Github user lw-lin commented on a diff in the pull request:
https://github.com/apache/spark/pull/16547#discussion_r95527829
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/UnsupportedOperationChecker.scala
---
@@ -69,8 +69,8 @@ object UnsupportedOperationChecker {
// watermark a group is never "finished" so we would never output
anything.
if (watermarkAttributes.isEmpty) {
throwError(
- s"$outputMode output mode not supported when there are
streaming aggregations on " +
- s"streaming DataFrames/DataSets")(plan)
+ s"$outputMode output mode requires watermark to be speficied
when there are " +
+ s"streaming aggregations on streaming
DataFrames/DataSets")(plan)
--- End diff --
this is an easy fix, so I've also included it in this patch
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