QuakeWang opened a new pull request, #3414:
URL: https://github.com/apache/fluss/pull/3414
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### Purpose
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Lake filter pushdown state was kept on mutable lake source instances. If a
later pushdown had no convertible lake predicates, the old predicate could
remain active and incorrectly filter subsequent lake reads.
<!-- What is the purpose of the change -->
### Brief change log
<!-- Please describe the changes made in this pull request and explain how
they address the issue -->
- Reset Paimon and Iceberg lake filters on every `withFilters` call.
- Ensure Flink clears lake filters even when no lake predicates are
convertible.
- Recreate and replay lake pushdown state when copying `FlinkTableSource`,
avoiding shared mutable lake source state between copies.
- Add regression tests for Paimon, Iceberg, and Flink lake source copy
isolation.
### Tests
<!-- List UT and IT cases to verify this change -->
- `./mvnw -pl fluss-flink/fluss-flink-common -am
-Dtest='FlinkTableSourceFilterPushDownTest$LakeSourcePushDownTests'
-DfailIfNoTests=false -Dsurefire.failIfNoSpecifiedTests=false test`
- `./mvnw -pl
fluss-flink/fluss-flink-common,fluss-lake/fluss-lake-paimon,fluss-lake/fluss-lake-iceberg
-am
-Dtest=FlinkTableSourceFilterPushDownTest,PaimonLakeSourceTest,IcebergLakeSourceTest
-DfailIfNoTests=false -Dsurefire.failIfNoSpecifiedTests=false test`
### API and Format
<!-- Does this change affect API or storage format -->
### Documentation
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