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https://issues.apache.org/jira/browse/CALCITE-7672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18099688#comment-18099688
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Yu Xu commented on CALCITE-7672:
--------------------------------
If there are no further issues, I will merge the relevant PR which had been
reviewed in coming days. https://github.com/apache/calcite/pull/5123
> PruneEmptyRules should support pruning empty Calc
> -------------------------------------------------
>
> 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 by PruneEmptyRules：
> {code:java}
> @Test void testEmptyCalc()
> {
> final String sql =
> "select z + x from (\n" + " select x + y as z, x from (\n" + " select * from
> (values (10, 1), (30, 3)) as t (x, y)\n" + " where x + y > 50))";
> sql(sql).withPreRule(CoreRules.FILTER_VALUES_MERGE,CoreRules.PROJECT_TO_CALC)
> .withRule(PruneEmptyRules.CALC_INSTANCE) .check();
> } {code}
> plan is:
> {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}
> should be pruned to
> {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[
> LogicalValues(tuples=[[]])
> ]]>
> </Resource>
> </TestCase> {code}
>
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