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object CachedGpuBatchIterator

Provides a transition between a GpuDataProducer[Table] and an Iterator[ColumnarBatch]. Because of the disconnect in semantics between a GpuDataProducer and generally how we use an Iterator[ColumnarBatch] pointing to GPU data this will drain the producer, converting the data to columnar batches, and make them all spillable so the GpuSemaphore can be released in between each call to next. There is one special case, if there is only one table from the producer it will not be made spillable on the assumption that the semaphore is already held and will not be released before the first table is consumed. This is also fitting with the semantics of how we use an Iterator[ColumnarBatch] pointing to GPU data.

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  4. def apply(producer: GpuDataProducer[Table], dataTypes: Array[DataType]): GpuColumnarBatchIterator
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