[jira] [Updated] (CALCITE-2675) ReduceExpressionRule may throw type validation error as it may fail to preserve nullability

["Jesus Camacho Rodriguez (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CALCITE-2675?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jesus Camacho Rodriguez updated CALCITE-2675:
---------------------------------------------
    Summary: ReduceExpressionRule may throw type validation error as it may fail to preserve nullability  (was: ReduceExpressionRule may leave behind altered types w.r.t nullability)

> ReduceExpressionRule may throw type validation error as it may fail to preserve nullability
> -------------------------------------------------------------------------------------------
>
>                 Key: CALCITE-2675
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2675
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: Zoltan Haindrich
>            Assignee: Zoltan Haindrich
>            Priority: Major
>
> If a simplification could happen after some [ReduceExpression rewrite|https://github.com/apache/calcite/blob/fcc8bf7f44f92efb3c9a1e1f51ffc1a09cab27b9/core/src/main/java/org/apache/calcite/rel/rules/ReduceExpressionsRule.java#L794]; the simplification result may have a slightly different type in nullability. 
> {code}
>   @Test public <T> void testReduceCaseNullabilityChange() throws Exception {
>     HepProgram program = new HepProgramBuilder()
>         .addRuleInstance(ReduceExpressionsRule.FILTER_INSTANCE)
>         .addRuleInstance(ReduceExpressionsRule.PROJECT_INSTANCE)
>         .build();
>     try (Hook.Closeable a = Hook.REL_BUILDER_SIMPLIFY.add(Hook.propertyJ(false))) {
>       checkPlanning(program,
>           "select case when empno = 1 then 1 when 1 IS NOT NULL then 2 else null end as qx "
>               + "from emp");
>     }
> {code}
> Exposed by CALCITE-1413 changes; I'm not sure if there is any other variations for which the same could happen.



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