[jira] [Commented] (CALCITE-2466) RexSimplify incorrectly simplify conjunction statement with null literal

["Julian Hyde (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-2466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16580119#comment-16580119 ] 

Julian Hyde commented on CALCITE-2466:
--------------------------------------

It seems correct that that query returns 0 rows. What do you think it should return?

> RexSimplify incorrectly simplify conjunction statement with null literal
> ------------------------------------------------------------------------
>
>                 Key: CALCITE-2466
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2466
>             Project: Calcite
>          Issue Type: Bug
>          Components: core
>            Reporter: Shuyi Chen
>            Assignee: Julian Hyde
>            Priority: Major
>             Fix For: 1.18.0
>
>
> This can be reproduced using the following test:
> {code:java}
>  @Test public void testFilterReduction() throws Exception {
>     HepProgramBuilder programBuilder = HepProgram.builder();
>     programBuilder.addRuleInstance(ReduceExpressionsRule.FILTER_INSTANCE);
>     HepPlanner planner = new HepPlanner(programBuilder.build());
>     final String sql = "select deptno from dept_nested where NAME <> '' AND employees <> null";
>     planner.setRoot(tester.convertSqlToRel(sql).rel);
>     RelNode bestRel = planner.findBestExp();
>     assertEquals(
>         "LogicalProject(DEPTNO=[$0])\n" +
>         "  LogicalFilter(condition=[AND(<>($1, ''), <>($3, null))])\n" +
>         "    LogicalTableScan(table=[[CATALOG, SALES, DEPT_NESTED]])\n",
>         RelOptUtil.toString(bestRel));
>   }
> {code}
> In this test, 
> {code:java}
> NAME <> '' AND employees <> null
> {code} is always evaluated to false incorrectly, so the optimized plan is 
> {code:java}
> LogicalProject(DEPTNO=[$0])
>   LogicalValues(tuples=[[]])
> {code}.



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