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Posted to github@beam.apache.org by GitBox <gi...@apache.org> on 2022/04/20 18:14:55 UTC
[GitHub] [beam] TheNeuralBit opened a new pull request, #17413: [BEAM-14328] Tweaks to "Differences from pandas" page
TheNeuralBit opened a new pull request, #17413:
URL: https://github.com/apache/beam/pull/17413
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[GitHub] [beam] TheNeuralBit merged pull request #17413: [BEAM-14328] Tweaks to "Differences from pandas" page
Posted by GitBox <gi...@apache.org>.
TheNeuralBit merged PR #17413:
URL: https://github.com/apache/beam/pull/17413
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[GitHub] [beam] TheNeuralBit commented on a diff in pull request #17413: [BEAM-14328] Tweaks to "Differences from pandas" page
Posted by GitBox <gi...@apache.org>.
TheNeuralBit commented on code in PR #17413:
URL: https://github.com/apache/beam/pull/17413#discussion_r854517838
##########
website/www/site/content/en/documentation/dsls/dataframes/differences-from-pandas.md:
##########
@@ -51,20 +55,42 @@ Note that this collects the entire input dataset on a single node, so there’s
### Operations that produce non-deferred columns
+Examples:
+[`DeferredDataFrame.pivot`](https://beam.apache.org/releases/pydoc/current/apache_beam.dataframe.frames.html#apache_beam.dataframe.frames.DeferredDataFrame.pivot),
+[`DeferredDataFrame.transpose`](https://beam.apache.org/releases/pydoc/current/apache_beam.dataframe.frames.html#apache_beam.dataframe.frames.DeferredDataFrame.transpose),
+[`DeferredSeries.factorize`](https://beam.apache.org/releases/pydoc/current/apache_beam.dataframe.frames.html#apache_beam.dataframe.frames.DeferredSeries.factorize)
+
Beam DataFrame operations are deferred, but the schemas of the resulting DataFrames are not, meaning that result columns must be computable without access to the data. Some DataFrame operations can’t support this usage, so they can’t be implemented. These operations raise a [WontImplementError](https://beam.apache.org/releases/pydoc/{{< param release_latest >}}/apache_beam.dataframe.frame_base.html#apache_beam.dataframe.frame_base.WontImplementError).
+<!-- TODO(BEAM-12169): Document the use of categorical columns as a workaround -->
Review Comment:
FYI @yeandy I added this TODO here (since I was editing this page anyway). This would be a good place to document how categorical columns can be used as a workaround for some non-deferred-column operations.
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