ReneEnjilian opened a new pull request, #2005:
URL: https://github.com/apache/systemds/pull/2005
**Description:**
This pull request introduces a new iterator designed to enhance our sparse
block handling capabilities. Unlike the default IJV iterator, which iterates
over all non-zero cells, this iterator focuses on the indexes of non-zero
rows—skipping entirely zero rows. In a subsequent task, I will use this
iterator to investigate which improvements the DCSR representation can bring
over other representations like CSR in a number of key operations (e.g., matrix
multiplication, unary aggregates). The new iterator supports the all four
sparse formats: DCSR, MCSR, CSR, and COO. Testing has been added.
**Usage Example:**
```
SparseBlock block = ...; // Assume block is initialized
SparseBlockIteratorOverRows iter = block.getNonZeroRowIterator();
while (iter.hasNext()) {
int rowIndex = iter.next();
// Process non-zero row at rowIndex
}
```
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