Ulrich Kramer created CALCITE-6157:
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Summary: SqlValidatorImpl breaks join condition
Key: CALCITE-6157
URL: https://issues.apache.org/jira/browse/CALCITE-6157
Project: Calcite
Issue Type: Bug
Components: core
Affects Versions: 1.36.0
Reporter: Ulrich Kramer
When switching from 1.35.0 to 1.36.0, {{SqlValidatorImpl}} breaks the join
condition on the following statement
{code:SQL}
WITH `it1` AS (
SELECT
`company`,
`area`,
`revenue`,
`regionId`
FROM
`12345678-1234-1234-1234-000100000001`.`revenues`
)
SELECT
*
FROM
(
SELECT
`T1`.`company` AS `company`,
MAX(`T1`.`revenue`) AS `revenue`
FROM
`it1` AS `T1`
GROUP BY
`company`
) AS `T`
LEFT JOIN `it1` AS `T2` ON `T`.`company` = `T2`.`company`
AND `T`.`revenue` = `T2`.`revenue`
{code}
It modifies the join condition [at this
location|https://github.com/apache/calcite/blob/d3ab0bc8e4d4c9ebc0fc4e33ce478d276f5d11e4/core/src/main/java/org/apache/calcite/sql/validate/SqlValidatorImpl.java#L3603-L3604]
to
{code:SQL}
`T`.`company` = `T1`.`company`
AND `T`.`revenue` = `T1`.`revenue`
{code}
which causes a {{Table `T1`not found}}.
I already tried to reproduce the problem by adding the following test to
{{SqlValidatorTest}}, but everything worked fine
{code:java}
@Test void testWith2() {
sql("with it1 as (select empno, sal, deptno from emp)\n"
+ "select * from ( select t1.empno as empno, max(t1.deptno) as deptno
from it1 as t1 group by empno) as t\n"
+ "left outer join it1 as t2 on t.empno = t2.empno and t.deptno =
t2.deptno")
.ok();
}
{code}
During debugging, I recognized that the {{DelegatingScope}} does something
different in our case [at this
location|https://github.com/apache/calcite/blob/d3ab0bc8e4d4c9ebc0fc4e33ce478d276f5d11e4/core/src/main/java/org/apache/calcite/sql/validate/DelegatingScope.java#L333-L337].
In our case the {{fromNs}} resolved to {{`it1` AS `T1`}}, which is wrong.
But I was not able to find the root cause yet.
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