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https://issues.apache.org/jira/browse/CALCITE-6744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17913150#comment-17913150
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suibianwanwan commented on CALCITE-6744:
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I've revised the title. How does this version look?
> RelMetadataQuery.getColumnOrigins should return null when column origin
> Includes correlation variables
> ------------------------------------------------------------------------------------------------------
>
> Key: CALCITE-6744
> URL: https://issues.apache.org/jira/browse/CALCITE-6744
> Project: Calcite
> Issue Type: Improvement
> Reporter: suibianwanwan
> Assignee: suibianwanwan
> Priority: Critical
> Labels: pull-request-available
>
> The Correlate is not currently supported when metadata gets the column
> origin.(RelMdColumnOrigins#getColumnOrigins)
> If a column is processed from a correlation variable, the correlation
> variable is ignored and the rest of the columns are returned.
> In fact, we should return null for cases that cannot be determined.
> {code:java}
> @Test void testColumnOriginsForCorrelate() {
> final String sql = "select (select max(dept.name || '_' || emp.ename)"
> + "from dept where emp.deptno = dept.deptno) from emp";
> final RelMetadataFixture fixture = sql(sql);
> final HepProgramBuilder programBuilder = HepProgram.builder();
> programBuilder.addRuleInstance(CoreRules.PROJECT_SUB_QUERY_TO_CORRELATE);
> final HepPlanner planner = new HepPlanner(programBuilder.build());
> planner.setRoot(fixture.toRel());
> final RelNode optimizedRel = planner.findBestExp();
> fixture.withRelTransform(a -> optimizedRel.getInput(0).getInput(1))
> .assertColumnOriginSingle("DEPT", "NAME", true);
> } {code}
> OptimizeRel：
> {code:java}
> LogicalProject(EXPR$0=[$9])
> LogicalCorrelate(correlation=[$cor1], joinType=[left], requiredColumns=[{1,
> 7}])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]])
> LogicalAggregate(group=[{}], EXPR$0=[MAX($0)])
> LogicalProject($f0=[||(||($1, '_'), $cor1.ENAME)])
> LogicalFilter(condition=[=($cor1.DEPTNO, $0)])
> LogicalTableScan(table=[[CATALOG, SALES, DEPT]]){code}
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