[iceberg] support migrating iceberg table which had suffered schema evolution #5083
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tsreaper
approved these changes
Feb 27, 2025
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Purpose
Linked issue: close #xxx
In pr #4639 and #4878, we had supported migrating iceberg table managed by hadoop-catalog or hive-catalog to paimon. This pr aims to support migrating the iceberg table which had suffered once or several times schema evolution.
Paimon stores the schema-id in each DataFileMeta for reading data files which had suffered schema evolution, so we extract the schema-id used by each iceberg data file and record it in the corresponding paimon DataFileMeta, and this makes paimon can handle the schema evolution case.
Tests
IcebergMigrateTest#testDeleteColumn
IcebergMigrateTest#testRenameColumn
IcebergMigrateTest#testAddColumn
IcebergMigrateTest#testReorderColumn
IcebergMigrateTest#testUpdateColumn
IcebergMigrateTest#testMigrateWithRandomIcebergEvolution
API and Format
Documentation