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https://issues.apache.org/jira/browse/CALCITE-1586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15830966#comment-15830966
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Zhiqiang He commented on CALCITE-1586:
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It was parse (A union B) union C befor Opimizer.
but after UnionMergeRule optimizer rule executed. the rel expression was
changed to A union B union C.
> wrong rel-to-sql conversion when performing set operation more then two
> inputs.
> -------------------------------------------------------------------------------
>
> Key: CALCITE-1586
> URL: https://issues.apache.org/jira/browse/CALCITE-1586
> Project: Calcite
> Issue Type: Bug
> Components: jdbc-adapter
> Affects Versions: 1.10.0
> Environment: NA
> Reporter: Zhiqiang He
> Assignee: Julian Hyde
> Priority: Critical
> Fix For: 1.12.0
>
>
> in union example, after UnionMergeRule, the union input is convert to three
> input, and rel to sql convert result is wrong.
> inputsql
> {code:sql}
> SELECT *
> FROM (SELECT \"product_id\"
> FROM \"foodmart\".\"product\"
> UNION ALL
> SELECT \"product_id\"
> FROM \"foodmart\".\"sales_fact_1997\")
> UNION ALL
> SELECT \"product_class_id\" AS \"PRODUCT_ID\"
> FROM \"foodmart\".\"product_class\"
> {code}
> output sql
> {code:sql}
> SELECT \"product_id\"
> FROM \"foodmart\".\"product\"
> UNION ALL
> SELECT \"product_id\"
> FROM \"foodmart\".\"sales_fact_199
> {code}
> the lastest union query is lost.
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