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https://issues.apache.org/jira/browse/CALCITE-7395?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zhen Chen resolved CALCITE-7395.
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Fix Version/s: 1.42.0
Assignee: Zhen Chen
Resolution: Fixed
Fixed in
[{{c251de4}}|https://github.com/apache/calcite/commit/c251de4eca57bc7fe60a27cd2cdb6a776fad8c1c]
Thanks for review [~dmsysolyatin]
> ProjectMergeRule incorrectly merges PROJECTs with correlation variables
> -----------------------------------------------------------------------
>
> Key: CALCITE-7395
> URL: https://issues.apache.org/jira/browse/CALCITE-7395
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.41.0
> Reporter: Zhen Chen
> Assignee: Zhen Chen
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.42.0
>
>
> The ProjectMergeRule cannot merge projects with correlation variables.
> This is SQL:
> {code:java}
> SELECT ARRAY(SELECT y + 1 FROM UNNEST(s.x) y)
> FROM (SELECT ARRAY[1,2,3] as x) s {code}
> The correct plan is following after processing with ProjectMergeRule:
> {code:java}
> LogicalProject(variablesSet=[[$cor0]], EXPR$0=[ARRAY({
> LogicalProject(EXPR$0=[+($0, 1)])
> Uncollect
> LogicalProject(X=[$cor0.X])
> LogicalValues(tuples=[[{ 0 }]])
> })])
> LogicalProject(X=[ARRAY(1, 2, 3)])
> LogicalValues(tuples=[[{ 0 }]]) {code}
> But current plan is:
> {code:java}
> LogicalProject(EXPR$0=[ARRAY({
> LogicalProject(EXPR$0=[+($0, 1)])
> Uncollect
> LogicalProject(X=[$cor0.X])
> LogicalValues(tuples=[[{ 0 }]])
> })])
> LogicalValues(tuples=[[{ 0 }]]) {code}
>
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