[flink][cdc] Fix schema event position in source reader#8099
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Signed-off-by: QuakeWang <wangfuzheng0814@foxmail.com>
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Purpose
CDCSourceSplitReadergenerated schema change events per split, but re-added them every time a new data batch was attached to the pooled iterator. This could emit duplicate schema events for a multi-batch split.The same iterator also advanced
recordsToSkipfor both schema events and data events, while restore only skips underlying data rows. A checkpoint taken after schema events could therefore skip real data rows after recovery.Tests
mvn -pl paimon-flink/paimon-flink-cdc -Dtest=CDCSourceSplitReaderTest test