Yu Xu created CALCITE-7672:
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Summary: 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
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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