smeet07 commented on code in PR #23224:
URL: https://github.com/apache/beam/pull/23224#discussion_r984995002
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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:
So I can't use count directly? (other than defining the count function)
are there any other aggregate functions that can be used which need not be
defined? I guess we can use max/min here
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