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https://issues.apache.org/jira/browse/CALCITE-4719?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Hyde updated CALCITE-4719:
---------------------------------
Description:
Add variants of {{RexSubQuery}} that collect sub-queries into {{MULTISET}},
{{ARRAY}} and {{MAP}} collections. We currently use {{RexSubQuery}} for scalar
sub-query, {{EXISTS}}, {{IN}} and some others; this allows us to defer
conversion: convert via rewrites ({{RelOptRule}}) rather than in
{{SqlToRelConverter}}. The same benefits would apply to {{MULTISET}}, {{ARRAY}}
and {{MAP}} sub-queries.
Examples:
{code}
SELECT deptno, MULTISET(SELECT * FROM Emp WHERE deptno = d.deptno)
FROM Dept AS d
SELECT deptno, ARRAY(SELECT * FROM Emp WHERE deptno = d.deptno)
FROM Dept AS d
SELECT deptno, MAP(SELECT empno, job FROM Emp WHERE deptno = d.deptno)
FROM Dept AS d
{code}
> Add variants of RexSubQuery that collect sub-queries into MULTISET, ARRAY and
> MAP collections
> ---------------------------------------------------------------------------------------------
>
> Key: CALCITE-4719
> URL: https://issues.apache.org/jira/browse/CALCITE-4719
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: Julian Hyde
> Priority: Major
> Fix For: 1.28.0
>
>
> Add variants of {{RexSubQuery}} that collect sub-queries into {{MULTISET}},
> {{ARRAY}} and {{MAP}} collections. We currently use {{RexSubQuery}} for
> scalar sub-query, {{EXISTS}}, {{IN}} and some others; this allows us to defer
> conversion: convert via rewrites ({{RelOptRule}}) rather than in
> {{SqlToRelConverter}}. The same benefits would apply to {{MULTISET}},
> {{ARRAY}} and {{MAP}} sub-queries.
> Examples:
> {code}
> SELECT deptno, MULTISET(SELECT * FROM Emp WHERE deptno = d.deptno)
> FROM Dept AS d
> SELECT deptno, ARRAY(SELECT * FROM Emp WHERE deptno = d.deptno)
> FROM Dept AS d
> SELECT deptno, MAP(SELECT empno, job FROM Emp WHERE deptno = d.deptno)
> FROM Dept AS d
> {code}
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