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https://issues.apache.org/jira/browse/CALCITE-5127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17558400#comment-17558400
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Stamatis Zampetakis commented on CALCITE-5127:
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For this PR let's focus on {{Project}} operator; we can discuss changes to
\{{Filter}} separately and when it becomes necessary.
I agree that we should update the javadoc of \{{RelNode#getVariablesSet}}; I
think I made a similar comment to the previous PR by Konstantin.
Rules should not drop correlation variables from Project silently; if we can
find an easy way to assert this somehow in the planner would be great but let's
treat this better in a follow-up JIRA. It might not be such of an issue after
all since as we discussed previously after \{{SubQueryRemoveRule}} we should
not have correlations in \{{Project}}.
In general, it is common practice to run \{{SubQueryRemoveRule}} at some
preprocessing step since rules in general do not currently apply inside a
subquery. If somebody works with a plan where subqueries are not expanded they
probably miss many interesting transformations.
> Error when executing query with subquery in select list that uses outer
> column of array type
> --------------------------------------------------------------------------------------------
>
> Key: CALCITE-5127
> URL: https://issues.apache.org/jira/browse/CALCITE-5127
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Dmitry Sysolyatin
> Assignee: Benchao Li
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.32.0
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> The following queries fail:
> {code}
> SELECT ARRAY(SELECT s.x) FROM (SELECT ARRAY[1,2,3] as x) s;
> SELECT ARRAY(SELECT * FROM UNNEST(s.x) y) FROM (SELECT ARRAY[1,2,3] as x) s;
> SELECT (SELECT CARDINALITY(s.x) LIMIT 1) FROM (SELECT ARRAY[1,2,3] as x) s;
>
> {code}
> With exception:
> {code}
> Caused by: java.lang.ClassCastException: java.lang.Integer cannot be cast to
> java.util.List
> {code}
> You can find test cases for this task in
> https://github.com/apache/calcite/commit/27e68ded2c3bea7d7af73dd1dc156e46fb3591a8
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