bakjos opened a new pull request, #2622:
URL: https://github.com/apache/fluss/pull/2622
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### Purpose
Query performance for the data lake table is very slow compared to querying
remote storage. Add per-task lazy caching of Iceberg Catalog and Table inside
IcebergLakeSource so that createRecordReader reuses one loadTable for all lake
splits in a Flink source task, eliminating O(splits) REST round-trips when
using a REST catalog.
Before: N splits → N × (createCatalog + loadTable) → N REST calls per task.
After: N splits → 1 × (createCatalog + loadTable) on first split, then N-1
reuses → 1 REST loadTable per task. With TTL enabled, the cache is refreshed
after the TTL period so externally changed table metadata is picked up.
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Linked issue: close https://github.com/apache/fluss/issues/2619
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### Brief change log
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### Tests
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### API and Format
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### Documentation
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