[jira] [Created] (FLINK-21592) RemoveSingleAggregateRule fails due to nullability mismatch

[Shang Yuanchun (Jira)]

Rui Li created FLINK-21592:
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             Summary: RemoveSingleAggregateRule fails due to nullability mismatch
                 Key: FLINK-21592
                 URL: https://issues.apache.org/jira/browse/FLINK-21592
             Project: Flink
          Issue Type: Bug
          Components: Table SQL / Planner
            Reporter: Rui Li
             Fix For: 1.13.0


The test case to reproduce the issue:
{code}
    @Test
    public void test() throws Exception {
        tableEnv.executeSql("create table foo(x int,y int)");
        tableEnv.executeSql("create table bar(i int,s string)");
        System.out.println(tableEnv.explainSql("select (select count(x)-1 from foo where foo.y=bar.i) from bar"));
    }
{code}



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