lsyldliu commented on code in PR #21789:
URL: https://github.com/apache/flink/pull/21789#discussion_r1109568991
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docs/content/docs/connectors/table/hive/hive_functions.md:
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@@ -73,6 +73,35 @@ Some Hive built-in functions in older versions have [thread
safety issues](https
We recommend users patch their own Hive to fix them.
{{< /hint >}}
+## Use Native Hive Aggregate Functions
+
+If [HiveModule]({{< ref "docs/dev/table/modules" >}}#hivemodule) is loaded
with a higher priority than CoreModule, Flink will try to use the Hive built-in
function first. And then for Hive built-in aggregation function,
+Flink currently uses sort-based aggregation strategy. Compared to hash-based
aggregation strategy, the performance is worse, so from Flink 1.17, we have
implemented some of Hive's aggregation functions natively in Flink.
Review Comment:
当前只能使用sort agg运行，因此从1.17，我们引入了native hive agg functions, 其可以使用hash-agg策略运行，
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