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https://issues.apache.org/jira/browse/CASSANDRA-14286?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16430386#comment-16430386
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Francisco Fernandez commented on CASSANDRA-14286:
-------------------------------------------------
I've updated the trunk patch with the suggested approach, let me know if there
is something that should be changed. Thanks for the review.
> 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
> Components: CQL
> Environment: Kubernetes cluster using cassandra:3.11.1 Docker image.
> Reporter: Szymon Acedański
> Assignee: Francisco Fernandez
> Priority: Major
> 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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