Ruben Q L created CALCITE-3828:
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Summary: MergeJoin throws NPE in case of null keys
Key: CALCITE-3828
URL: https://issues.apache.org/jira/browse/CALCITE-3828
Project: Calcite
Issue Type: Bug
Components: core
Affects Versions: 1.21.0
Reporter: Ruben Q L
Assignee: Ruben Q L
Problem can be reproduced with the following test (to be added to
EnumerablesTest.java):
{code}
@Test public void testMergeJoinWithNullKeys() {
assertThat(
EnumerableDefaults.mergeJoin(
Linq4j.asEnumerable(
Arrays.asList(
new Emp(30, "Fred"),
new Emp(20, "Sebastian"),
new Emp(30, "Theodore"),
new Emp(20, "Theodore"),
new Emp(40, null),
new Emp(30, null))),
Linq4j.asEnumerable(
Arrays.asList(
new Dept(15, "Marketing"),
new Dept(20, "Sales"),
new Dept(30, "Theodore"),
new Dept(40, null))),
e -> e.name,
d -> d.name,
(v0, v1) -> v0 + ", " + v1, false, false).toList().toString(),
equalTo("[Emp(30, Theodore), Dept(30, Theodore),"
+ " Emp(20, Theodore), Dept(30, Theodore)]"));
}
{code}
which throws a NPE inside EnumerableDefaults#MergeJoinEnumerator when trying to
compare null keys:
{code}
java.lang.NullPointerException
at java.lang.String.compareTo(String.java:1155)
at java.lang.String.compareTo(String.java:111)
at
org.apache.calcite.linq4j.EnumerableDefaults$MergeJoinEnumerator.advance(EnumerableDefaults.java:3861)
{code}
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