Chunk-aligned indexing #183
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TomNicholas
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Jul 11, 2024
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| marr = create_manifestarray(shape=(4,), chunks=(2,)) | ||
| marr[0:2] | ||
| marr[2:4] | ||
| marr[0:4] |
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Need to come back and improve these placeholder tests
TomNicholas
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Jul 11, 2024
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| if chunk_length == 1: | ||
| # alot of indexing is possible only in this case, because this is basically just a normal array along that axis | ||
| chunk_slice = array_slice | ||
| return chunk_slice |
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Kind of interesting to realise this. You can even do things like slice(None, None, -1) to reverse the array in this case.
TomNicholas
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Jul 11, 2024
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| def _array_slice_to_chunk_slice( | ||
| array_slice: slice, | ||
| arr_length: int, | ||
| chunk_length: int, | ||
| ) -> slice: | ||
| """ | ||
| Translate a slice into an array into a corresponding slice into the underlying chunk grid. |
TomNicholas
commented
Jul 11, 2024
| indexer_nd = indexer | ||
|
|
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| indexer = _possibly_expand_trailing_ellipsis(key, self.ndim) | ||
| # _validate_indexer(indexer) |
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(probably don't need this as separate function)
TomNicholas
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Allows you to subset
ManifestArrayobjects, as long as your indexer slice aligns with chunk boundaries.docs/releases.rstapi.rst