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https://issues.apache.org/jira/browse/CALCITE-3850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17060591#comment-17060591
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Danny Chen commented on CALCITE-3850:
-------------------------------------
I tried the query3 SQL in SqlToRelConverterTest and it succeed:
{code:java}
@Test public void testCaseInJoinCondition() {
final String sql = "select * from (select empno, ename, deptno from emp)
e\n"
+ "join (select * from dept) d\n"
+ "on (case when e.deptno=1 then e.deptno else e.deptno end) =
d.deptno\n"
+ "join (select * from dept) f\n"
+ "on (case when e.deptno=1 then e.deptno else e.deptno end) =
f.deptno";
sql(sql).ok();
}
{code}
> AssertionError when converts a SQL parse tree into a relational algebra
> expression
> ----------------------------------------------------------------------------------
>
> Key: CALCITE-3850
> URL: https://issues.apache.org/jira/browse/CALCITE-3850
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.21.0
> Reporter: fa zheng
> Priority: Major
>
> I execute following sql with calcite 1.21.0 in flink 1.10. When the two
> conditions of left outer join are like"ON t1.a=t2.a" and "ON t1.a=t3.a ", it
> execute successfully. However, when the two conditions of left outer join are
> like "ON IF(t1.a='...',CAST(RAND(123) AS STRING),t1.a)=t2.a" and "ON
> IF(t1.a='...',CAST(RAND(123) AS STRING),t1.a)=t3.a", it gets a assert error
> in method getRootField.
> It also can execute successfully with "ON t1.a=t2.a" and "ON
> IF(t1.a='...',CAST(RAND(123) AS STRING),t1.a)=t3.a".
> But failed with "ON IF(t1.a='...',CAST(RAND(123) AS STRING),t1.a)=t2.a" and
> "ON t1.a=t3.a"
> SELECT
> ...
> FROM
> (
> SELECT
> ...
> ) t1
> LEFT OUTER JOIN
> (
> SELECT
> ...
> ) t2
> ON ...
> LEFT OUTER JOIN
> (
> SELECT
> ...
> ) t3
> ON ...
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