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https://issues.apache.org/jira/browse/CALCITE-6833?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17927362#comment-17927362
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suibianwanwan commented on CALCITE-6833:
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[~julianhyde] This seems to be a minor fix. If needed, maybe I can submit a PR
on your branch to avoid conflicts.
> JDBC adapter generates invalid table alias for semi-join in UNION
> -----------------------------------------------------------------
>
> Key: CALCITE-6833
> URL: https://issues.apache.org/jira/browse/CALCITE-6833
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Priority: Major
>
> Following CALCITE-5395, the test
> [RelToSqlConverterTest.testUnionUnderSemiJoinNode|https://github.com/apache/calcite/blob/2ddfb0eb00bd87b040e4ca743a7451034dd28f98/core/src/test/java/org/apache/calcite/rel/rel2sql/RelToSqlConverterTest.java#L1783],
> generates the following query, which is invalid.
> {code}
> SELECT "DEPTNO"
> FROM (SELECT *
> FROM (SELECT *
> FROM "scott"."EMP"
> UNION ALL
> SELECT *
> FROM "scott"."EMP")
> WHERE EXISTS (SELECT 1
> FROM "scott"."DEPT"
> WHERE "t"."DEPTNO" = "DEPT"."DEPTNO")) AS "t";
> {code}
> The query is invalid because the table alias "t" is used in a scope where it
> is not visible. I suspect that {{AS "t"}} should be at the end of line 7, not
> line 11.
> {{RelToSqlConverterTest}} correctly gives a validation error
> {noformat}
> From line 10, column 7 to line 10, column 9: Table 't' not found
> {noformat}
> Validation is only now enabled, during development of a fix for CALCITE-5529.
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