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https://issues.apache.org/jira/browse/CASSANDRA-19404?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17818060#comment-17818060
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Ekaterina Dimitrova commented on CASSANDRA-19404:
-------------------------------------------------
I can see the same error when testing on the initial Vector search commit from
CASSANDRA-18715
> Unexpected NullPointerException in ANN+WHERE when adding rows in another
> partition
> ----------------------------------------------------------------------------------
>
> Key: CASSANDRA-19404
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19404
> Project: Cassandra
> Issue Type: Bug
> Components: Feature/Vector Search
> Reporter: Stefano Lottini
> Assignee: Ekaterina Dimitrova
> Priority: Normal
> Fix For: 5.0-rc
>
>
> * *Bug observed on the Docker image 5.0-beta1*
> * *Bug also observed on latest head of Cassandra repo (as of 2024-02-15)*
> * _*(working fine on vsearch branch of datastax/cassandra, commit hash
> 80c2f8b9ad5b89efee0645977a5ca53943717c0d)*_
> Summary: A query with _ann + where clause on a map + where clause on the
> partition key_ starts erroring once there are other partitions in the table.
> There are three SELECT statements in the repro minimal code below - the third
> is where the error is triggered.
> {code:java}
> // reproduced with Dockerized Cassandra 5.0-beta1 on 2024-02-15
> /////////
> // SCHEMA
> /////////
> CREATE TABLE ks.v_table (
> pk int,
> row_v vector<float, 2>,
> metadata map<text, text>,
> PRIMARY KEY (pk)
> );
> CREATE CUSTOM INDEX v_md
> ON ks.v_table (entries(metadata))
> USING 'StorageAttachedIndex';
> CREATE CUSTOM INDEX v_idx
> ON ks.v_table (row_v)
> USING 'StorageAttachedIndex';
> /////////////////////////////
> // SELECT WORKS (empty table)
> /////////////////////////////
> SELECT * FROM ks.v_table
> WHERE metadata['map_k'] = 'map_v'
> AND pk = 0
> ORDER BY row_v ANN OF [0.1, 0.2]
> LIMIT 4;
> //////////////
> // ADD ONE ROW
> //////////////
> INSERT INTO ks.v_table (pk, metadata, row_v)
> VALUES
> (0, {'map_k': 'map_v'}, [0.11, 0.19]);
> /////////////////////////////////////////////
> // SELECT WORKS (table has queried partition)
> /////////////////////////////////////////////
> SELECT * FROM ks.v_table
> WHERE metadata['map_k'] = 'map_v'
> AND pk = 0
> ORDER BY row_v ANN OF [0.1, 0.2]
> LIMIT 4;
> //////////////////////////////////
> // ADD ONE ROW (another partition)
> //////////////////////////////////
> INSERT INTO ks.v_table (pk, metadata, row_v)
> VALUES
> (10, {'map_k': 'map_v'}, [0.11, 0.19]);
> /////////////////////////////////////////////////
> // SELECT BREAKS (table gained another partition)
> /////////////////////////////////////////////////
> SELECT * FROM ks.v_table
> WHERE metadata['map_k'] = 'map_v'
> AND pk = 0
> ORDER BY row_v ANN OF [0.1, 0.2]
> LIMIT 4; {code}
> The error has this appearance in CQL Console:
> {code:java}
> ReadFailure: Error from server: code=1300 [Replica(s) failed to execute read]
> message="Operation failed - received 0 responses and 1 failures: UNKNOWN from
> /172.17.0.2:7000" info={'consistency': 'ONE', 'required_responses': 1,
> 'received_responses': 0, 'failures': 1, 'error_code_map': {'172.17.0.2':
> '0x0000'}} {code}
> And the Cassandra logs have this to say:
> {code:java}
> java.lang.NullPointerException: Cannot invoke
> "org.apache.cassandra.index.sai.iterators.KeyRangeIterator.skipTo(org.apache.cassandra.index.sai.utils.PrimaryKey)"
> because "this.nextIterator" is null {code}
>
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