viirya commented on a change in pull request #30074:
URL: https://github.com/apache/spark/pull/30074#discussion_r506779602
##########
File path: docs/structured-streaming-programming-guide.md
##########
@@ -1763,7 +1763,9 @@ Here is the compatibility matrix.
<tr>
<td colspan="2" style="vertical-align: middle;">Queries with
<code>mapGroupsWithState</code></td>
<td style="vertical-align: middle;">Update</td>
- <td style="vertical-align: middle;"></td>
+ <td style="vertical-align: middle;">
+ Aggregations not allowed in a query with <code>mapGroupsWithState</code>.
+ </td>
Review comment:
`UnsupportedOperationChecker.scala`:
```scala
if (m.isMapGroupsWithState) { // check
mapGroupsWithState
// allowed only in update query output mode and without aggregation
if (aggsInQuery.nonEmpty) {
throwError(
"mapGroupsWithState is not supported with aggregation " +
"on a streaming DataFrame/Dataset")
} else if (outputMode != InternalOutputModes.Update) {
...
}
} ..
..
```
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