[SYSTEMDS-3862] SSB Benchmark Implementation #2280
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This patch refines the current union operation to an internal LOP operation. Currently, two subsequent operations -- rbind() and unique() are used to perform the union operation. We rewrite the operation with an internal LOP that uses a HashSet to compute the unique entries and returns them in a matrix. This improves the efficiency of the operation, as it avoids unique(). The order of the input entries is preserved in the output. Closes apache#2286.
This patch introduces a basic integration of the out-of-core backend. For reading, we use a dedicated reblock instruction which creates a queue of blocks, spawns a thread for reading and immediately returns. In addition, we extended the acquireRead functionality to collect such streams of blocks whenever an operations requires the full matrix. Based on these foundations, we can now add other OCC operations that directly work with the input stream of blocks and produce either results or created modified output streams.
The test failure of not finding the mtd-file did not show up in local tests, because locally we do not clean the test directories, and from development there were both Xmtd and X.mtd existing.
This patch introduces the out-of-core unary aggregate operations as an example of how to implement operations against the input stream of blocks.
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