Szymon Acedański created CASSANDRA-14286:
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Summary: IndexOutOfBoundsException with SELECT JSON using IN and
ORDER BY
Key: CASSANDRA-14286
URL: https://issues.apache.org/jira/browse/CASSANDRA-14286
Project: Cassandra
Issue Type: Bug
Environment: Kubernetes cluster using cassandra:3.11.1 Docker image.
Reporter: Szymon Acedański
Attachments: orderbug-traceback.txt
When running the following code:
{code}
public class CassandraJsonOrderingBug {
public static void main(String[] args) {
Session session = CassandraFactory.getSession();
session.execute("CREATE TABLE thebug ( PRIMARY KEY (a, b), a INT, b
INT)");
try {
session.execute("INSERT INTO thebug (a, b) VALUES (20, 30)");
session.execute("INSERT INTO thebug (a, b) VALUES (100, 200)");
Statement statement = new SimpleStatement("SELECT JSON a, b FROM
thebug WHERE a IN (20, 100) ORDER BY b");
statement.setFetchSize(Integer.MAX_VALUE);
for (Row w: session.execute(statement)) {
System.out.println(w.toString());
}
} finally {
session.execute("DROP TABLE thebug");
}
}
}
{code}
The following exception is thrown server-side:
{noformat}
java.lang.IndexOutOfBoundsException: Index: 1, Size: 1
at java.util.Collections$SingletonList.get(Collections.java:4815)
~[na:1.8.0_151]
at
org.apache.cassandra.cql3.statements.SelectStatement$SingleColumnComparator.compare(SelectStatement.java:1297)
~[apache-cassandra-3.11.1.jar:3.11.1]
at
org.apache.cassandra.cql3.statements.SelectStatement$SingleColumnComparator.compare(SelectStatement.java:1284)
~[apache-cassandra-3.11.1.jar:3.11.1]
at java.util.TimSort.countRunAndMakeAscending(TimSort.java:355)
~[na:1.8.0_151]
at java.util.TimSort.sort(TimSort.java:220) ~[na:1.8.0_151]
at java.util.Arrays.sort(Arrays.java:1512) ~[na:1.8.0_151]
at java.util.ArrayList.sort(ArrayList.java:1460) ~[na:1.8.0_151]
at java.util.Collections.sort(Collections.java:175) ~[na:1.8.0_151]
{noformat}
(full traceback attached)
The accessed index is the index of the sorted column in the SELECT JSON fields
list.
Similarly, if the select clause is changed to
SELECT JSON b, a FROM thebug WHERE a IN (20, 100) ORDER BY b
then the query finishes, but the output is sorted incorrectly (by textual JSON
representation):
{noformat}
Row[{"b": 200, "a": 100}]
Row[{"b": 30, "a": 20}]
{noformat}
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