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[To dev/1.3] Made the schemaRegionMap nonnull for SchemaEngine (#15775)
Description
As the title said. https://github.com/apache/iotdb/pull/15775
This PR has:
- [ ] been self-reviewed.
- [ ] concurrent read
- [ ] concurrent write
- [ ] concurrent read and write
- [ ] added documentation for new or modified features or behaviors.
- [ ] added Javadocs for most classes and all non-trivial methods.
- [ ] added or updated version, license, or notice information
- [ ] added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader.
- [ ] added unit tests or modified existing tests to cover new code paths, ensuring the threshold for code coverage.
- [ ] added integration tests.
- [ ] been tested in a test IoTDB cluster.