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https://issues.apache.org/jira/browse/FLINK-7922?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16227260#comment-16227260
]
ASF GitHub Bot commented on FLINK-7922:
---------------------------------------
Github user walterddr commented on a diff in the pull request:
https://github.com/apache/flink/pull/4929#discussion_r148083555
--- Diff:
flink-libraries/flink-table/src/test/scala/org/apache/flink/table/api/batch/sql/SetOperatorsTest.scala
---
@@ -178,4 +182,54 @@ class SetOperatorsTest extends TableTestBase {
expected
)
}
+
+ @Test
+ def testUnionNullableTypes(): Unit = {
--- End diff --
I think this should also be added to stream API as well but I am not sure
which test category it falls into.
> leastRestrictive in FlinkTypeFactory does not resolve composite type correctly
> ------------------------------------------------------------------------------
>
> Key: FLINK-7922
> URL: https://issues.apache.org/jira/browse/FLINK-7922
> Project: Flink
> Issue Type: Bug
> Components: Table API & SQL
> Affects Versions: 1.4.0
> Reporter: Rong Rong
> Assignee: Rong Rong
>
> FlinkTypeFactory does not override the following function correctly:
> {code:java}
> def leastRestrictive(types: util.List[RelDataType]): RelDataType = {
> //...
> }
> {code}
> dealing with SQL such as:
> {code:sql}
> CASE
> WHEN <CONDITION> THEN
> <COMPOSITE_TYPE>
> ELSE
> NULL
> END
> {code}
> will trigger runtime exception.
> See following test sample for more details:
> https://github.com/walterddr/flink/commit/a5f2affc9bbbd50f06200f099c90597e519e9170
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