Caideyipi opened a new pull request, #18406:
URL: https://github.com/apache/iotdb/pull/18406
## Description
The aligned memtable flush fix in f87c9c3e80c introduced active-column
mapping into the common path even when no measurement was deleted. Wide aligned
batches then pay for Integer column mappings and additional per-point branches
during encoding.
This change keeps the deleted-measurement encoding path unchanged and
dispatches to the pre-f87c9c3 tight loop only when the active schema is the
original schema. Flushing memtables are immutable, so the identity check is
stable throughout encoding.
Two focused unit tests verify that:
- flushes without deleted measurements skip column mapping;
- flushes with deleted measurements still use the existing mapped path.
## Tests
- mvn spotless:apply -pl iotdb-core/datanode
- mvn test -pl iotdb-core/datanode -Dtest=MemTableFlushTaskTest
- Tests run: 5, Failures: 0, Errors: 0, Skipped: 0
- The targeted IoTDBPipeReceiverAutoCreateDisabledIT method was attempted
locally, but the test cluster failed in setUp because ConfigNode did not become
reachable. The test body was not entered; the failure is unrelated to this
change.
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