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https://issues.apache.org/jira/browse/CALCITE-5127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17555602#comment-17555602
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Stamatis Zampetakis commented on CALCITE-5127:
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Thanks for summary [~libenchao] !
Regarding the decision to put correlation variables into {{LogicalFilter}} and
not {{Filter}} (respectively for {{LogicalProject}} and {{Project}}) it might
be true that it was an attempt to not propagate correlation variables to
physical nodes. However, many extensions of {{Filter}}, {{Project}}, etc., in
downstream projects are not really "physical" nodes but still "logical" with
few or none additional attributes.
Consider for instance, Apache Hive. The latter does not use at all the
{{LogicalXx}} expressions since it has its own {{HiveXx}} variants. If we only
add support for correlation variables in {{LogicalProject}} then how these
downstream projects will resolve problems like those mentioned here?
> 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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