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https://issues.apache.org/jira/browse/CALCITE-7369?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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lincoln lee updated CALCITE-7369:
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Summary: ProjectToWindowRule loses column alias when optimizing OVER window
queries (was: ProjectToWindowRule loses column alias when optimizing nested
OVER window queries)
> ProjectToWindowRule loses column alias when optimizing OVER window queries
> --------------------------------------------------------------------------
>
> Key: CALCITE-7369
> URL: https://issues.apache.org/jira/browse/CALCITE-7369
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.41.0
> Reporter: lincoln lee
> Assignee: lincoln lee
> Priority: Major
>
> When compile a nested over window query, the optimized result lost some
> column alias
> Take the following case as an example:
> {code}
> @Test void testProjectToWindowRuleForNestedOver() {
> HepProgramBuilder builder = new HepProgramBuilder();
> builder.addRuleClass(ProjectToWindowRule.class);
> HepPlanner hepPlanner = new HepPlanner(builder.build());
> hepPlanner.addRule(CoreRules.PROJECT_TO_LOGICAL_PROJECT_AND_WINDOW);
> final String sql = "select deptno, f1, f2 from (select *,
> last_value(deptno) over (order by empno) f2\n"
> + "from (select *, first_value(deptno) over (order by empno) f1
> from emp))\n";
> sql(sql).withPlanner(hepPlanner)
> .check();
> }
> {code}
> the final output column alias 'F2' lost(became '$2'):
> {code}
> LogicalProject(DEPTNO=[$7], F1=[$9], $2=[$10])
> LogicalWindow(window#0=[window(order by [0] aggs [LAST_VALUE($7)])])
> LogicalWindow(window#0=[window(order by [0] aggs [FIRST_VALUE($7)])])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]])
> {code}
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