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[spark] Fix restarted streaming query re-scanning full snapshot instead of resuming from checkpoint #8207

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[spark] Fix restarted streaming query re-scanning full snapshot instead of resuming from checkpoint #8207

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12 changes: 11 additions & 1 deletion ...-spark-common/src/main/scala/org/apache/paimon/spark/sources/PaimonMicroBatchStream.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -116,7 +116,17 @@ class PaimonMicroBatchStream(
override def planInputPartitions(start: Offset, end: Offset): Array[InputPartition] = {
val startOffset = {
val startOffset0 = PaimonSourceOffset(start)
if (startOffset0.compareTo(initOffset) < 0) {
// Fall back to initOffset only when the checkpointed snapshot has expired.
// initOffset is recomputed from the current table state on every (re)start,
// so with scan modes like latest-full it points at the current snapshot with
// scanSnapshot=true. Clamping a still-valid checkpointed offset up to it made
// a restarted query silently skip the changelog gap and re-scan the whole
// snapshot, re-emitting every row as +I.
if (startOffset0.snapshotId < table.snapshotManager().earliestSnapshotId()) {
logWarning(
s"Checkpointed start offset $startOffset0 is no longer available " +
s"(earliest snapshot: ${table.snapshotManager().earliestSnapshotId()}), " +
s"falling back to $initOffset.")
initOffset
} else {
startOffset0
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