[Bug] IndexOutOfBoundsException when lookup join sql

[Mrart]

Search before asking

• I searched in the issues and found nothing similar.

Paimon version

paimon 1.1.1 +flink 1.18
Basically, all the trigger conditions are met:

1. DEBUG logging was enabled for org.apache.paimon.flink.lookup.FileStoreLookupFunction in the production environment.
2. A lookup join is being used, and the table created is a SecondaryIndexLookupTable.
3. The join key is contract_no, which is not the complete primary key. The logs show _KEY_contract_no and _KEY_reg_valid, indicating that the full key also involves reg_valid.
4. There is a mismatch in the field order among the lookup projection, Paimon's internal read schema, and the original table schema.
5. The DEBUG branch attempts to print the matched rows, which leads to the execution of logRow().

LookupJoin[8] switched from RUNNING to FAILED

java.lang.RuntimeException: java.lang.IndexOutOfBoundsException
at org.apache.paimon.flink.lookup.FileStoreLookupFunction.lookup
...
Caused by: java.lang.IndexOutOfBoundsException
at org.apache.paimon.memory.MemorySegment.get
at org.apache.paimon.memory.MemorySegmentUtils.copyToBytes
at org.apache.paimon.data.BinaryString.toString
at org.apache.paimon.flink.lookup.FileStoreLookupFunction.logRow
at org.apache.paimon.flink.lookup.FileStoreLookupFunction.lambda$lookupInternal$4

Compute Engine

flink 1.18

Minimal reproduce step

1. DEBUG logging was enabled for org.apache.paimon.flink.lookup.FileStoreLookupFunction in the production environment.
2. A lookup join is being used, and the table created is a SecondaryIndexLookupTable.
3. The join key is contract_no, which is not the complete primary key. The logs show _KEY_contract_no and _KEY_reg_valid, indicating that the full key also involves reg_valid.
4. There is a mismatch in the field order among the lookup projection, Paimon's internal read schema, and the original table schema.
5. The DEBUG branch attempts to print the matched rows, which leads to the execution of logRow().

What doesn't meet your expectations?

none

Anything else?

No response

Are you willing to submit a PR?

• I'm willing to submit a PR!

[AmoghAtreya]

Hi, I would like to work on this.