shanzi commented on code in PR #15884:
URL: https://github.com/apache/iceberg/pull/15884#discussion_r3134943935
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flink/v1.20/flink/src/main/java/org/apache/iceberg/flink/source/reader/WatermarkExtractorRecordEmitter.java:
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@@ -44,7 +44,10 @@ class WatermarkExtractorRecordEmitter<T> implements
SerializableRecordEmitter<T>
public void emitRecord(
RecordAndPosition<T> element, SourceOutput<T> output, IcebergSourceSplit
split) {
if (!split.splitId().equals(lastSplitId)) {
- long newWatermark = timeExtractor.extractWatermark(split);
+ long extracted = timeExtractor.extractWatermark(split);
+ // Subtract 1 because watermark W means all records with eventTime <= W
have arrived;
+ // records in this split have eventTime == extracted, so watermark must
be extracted - 1.
+ long newWatermark = extracted > Long.MIN_VALUE ? extracted - 1 :
Long.MIN_VALUE;
Review Comment:
This extracted value comes from the iceberg data, if there is a split whose
minimum value is `Long.MAX_VALUE`, it will become `Long.MAX_VALUE - 1`.
However, it is as expected because that `Long.MAX_VALUE` is a data record,
instead of a source terminates flag.
I believe when a source terminates, the `Long.MAX_VALUE` will not be emitted
though this way. It goes directly to subsequent operators.
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