Add Select to schema docs (#13046)
diff --git a/website/www/site/content/en/documentation/programming-guide.md b/website/www/site/content/en/documentation/programming-guide.md
index be52a08..abd682e 100644
--- a/website/www/site/content/en/documentation/programming-guide.md
+++ b/website/www/site/content/en/documentation/programming-guide.md
@@ -2645,12 +2645,12 @@
{{< paragraph class="language-py" >}}
-**beam.Row**
+**beam.Row and Select**
{{< /paragraph >}}
{{< paragraph class="language-py" >}}
-It's also possible to create ad-hoc schema declarations with a simple lambda
-that returns instances of `beam.Row`:
+There are also methods for creating ad-hoc schema declarations. First, you can
+use a lambda that returns instances of `beam.Row`:
{{< /paragraph >}}
{{< highlight py >}}
@@ -2660,17 +2660,28 @@
{{< /highlight >}}
{{< paragraph class="language-py" >}}
-Note that this declaration doesn't include any specific information about the
-types of the `bank` and `purchase_amount` fields. Beam will attempt to infer
-type information, if it's unable to it will fall back to the generic type
+Sometimes it can be more concise to express the same logic with the
+[`Select`](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.core.html#apache_beam.transforms.core.Select) transform:
+{{< /paragraph >}}
+
+{{< highlight py >}}
+input_pc = ... # {"bank": ..., "purchase_amount": ...}
+output_pc = input_pc | beam.Select(bank=lambda item: item["bank"],
+ purchase_amount=lambda item: item["purchase_amount"])
+{{< /highlight >}}
+
+{{< paragraph class="language-py" >}}
+Note that these declaration don't include any specific information about the
+types of the `bank` and `purchase_amount` fields, so Beam will attempt to infer
+type information. If it's unable to it will fall back to the generic type
`Any`. Sometimes this is not ideal, you can use casts to make sure Beam
-correctly infers types with `beam.Row`:
+correctly infers types with `beam.Row` or with `Select`:
{{< /paragraph >}}
{{< highlight py >}}
input_pc = ... # {"bank": ..., "purchase_amount": ...}
output_pc = input_pc | beam.Map(lambda item: beam.Row(bank=str(item["bank"]),
- purchase_amount=float(item["purchase_amount"]))
+ purchase_amount=float(item["purchase_amount"])))
{{< /highlight >}}
