Github user jaceklaskowski commented on a diff in the pull request:
https://github.com/apache/spark/pull/13210#discussion_r63987667
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/UnsupportedOperationChecker.scala
---
@@ -55,10 +55,19 @@ object UnsupportedOperationChecker {
case _: InsertIntoTable =>
throwError("InsertIntoTable is not supported with streaming
DataFrames/Datasets")
- case Aggregate(_, _, child) if child.isStreaming && outputMode ==
Append =>
- throwError(
- "Aggregations are not supported on streaming
DataFrames/Datasets in " +
- "Append output mode. Consider changing output mode to
Update.")
+ case Aggregate(_, _, child) if child.isStreaming =>
+ if (outputMode == Append) {
+ throwError(
+ "Aggregations are not supported on streaming
DataFrames/Datasets in " +
+ "Append output mode. Consider changing output mode to
Update.")
+ }
+ val moreStreamingAggregates = child.find {
+ case Aggregate(_, _, grandchild) if grandchild.isStreaming =>
true
+ case _ => false
+ }
+ if (moreStreamingAggregates.nonEmpty) {
+ throwError("Multiple streaming aggregations are not supported
DataFrames/Datasets")
--- End diff --
"are not supported DataFrames/Datasets"? It appears as "in" or "for" might
be missing?
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