HeartSaVioR commented on code in PR #40561:
URL: https://github.com/apache/spark/pull/40561#discussion_r2096770151
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sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/statefulOperators.scala:
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@@ -980,3 +1023,67 @@ object StreamingDeduplicateExec {
private val EMPTY_ROW =
UnsafeProjection.create(Array[DataType](NullType)).apply(InternalRow.apply(null))
}
+
+case class StreamingDeduplicateWithinWatermarkExec(
+ keyExpressions: Seq[Attribute],
+ child: SparkPlan,
+ stateInfo: Option[StatefulOperatorStateInfo] = None,
+ eventTimeWatermarkForLateEvents: Option[Long] = None,
+ eventTimeWatermarkForEviction: Option[Long] = None)
+ extends BaseStreamingDeduplicateExec {
+
+ protected val schemaForValueRow: StructType = StructType(
+ Array(StructField("expiresAtMicros", LongType, nullable = false)))
+
+ protected val extraOptionOnStateStore: Map[String, String] = Map.empty
+
+ private val eventTimeCol: Attribute =
WatermarkSupport.findEventTimeColumn(child.output,
+ allowMultipleEventTimeColumns = false).get
+ private val delayThresholdMs =
eventTimeCol.metadata.getLong(EventTimeWatermark.delayKey)
+ private val eventTimeColOrdinal: Int = child.output.indexOf(eventTimeCol)
+
+ protected def initializeReusedDupInfoRow(): Option[UnsafeRow] = {
+ val timeoutToUnsafeRow = UnsafeProjection.create(schemaForValueRow)
+ val timeoutRow = timeoutToUnsafeRow(new
SpecificInternalRow(schemaForValueRow))
+ Some(timeoutRow)
+ }
+
+ protected def putDupInfoIntoState(
+ store: StateStore,
+ data: UnsafeRow,
+ key: UnsafeRow,
+ reusedDupInfoRow: Option[UnsafeRow]): Unit = {
+ assert(reusedDupInfoRow.isDefined, "This should have reused row.")
+ val timeoutRow = reusedDupInfoRow.get
+
+ // We expect data type of event time column to be TimestampType or
TimestampNTZType which both
+ // are internally represented as Long.
+ val timestamp = data.getLong(eventTimeColOrdinal)
+ // The unit of timestamp in Spark is microseconds, convert the delay
threshold to micros.
+ val expiresAt = timestamp + DateTimeUtils.millisToMicros(delayThresholdMs)
Review Comment:
The major concern about semantic here is, I don't think there is a great way
to respect the semantic very strictly.
I'd rather get back to the rationale - why the necessity of this operator
comes up? We want to deduplicate "as many as possible", but also want to avoid
state to stay indefinitely. This way I think TTL is the right way to go - it's
just that I think expiredAt being updated per processing duplicated event would
be much easier to understand.
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