Polber commented on code in PR #30895:
URL: https://github.com/apache/beam/pull/30895#discussion_r1567565392
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website/www/site/content/en/documentation/sdks/yaml-udf.md:
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@@ -133,11 +184,26 @@ expressions are supported as well
another_col: "col2 + col3"
```
+keeping in mind that any fields not intended to be included in the output
should be added to the `drop` field.
+
+If one wanted to select a field that collides with a[reserved SQL
keyword](https://calcite.apache.org/docs/reference.html#keywords), the field(s)
must be surrounded inbackticks. For example, say the incoming PCollection has a
field "timestamp", one would have to write:
Review Comment:
Done.
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