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memoryError on dask.Dataset larger than ~500,000,000 points (32GB memory) #32

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@Simon-van-Diepen

When creating a Dask Dataset as space-time matrix, one index (int64) for each entry is always computed. On a 32GB machine this will cause a memory overflow for lazy, not-computed stms larger than ~500,000,000 points, yielding the error Stream closed.

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