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https://issues.apache.org/jira/browse/CALCITE-6272?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Caican Cai closed CALCITE-6272.
-------------------------------
Resolution: Not A Problem
> Improved LogicalPlan representation of distinct keyword
> -------------------------------------------------------
>
> Key: CALCITE-6272
> URL: https://issues.apache.org/jira/browse/CALCITE-6272
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.36.0
> Reporter: Caican Cai
> Priority: Minor
> Fix For: 1.37.0
>
>
> In the ToLogicalConvert test, the LogicalPlan parsed with or without the
> distinct keyword is the same. I think this is an improvement.
>
> {code:java}
> @Test void testdistnct() {
> // Equivalent SQL:
> // SELECT DISTINCT *
> // FROM emp
> final RelBuilder builder = builder();
> final RelNode rel =
> builder.scan("EMP")
> .distinct()
> .build();
> String expectedPhysical = ""
> + "EnumerableTableScan(table=[[scott, EMP]])\n";
> String expectedLogical = ""
> + "LogicalTableScan(table=[[scott, EMP]])\n";
> verify(rel, expectedPhysical, expectedLogical);
> }
> @Test void test() {
> // Equivalent SQL:
> // SELECT DISTINCT *
> // FROM emp
> final RelBuilder builder = builder();
> final RelNode rel =
> builder.scan("EMP")
> .build();
> String expectedPhysical = ""
> + "EnumerableTableScan(table=[[scott, EMP]])\n";
> String expectedLogical = ""
> + "LogicalTableScan(table=[[scott, EMP]])\n";
> verify(rel, expectedPhysical, expectedLogical);
> } {code}
> I think it can be improved to something like
> {code:java}
> Logical Project (DISTINCT)
> +- Logical Scan (Table: employees){code}
>
>
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