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

["Igor Guzenko (Jira)" <ji...@apache.org>]

Igor Guzenko created CALCITE-3393:
-------------------------------------

             Summary: 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


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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