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https://issues.apache.org/jira/browse/FLINK-27386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17527986#comment-17527986
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luoyuxia commented on FLINK-27386:
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[~tartarus] Thanks for reporting it. But what's the Flink version you use?
Would you like to post the stack strace?
When I test with flink master branch, although it'll still throw exception, but
it's assert exception.
> throw NPE if multi MAPJOIN hint union all
> -----------------------------------------
>
> Key: FLINK-27386
> URL: https://issues.apache.org/jira/browse/FLINK-27386
> Project: Flink
> Issue Type: Sub-task
> Components: Connectors / Hive
> Affects Versions: 1.13.1, 1.15.0
> Reporter: tartarus
> Priority: Major
>
> We can reproduce through a UT
> Add test case in HiveDialectITCase
> {code:java}
> @Test
> public void testHiveMultiMapJoinUnionAll() {
> tableEnv.executeSql("create table t1 (id bigint, name string)");
> tableEnv.executeSql("create table t2 (id bigint, name string)");
> tableEnv.executeSql("select /*+ mapjoin(t2) */ t1.id from t1 join t2 on
> t1.id = t2.id union all select /*+ mapjoin(t2) */ t1.id from t1 join t2 on
> t1.name = t2.name");
> } {code}
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