suxiaogang223 opened a new pull request, #65712:
URL: https://github.com/apache/doris/pull/65712
### What problem does this PR solve?
Backport #61646 to `branch-4.1`.
Iceberg system tables on `branch-4.1` still use the legacy `iceberg_meta()`
/ `MetadataScanNode` path. This backport moves them to the native
`NativeSysTable -> FileQueryScanNode -> IcebergScanNode` execution path and
removes the obsolete TVF route.
### What changed?
- Cherry-picked the master landing commit `eea082b4540a`.
- Added `IcebergSysExternalTable` and native system-table planning,
authorization, and show-create handling.
- Routed Iceberg system-table splits through `FORMAT_JNI` with a single
serialized split.
- Removed `iceberg_meta()` and the legacy metadata-scan coverage.
- Adapted conflicts to `branch-4.1` while preserving its newer
FileScannerV2, LakeSoul, Paimon case handling, and JuiceFS behavior.
### Validation
- `DORIS_THIRDPARTY=<existing-thirdparty> ./build.sh --fe`
- `DORIS_THIRDPARTY=<existing-thirdparty> bash run-fe-ut.sh --run
org.apache.doris.datasource.systable.IcebergSysTableResolverTest,org.apache.doris.nereids.rules.analysis.UserAuthenticationTest`
- 10 tests, 0 failures, 0 errors
- `git diff origin/branch-4.1..HEAD --check`
BE compilation and external regression tests were not run locally.
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