[flink][cdc] Track schema event progress in CDC source reader#8311
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Signed-off-by: QuakeWang <wangfuzheng0814@foxmail.com>
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Purpose
The CDC source reader restored split progress only from data row
recordsToSkip. Schema change events can be emitted before any data rows are consumed, but that progress was not checkpointed independently. After recovery, the reader could emit the same schema change events again.This PR adds explicit schema event progress to
TableAwareFileStoreSourceSplitand tracks it with a CDC-specific split state. The split reader skips already emitted schema change events on restore, while preserving V1 checkpoint compatibility through a legacy progress marker.Tests
git diff --cached --checkmvn -pl paimon-flink/paimon-flink-cdc -am -DskipTests compilemvn -pl paimon-flink/paimon-flink-cdc -am -Pfast-build -DfailIfNoTests=false -Dtest=CDCCheckpointSerializerTest,CDCSourceEnumeratorTest,CDCSourceSplitReaderTest,CDCSourceTableManagerTest,TableAwareFileStoreSourceSplitSerializerTest,CDCSourceSplitStateTest test