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t

com.nvidia.spark.rapids.window

GpuUnboundToUnboundWindowWithFixer

trait GpuUnboundToUnboundWindowWithFixer extends AnyRef

For many window operations the results in earlier rows depends on the results from the last or later rows. In many of these cases we chunk the data based off of the partition by groups and process the data at once. But this can lead to out of memory errors, or hitting the row limit on some columns. Doing two passes through the data where the first pass processes the data and a second pass fixes up the data can let us keep the data in the original batches and reduce total memory usage. But this requires that some of the batches be made spillable while we wait for the end of the partition by group.

Right now this is written to be specific to windows that are unbounded preceding to unbounded following, but it could be adapted to also work for current row to unbounded following, and possibly more situations.

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GpuBasicMax, GpuBasicMin, GpuCount, GpuFloatMax, GpuFloatMin, GpuMax, GpuMin
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  1. abstract def newUnboundedToUnboundedFixer: BatchedUnboundedToUnboundedWindowFixer

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