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https://issues.apache.org/jira/browse/CALCITE-5247?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17585435#comment-17585435
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Ali Mansour commented on CALCITE-5247:
--------------------------------------
Hello [~libenchao]
SELECT
*
FROM
(
SELECT
A.C0 AS L,
B.C1 AS R1,
B.C2 AS R2
FROM
A
LEFT JOIN B
)
WHERE
(R1 IS NOT NULL)
OR (R2 IS NOT NULL)
should be transformed to
SELECT
A.C0 AS L,
B.C1 AS R1,
B.C2 AS R2
FROM
A
*INNER* JOIN B
> FilterJoinRule not simplifying a case that can be simplified
> ------------------------------------------------------------
>
> Key: CALCITE-5247
> URL: https://issues.apache.org/jira/browse/CALCITE-5247
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.25.0, 1.31.0
> Reporter: Ali Mansour
> Priority: Major
>
> In this specific case:
> Table A
> Table B
> FILTER(OR (IS NOT NULL(B.C0), IS NOT NULL(B.C1)))
> A LEFT JOIN B
> ->
> A INNER JOIN B
> The FilterJoinRule fails to simplify this specific case, however if we have
> only 1 IS_NOT_NULL in the filter condition, it is able to do so.
> I think the problem is in the Strong class.
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