pointing this out.

You're right — since Python SDK doesn't support wildcards yet, this example may be incorrect. I’ll verify it locally and update or remove the snippet accordingly.

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@damccorm damccorm Mar 30, 2026

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Lets just close this PR since adding this example was the point of the PR.

Please manually verify changes before pushing them (don't just feed them into an AI tool)


{{< paragraph class="language-go">}}
Support for wildcards hasn't been developed for the Go SDK yet.
{{< /paragraph >}}
Expand All @@ -4242,12 +4251,6 @@ shipping-address fields one would write
purchases.apply(Select.fieldNames("shippingAddress.*"));
{{< /highlight >}}

<!--
{{< highlight py >}}
#TODO(https://github.com/apache/beam/issues/23275): Add support for projecting nested fields
input_pc = ... # {"user_id": ..., "shipping_address": "post_code": ..., "bank": ..., "purchase_amount": ...}
output_pc = input_pc | beam.Select("shipping_address.*"))
{{< /highlight >}} -->
##### **Arrays**

{{< paragraph class="language-java">}}
Expand All @@ -4259,6 +4262,15 @@ selected, the result is an array of the selected subfield type. For example
Support for Array fields hasn't been developed for the Python SDK yet.
{{< /paragraph >}}

{{< paragraph class="language-py" >}}
example of selecting a nested field inside an array:
{{< /paragraph >}}

<< highlight py >>
input_pc = ...
output_pc = input_pc | beam.Select("transactions[].bank")
<< /highlight py >>

{{< paragraph class="language-go">}}
Support for Array fields hasn't been developed for the Go SDK yet.
{{< /paragraph >}}
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