[jira] [Created] (CALCITE-5468) SqlToRelConverter should register sub-queries inside ORDER BY clause for queries without aggregation

[Dmitry Sysolyatin (Jira)]

Dmitry Sysolyatin created CALCITE-5468:
------------------------------------------

             Summary: SqlToRelConverter should register sub-queries inside 
ORDER BY clause for queries without aggregation
                 Key: CALCITE-5468
                 URL: https://issues.apache.org/jira/browse/CALCITE-5468
             Project: Calcite
          Issue Type: Bug
          Components: core
    Affects Versions: 1.32.0
            Reporter: Dmitry Sysolyatin


At the moment the following query throws exception:
{code}
@Test void testOrderByWithSubQuery() {
    String sql = "SELECT empno\n"
        + "FROM emp\n"
        + "ORDER BY\n"
        + "CASE WHEN empno IN (1,2) THEN 0 ELSE 1 END";
    sql(sql).ok();
  }
{code}

{code}
while converting CASE WHEN `EMP`.`EMPNO` IN (1, 2) THEN 0 ELSE 1 END
java.lang.RuntimeException: while converting CASE WHEN `EMP`.`EMPNO` IN (1, 2) 
THEN 0 ELSE 1 END
        at 
org.apache.calcite.sql2rel.ReflectiveConvertletTable.lambda$registerNodeTypeMethod$1(ReflectiveConvertletTable.java:98)
{code}

It happens because SqlToRelConverter does not register sub-query inside ORDER 
BY if query does not have aggregation



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