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https://issues.apache.org/jira/browse/CALCITE-6368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17846371#comment-17846371
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James Duong commented on CALCITE-6368:
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[~cbrisson] , I tried this with 1.36 and 1.37 and got the query from the
comment above with the * instead of the COALESCE call.
What config are you using for your SqlValidatorImpl? Perhaps that's the
difference here.
Otherwise, have you been able to reproduce this with 1.37?
Thanks
> Inconsistent handling of COALESCE during validation
> ---------------------------------------------------
>
> Key: CALCITE-6368
> URL: https://issues.apache.org/jira/browse/CALCITE-6368
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.36.0
> Reporter: Claude Brisson
> Assignee: James Duong
> Priority: Major
>
> {{SqlCoalesceFunction}} has a {{rewriteCall()}} method which will replace the
> call with an {{SqlCase}} call during the unconditional rewrites stage.
> But expanding natural joins and {{USING}} conditions is done using
> {{COALESCE}} calls in a later validation stage.
> As a result, the following query:
> {code}
> WITH A AS (SELECT 1 AS X)
> SELECT
> COALESCE(A0.X, A1.X),
> *
> FROM A AS A0 NATURAL JOIN A AS A1
> {code}
> is transformed by the validation step into:
> {code}
> WITH `A` AS (SELECT 1 AS `X`)
> SELECT
> CASE WHEN `A0`.`X` IS NOT NULL THEN `A0`.`X` ELSE `A1`.`X` END,
> COALESCE(`A0`.`X`, `A1`.`X` AS `X0`) AS `X`
> FROM `A` AS `A0` NATURAL INNER JOIN `A` AS `A1`
> {code}
> Maybe, the expanded results of {{*}} with natural joins and of {{USING}}
> should pass through unconditional rewrites at creation.
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