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https://issues.apache.org/jira/browse/CALCITE-6007?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17767311#comment-17767311
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Julian Hyde commented on CALCITE-6007:
--------------------------------------
What happens with the example query I gave above?
> CTE as subquery without alias doesn't have correct alias setup
> --------------------------------------------------------------
>
> Key: CALCITE-6007
> URL: https://issues.apache.org/jira/browse/CALCITE-6007
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.34.0, 1.35.0
> Reporter: Wenrui Meng
> Priority: Major
>
> {code:java}
> SELECT
> a,
> b
> FROM (
> WITH
> sub AS (
> SELECT
> 1 AS a,
> 2 AS b)
> SELECT
> *
> FROM
> sub)
> WHERE
> a IS NOT null
> {code}
> It will generate the following SQL statement after validation
> {code:java}
> SELECT
> EXPR$0.a,
> EXPR$0.b
> FROM (
> WITH
> sub AS (
> SELECT
> 1 AS a,
> 2 AS b)
> SELECT
> sub.a AS a, sub.b AS b
> FROM
> sub)
> WHERE
> EXPR$0.a IS NOT null
> {code}
> The validated SQL become invalid since there is no EXPR$0 alias append for
> the SqlWith sub query but used in the expression outside.
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