Github user HeartSaVioR commented on a diff in the pull request:
https://github.com/apache/spark/pull/21733#discussion_r201848371
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala ---
@@ -825,6 +825,16 @@ object SQLConf {
.intConf
.createWithDefault(100)
+ val ADVANCED_REMOVE_REDUNDANT_IN_STATEFUL_AGGREGATION =
--- End diff --
And the default value of this is `false` so end users will be aware of
existence of this option, and have a chance to read the explanation before
setting this option to `true`.
We might elaborate a bit more on the config: tradeoff between reduced
memory usage vs possible perf. hit and suggest running this in non-production
before applying this to production. If we feel safer on elaborating more on
this, I'm happy to update it.
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