[jira] [Resolved] (CALCITE-3393) RelStructuredTypeFlattener: improve support for functions with struct input

["Danny Chen (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CALCITE-3393?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Danny Chen resolved CALCITE-3393.
---------------------------------
    Fix Version/s: 1.22.0
       Resolution: Fixed

Fixed in [0d1d491|https://github.com/apache/calcite/commit/0d1d4915f6b2ce56a6d4b570d352432f1cb3fe1d], thanks for your PR [~IhorHuzenko] !

> RelStructuredTypeFlattener: improve support for functions with struct input
> ---------------------------------------------------------------------------
>
>                 Key: CALCITE-3393
>                 URL: https://issues.apache.org/jira/browse/CALCITE-3393
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>            Reporter: Igor Guzenko
>            Assignee: Igor Guzenko
>            Priority: Minor
>              Labels: pull-request-available
>             Fix For: 1.22.0
>
>          Time Spent: 1.5h
>  Remaining Estimate: 0h
>
> 1. [RelStructuredTypeFlattener|https://github.com/apache/calcite/blob/148bfd329413c0272395cc0b7c322b3c5a34b667/core/src/main/java/org/apache/calcite/sql2rel/RelStructuredTypeFlattener.java#L376] doesn't support aggregate functions for struct type column.
> Example test case:
> {code:java}
>   @Test
>   public void testAggregateFunctionWithStructInput() {
>     final String sql =
>         "select count(dn.skill) from sales.dept_nested dn";
>     sql(sql).ok();
>   }
> {code}
> 2. For other functions, except ITEM, flattener uses first nested primitive field from 
> original struct input. Example test case:
> {code:java}
>   @Test
>   public void testFunctionWithStructInput() {
>     final String sql =
>         "select json_type(dn.skill) from sales.dept_nested dn";
>     sql(sql).ok();
>   }
> {code}
> Generated plan:
> {code}
> LogicalProject(EXPR$0=[JSON_TYPE($2.TYPE)])
>   LogicalTableScan(table=[[CATALOG, SALES, DEPT_NESTED]])
> {code}



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