class KnnJoinIndexJudgement[T <: Geometry, U <: Geometry] extends JudgementBase[T, U] with FlatMapFunction2[Iterator[T], Iterator[U], Pair[T, U]] with Serializable
This class is responsible for performing a K-nearest neighbors (KNN) join operation using a spatial index. It extends the JudgementBase class and implements the FlatMapFunction2 interface.
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- KnnJoinIndexJudgement
- FlatMapFunction2
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Instance Constructors
- new KnnJoinIndexJudgement(k: Int, distanceMetric: DistanceMetric, includeTies: Boolean, broadcastQueryObjects: Broadcast[List[T]], broadcastObjectsTreeIndex: Broadcast[STRtree], buildCount: LongAccumulator, streamCount: LongAccumulator, resultCount: LongAccumulator, candidateCount: LongAccumulator)
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def
call(queryShapes: Iterator[T], objectShapes: Iterator[U]): Iterator[Pair[T, U]]
This method performs the KNN join operation.
This method performs the KNN join operation. It iterates over the geometries in the stream side and uses the spatial index to find the k nearest neighbors for each geometry. The method returns an iterator over the join results.
- queryShapes
iterator over the geometries in the query side
- objectShapes
iterator over the geometries in the object side
- returns
an iterator over the join results
- Definition Classes
- KnnJoinIndexJudgement → FlatMapFunction2
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- @Override()
- Exceptions thrown
Exceptionif the spatial index is not of type STRtree
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def
callUsingBroadcastObjectIndex(queryShapes: Iterator[T]): Iterator[Pair[T, U]]
This method performs the KNN join operation using the broadcast spatial index built using all geometries in the object side.
This method performs the KNN join operation using the broadcast spatial index built using all geometries in the object side.
- queryShapes
iterator over the geometries in the query side
- returns
an iterator over the join results
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def
callUsingBroadcastQueryList(objectShapes: Iterator[U]): Iterator[Pair[T, U]]
This method performs the KNN join operation using the broadcast query geometries.
This method performs the KNN join operation using the broadcast query geometries.
- objectShapes
iterator over the geometries in the object side
- returns
an iterator over the join results
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def
hasNextBase(buildShapes: List[_ <: Geometry], streamShapes: Iterator[_ <: Geometry]): Boolean
Iterator model for the nest loop join.
Iterator model for the nest loop join. It checks if there is a next match and populate it to the result.
- Attributes
- protected[joinJudgement]
- Definition Classes
- JudgementBase
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def
hasNextBase(spatialIndex: SpatialIndex, streamShapes: Iterator[_ <: Geometry], buildLeft: Boolean): Boolean
Iterator model for the index-based join.
Iterator model for the index-based join. It checks if there is a next match and populate it to the result.
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- protected[joinJudgement]
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- JudgementBase
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hashCode(): Int
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def
initPartition(): Unit
Looks up the extent of the current partition.
Looks up the extent of the current partition. If found,
matchmethod will activate the logic to avoid emitting duplicate join results from multiple partitions.Must be called before processing a partition. Must be called from the same instance that will be used to process the partition.
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- protected[joinJudgement]
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- JudgementBase
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isInstanceOf[T0]: Boolean
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def
log(message: String, params: <repeated...>[AnyRef]): Unit
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- protected[joinJudgement]
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- JudgementBase
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final
def
ne(arg0: AnyRef): Boolean
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def
nextBase(buildShapes: List[_ <: Geometry], streamShapes: Iterator[_ <: Geometry]): Pair[U, T]
Iterator model for the nest loop join.
Iterator model for the nest loop join. It returns 1 pair in the current batch. Each batch contains a list of pairs of geometries that satisfy the join condition. The current batch is the result of the current stream shape against all the build shapes.
- Attributes
- protected[joinJudgement]
- Definition Classes
- JudgementBase
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def
nextBase(spatialIndex: SpatialIndex, streamShapes: Iterator[_ <: Geometry], buildLeft: Boolean): Pair[U, T]
Iterator model for the index-based join.
Iterator model for the index-based join. It returns 1 pair in the current batch. Each batch contains a list of pairs of geometries that satisfy the join condition. The current batch is the result of the current stream shape against all the build shapes.
- Attributes
- protected[joinJudgement]
- Definition Classes
- JudgementBase
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