Stamatis Zampetakis created CALCITE-4561:
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Summary: 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
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}}.
{noformat}
@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");
}
{noformat}
At the moment 'Sebastian' (with commission NULL) is wrongly included in the
result set.
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