Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/19327#discussion_r141934283
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/UnsupportedOperationChecker.scala
---
@@ -233,16 +234,54 @@ object UnsupportedOperationChecker {
throwError("Full outer joins with streaming
DataFrames/Datasets are not supported")
}
- case LeftOuter | LeftSemi | LeftAnti =>
+ case LeftSemi | LeftAnti =>
if (right.isStreaming) {
- throwError("Left outer/semi/anti joins with a streaming
DataFrame/Dataset " +
- "on the right is not supported")
+ throwError("Left semi/anti joins with a streaming
DataFrame/Dataset " +
+ "on the right are not supported")
}
- case RightOuter =>
- if (left.isStreaming) {
- throwError("Right outer join with a streaming
DataFrame/Dataset on the left is " +
- "not supported")
+ // We support left and right outer streaming joins only in the
stream+stream case.
+ case LeftOuter | RightOuter =>
+ if (joinType == LeftOuter && !left.isStreaming &&
right.isStreaming) {
+ throwError("Left outer join with a streaming
DataFrame/Dataset " +
+ "on the right and non-streaming on the left is not
supported")
--- End diff --
... and a static DataFrame/Dataset on the left is not supported
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