tvalentyn commented on code in PR #23224:
URL: https://github.com/apache/beam/pull/23224#discussion_r988335935
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website/www/site/content/en/documentation/programming-guide.md:
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@@ -4061,6 +4203,18 @@ purchases.apply(Group.byFieldNames("userId")
.aggregateField("costCents", Top.<Long>largestLongsFn(10),
"topPurchases"));
{{< /highlight >}}
+{{< highlight python >}}
+input_pc = ... # {"user_id": ...,"item_Id": ..., "cost_cents": ...}
+output_pc = input_pc | beam.GroupBy("user_id")
+ .aggregate_field("item_id",count,"num_purchases")
+ .aggregate_field("cost_cents",sum,"total_spendcents")
Review Comment:
there is
https://github.com/apache/beam/blob/master/sdks/python/apache_beam/transforms/combiners.py#L158
, but I am not sure what exactly is needed to 'expose' this CombineFn -
perhaps you could file a FR @TheNeuralBit ?
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