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https://issues.apache.org/jira/browse/CALCITE-7672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18099348#comment-18099348
]
Zhen Chen commented on CALCITE-7672:
------------------------------------
Add the execution plan for this case without the current PR optimization.
{code:java}
<TestCase name="testEmptyCalc">
<Resource name="sql">
<![CDATA[select z + x from (
select x + y as z, x from (
select * from (values (10, 1), (30, 3)) as t (x, y)
where x + y > 50))]]>
</Resource>
<Resource name="planBefore">
<![CDATA[
LogicalProject(EXPR$0=[+(+($0, $1), $0)])
LogicalFilter(condition=[>(+($0, $1), 50)])
LogicalValues(tuples=[[{ 10, 1 }, { 30, 3 }]])
]]>
</Resource>
<Resource name="planAfter">
<![CDATA[
LogicalCalc(expr#0..1=[{inputs}], expr#2=[+($t0, $t1)], expr#3=[+($t2, $t0)],
EXPR$0=[$t3])
LogicalValues(tuples=[[]])
]]>
</Resource>
</TestCase> {code}
> Empty Calc should support be pruned
> -----------------------------------
>
> Key: CALCITE-7672
> URL: https://issues.apache.org/jira/browse/CALCITE-7672
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.42.0
> Reporter: Yu Xu
> Assignee: Yu Xu
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.43.0
>
>
> The empty CAL result in the current SQL cannot be pruned：
> {code:java}
> select z + x from (
> select x + y as z, x from (
> select * from (values (10, 1), (30, 3)) as t (x, y)
> where x + y > 50)) {code}
> plan is:
> {code:java}
> LogicalProject(EXPR$0=[+(+($0, $1), $0)]) LogicalFilter(condition=[>(+($0,
> $1), 50)]) LogicalValues(tuples=[[{ 10, 1 }, { 30, 3 }]]) {code}
> should be pruned to
> {code:java}
> LogicalValues(tuples=[[]]) {code}
>
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