Github user brkyvz commented on a diff in the pull request:
https://github.com/apache/spark/pull/16520#discussion_r95479817
--- Diff:
sql/catalyst/src/main/java/org/apache/spark/sql/streaming/OutputMode.java ---
@@ -57,7 +57,8 @@ public static OutputMode Complete() {
/**
* OutputMode in which only the rows that were updated in the streaming
DataFrame/Dataset will
- * be written to the sink every time there are some updates.
+ * be written to the sink every time there are some updates. If the
query doesn't contain
+ * aggregations, it will be equivalent to the `Append` mode.
--- End diff --
ditto
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