Alieh Saeedi created KAFKA-20249:
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Summary: Optimize rawValue methods across all Deserializers
Key: KAFKA-20249
URL: https://issues.apache.org/jira/browse/KAFKA-20249
Project: Kafka
Issue Type: Sub-task
Reporter: Alieh Saeedi
Optimize rawValue/{{{}rawAggregationValue{}}} to fast-path the common case of
empty headers in headers-aware state stores, while preserving correct behavior
for non-empty headers.
h3. Background
In the current header-aware state store encoding, the value layout is:
* 1st byte: header-length prefix (or start of varint-encoded header size)
* Next {{N}} bytes: serialized headers
* Remaining bytes: aggregation value (payload)
Most state store records are expected to have no headers, so optimizing the
empty-headers case reduces overhead in hot paths where we need to extract the
raw aggregation value.
h3. Proposed Change
Introduce a specialized implementation of rawValue/{{{}rawAggregationValue{}}}:
```
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