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https://issues.apache.org/jira/browse/CALCITE-4561?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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xiong duan resolved CALCITE-4561.
---------------------------------
Fix Version/s: 1.39.0
Resolution: Fixed
> Wrong results for plan with EnumerableHashJoin (semi) on nullable colunms
> -------------------------------------------------------------------------
>
> Key: CALCITE-4561
> URL: https://issues.apache.org/jira/browse/CALCITE-4561
> Project: Calcite
> Issue Type: Bug
> Affects Versions: 1.27.0
> Reporter: Stamatis Zampetakis
> Assignee: xiong duan
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.39.0
>
>
> When the query plan contains an {{EnumerableHashJoin}} with type {{SEMI}}
> over nullable columns the results are wrong since the operator incorrectly
> considers {{NULL=NULL}} as {{TRUE}} instead of {{UNKNOWN}}/{{FALSE}}.
> The problem can be reproduced by putting the following test in
> {{EnumerableHashJoinTest}}.
> {code:java}
> @Test void semiJoinWithNulls() {
> tester(false, new JdbcTest.HrSchema())
> .query(
> "SELECT e1.name FROM emps e1 WHERE e1.commission in (SELECT
> e2.commission FROM emps e2)")
> .explainContains("EnumerableCalc(expr#0..1=[{inputs}], name=[$t0])\n"
> + " EnumerableHashJoin(condition=[=($1, $6)],
> joinType=[semi])\n"
> + " EnumerableCalc(expr#0..4=[{inputs}], name=[$t2],
> commission=[$t4])\n"
> + " EnumerableTableScan(table=[[s, emps]])\n"
> + " EnumerableTableScan(table=[[s, emps]])\n\n")
> .returnsUnordered(
> "name=Bill",
> "name=Eric",
> "name=Theodore");
> }
> {code}
> At the moment 'Sebastian' (with commission NULL) is wrongly included in the
> result set.
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