Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/17361#discussion_r107304196
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/UnsupportedOperationChecker.scala
---
@@ -147,49 +147,68 @@ object UnsupportedOperationChecker {
throwError("Commands like CreateTable*, AlterTable*, Show* are
not supported with " +
"streaming DataFrames/Datasets")
- // mapGroupsWithState: Allowed only when no aggregation + Update
output mode
- case m: FlatMapGroupsWithState if m.isStreaming &&
m.isMapGroupsWithState =>
- if (collectStreamingAggregates(plan).isEmpty) {
- if (outputMode != InternalOutputModes.Update) {
- throwError("mapGroupsWithState is not supported with " +
- s"$outputMode output mode on a streaming
DataFrame/Dataset")
- } else {
- // Allowed when no aggregation + Update output mode
- }
- } else {
- throwError("mapGroupsWithState is not supported with
aggregation " +
- "on a streaming DataFrame/Dataset")
- }
-
- // flatMapGroupsWithState without aggregation
- case m: FlatMapGroupsWithState
- if m.isStreaming && collectStreamingAggregates(plan).isEmpty =>
- m.outputMode match {
- case InternalOutputModes.Update =>
- if (outputMode != InternalOutputModes.Update) {
- throwError("flatMapGroupsWithState in update mode is not
supported with " +
+ // mapGroupsWithState and flatMapGroupsWithState
+ case m: FlatMapGroupsWithState if m.isStreaming =>
--- End diff --
Wow, this is getting complicated...
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