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