[Backport release-1.12] [r] Connect re-indexer to blockwise iterator #2748
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Connect the re-indexer to the blockwise iterator, allowing reads to be re-indexed on-the-fly. This PR parallels #1792 and completes #2152 and #2637; in addition, provides new shorthand for `reindex_disable_on_axis`: - `TRUE`: disable re-indexing on all axes - `FALSE: re-index on all axes - `NA`: re-index only on major axis, disable re-indexing on all axes (default) `BlockwiseTableReadIter$concat()` and `BlockwiseSparseReadIter$concat()` are disabled when re-indexing is requested (paralleling Python) `BlockwiseSparseReadIter` now accepts `repr = "R"` or `repr = "C"` under certain circumstances: - axis 0 (`soma_dim_0`) must be re-indexed to allow `repr = "R"` - axis 1 (`soma_dim_1`) must be re-indexed to allow `repr = "C"` `repr` of `"T"` is allowed in all circumstances and continues to be the default Two new fields are available to blockwise iterators: - `$axes_to_reindex`: a vector of minor axes slated to be re-indexed - `$reindexable`: status indicator stating if _any_ axis (major or minor) is slated to be re-indexed resolves #2671
johnkerl
approved these changes
Jun 17, 2024
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Backport b85bf3e from #2742