branch-4.0: [fix](multi-catalog) Preserve external partition metadata - #66010
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### What problem does this PR solve? Issue Number: None Related PR: apache#62821, apache#65583 Problem Summary: branch-4.0 only backported the Paimon side of the external partition metadata fixes. Hive-style scans, Hudi, Iceberg, and file load paths could still lose explicit NULL semantics or rely on physical file columns that are absent from migrated partitioned files. Iceberg also attached partition metadata only when runtime partition pruning was enabled and did not safely account for mixed transforms or partition evolution. This change adds common path partition parsing with aligned null flags, applies it to external scans and load paths, and sends stable Iceberg identity partition metadata for every split while respecting branch-4.0 scan-level slot constraints. ### Release note Fix partition-column materialization and NULL handling for Hive, Hudi, Iceberg, and file load paths on branch-4.0. ### Check List (For Author) - Test: Unit Test - ./run-fe-ut.sh --run org.apache.doris.datasource.FilePartitionUtilsTest,org.apache.doris.datasource.hive.source.HiveScanNodeTest,org.apache.doris.datasource.iceberg.IcebergUtilsTest,org.apache.doris.datasource.iceberg.source.IcebergScanNodeTest,org.apache.doris.datasource.paimon.source.PaimonScanNodeTest - Behavior changed: Yes. External partition metadata and NULL values are materialized consistently per split. - Does this need documentation: No
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What problem does this PR solve?
Issue Number: None
Related PR: #62821, #65583
Problem Summary: branch-4.0 only backported the Paimon side of the external partition metadata fixes. Hive-style scans, Hudi, Iceberg, and file load paths could still lose explicit NULL semantics or rely on physical file columns that are absent from migrated partitioned files. Iceberg also attached partition metadata only when runtime partition pruning was enabled and did not safely account for mixed transforms or partition evolution. This change adds common path partition parsing with aligned null flags, applies it to external scans and load paths, and sends stable Iceberg identity partition metadata for every split while respecting branch-4.0 scan-level slot constraints.
Release note
Fix partition-column materialization and NULL handling for Hive, Hudi, Iceberg, and file load paths on branch-4.0.
Check List (For Author)