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https://issues.apache.org/jira/browse/CALCITE-6303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17916503#comment-17916503
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xiong duan commented on CALCITE-6303:
-------------------------------------
Fixed in
[28e0ab2|https://github.com/apache/calcite/commit/28e0ab23a32b70a8da27b7db472527d8265bcf43].
Thanks for the review [~zhehu] [~mbudiu] and [~caicancai] .
> UNION with CTE(s) results in exception during query validation
> --------------------------------------------------------------
>
> Key: CALCITE-6303
> URL: https://issues.apache.org/jira/browse/CALCITE-6303
> Project: Calcite
> Issue Type: Bug
> Affects Versions: 1.36.0
> Reporter: Austin Richardson
> Assignee: xiong duan
> Priority: Major
> Labels: pull-request-available
>
> Attempting to execute a query that includes a UNION with CTE(s) in one of its
> operands results in a ClassCastException during query validation.
>
> Example query:
>
> {code:java}
> ( SELECT 123 )
> UNION
> ( WITH t (col) AS (VALUES (456)) SELECT col FROM t ) {code}
>
> Snippet from resulting exception:
>
> {code:java}
> java.lang.ClassCastException: class org.apache.calcite.sql.SqlNodeList cannot
> be cast to class org.apache.calcite.sql.SqlCall
> at
> org.apache.calcite.sql.validate.SqlValidatorImpl.deduceModality(SqlValidatorImpl.java:4093){code}
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