Caideyipi opened a new pull request, #18575:
URL: https://github.com/apache/iotdb/pull/18575
## Description
### Named Pipe memory blocks
- Add an immutable name to every PipeMemoryBlock managed by
PipeMemoryManager.
- Propagate descriptive names through all Pipe memory allocation APIs and
call sites.
- Keep live zero-sized blocks visible until release, while using weak
references so diagnostics do not retain otherwise unreachable zero-sized blocks.
- Preserve one output row per block instance; blocks with the same name are
not aggregated.
### SHOW PIPE MEMORY and information_schema
- Add SHOW PIPE MEMORY in the table SQL dialect.
- Add information_schema.pipe_memory with:
- name STRING TAG
- memory_usage_in_bytes INT64 ATTRIBUTE
- Expose floating memory as an independent FloatingMemory block.
- Read the table from the local DataNode and require global system privilege.
### Tests
- Add parser and PipeMemoryManager unit coverage.
- Update IoTDBDatabaseIT for table discovery, schema, permissions,
SHOW/SELECT access, and system-table counts.
- Verified:
- mvn -o install -pl iotdb-core/node-commons,iotdb-core/relational-grammar
-DskipTests
- mvn -o test -pl iotdb-core/datanode
-Dtest=ShowPipeMemoryTest,PipeMemoryManagerResizeTest,LoadTsFileMemoryManagerTest
-Dcheckstyle.skip=true -Dspotless.check.skip=true
- mvn checkstyle:check -pl iotdb-core/datanode
- git diff --check
The integration test module could not be executed locally in offline mode
because several required snapshot artifacts were unavailable.
<hr>
This PR has:
- [x] been self-reviewed.
- [x] concurrent read and write
- [x] added comments explaining non-obvious lifecycle and accounting
behavior.
- [x] added unit tests or modified existing tests to cover new code paths.
- [x] added integration tests.
<hr>
##### Key changed/added classes
- PipeMemoryBlock
- PipeMemoryManager
- InformationSchema
- InformationSchemaContentSupplierFactory
- RelationalSql.g4
- AstBuilder
- IoTDBDatabaseIT
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