Use the h5py low level API when reading dataset slices - #311
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The test failure here seems to be due to overlapping ranges being selected in the test that tries to write a spatial subset of a SOAP catalogue. Will need to investigate why that happens and what the result should be. |
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Relevant information if we do try to use hyperslab selections: https://forum.hdfgroup.org/t/quadratic-runtime-of-selecting-n-hyperslabs/12555 . |
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Instead of doing a separate read_direct() for each slice when cutting out a region, we can select all slices with H5Sselect_hyperslab() and then do a single H5Dread(). This might avoid some h5py overhead. See also #283.