damccorm commented on code in PR #37961:
URL: https://github.com/apache/beam/pull/37961#discussion_r3010446463
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website/www/site/content/en/documentation/programming-guide.md:
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@@ -4287,6 +4305,15 @@ arrays, the use of {} curly brackets in the selector is
recommended, to make it
selected, they can be omitted for brevity. In the future, map key selectors
will be supported, allowing selection of
specific keys from the map. For example, given the following schema:
+<< paragraph class="language-py" >>
+Example of selecting a specific key from a map field:
+<< /paragraph >>
+
+<< highlight py >>
+input_pc = ...
+output_pc = input_pc | beam.Select("purchasesByType['electronics']")
+<< /highlight >>
+
Review Comment:
This has the same problem as https://github.com/apache/beam/pull/37959 -
none of these are supported today
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