gaoran10 commented on a change in pull request #9631:
URL: https://github.com/apache/pulsar/pull/9631#discussion_r580848095
##########
File path:
pulsar-sql/presto-pulsar/src/main/java/org/apache/pulsar/sql/presto/PulsarRecordCursor.java
##########
@@ -441,9 +442,11 @@ public boolean advanceNextPosition() {
//start time for deseralizing record
metricsTracker.start_RECORD_DESERIALIZE_TIME();
- SchemaInfo schemaInfo;
+ SchemaInfo schemaInfo =
getBytesSchemaInfo(pulsarSplit.getSchemaType(), pulsarSplit.getSchemaName());
Review comment:
This method may cause the exception `java.nio.BufferUnderflowException`.
```
private SchemaInfo loadSchema(BytesSchemaVersion bytesSchemaVersion) throws
PulsarAdminException {
ClassLoader originalContextLoader =
Thread.currentThread().getContextClassLoader();
try {
Thread.currentThread().setContextClassLoader(InjectionManagerFactory.class.getClassLoader());
return pulsarAdmin.schemas()
.getSchemaInfo(topicName.toString(),
ByteBuffer.wrap(bytesSchemaVersion.get()).getLong());
} finally {
Thread.currentThread().setContextClassLoader(originalContextLoader);
}
}
```
The schema version of `Schema.BYTES` is an empty bytes array. So
`ByteBuffer.wrap(bytesSchemaVersion.get()).getLong()` will cause the exception
`java.nio.BufferUnderflowException`.
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