Add new example of not working code

Author: Mikolaj Komar

examples/mp/local_issue.cpp

@@ -30,9 +30,15 @@ int main(int argc, char **argv) {
     auto [n, ma] = ind;
     fmt::print("some res 2 {} {} {}\n", val, n, ma);
 
-    auto mapper = [] (auto elem) { auto [a, b] = elem; auto [c, d] = a; return d;};
-    auto summer = [](auto x, auto y) { return x + y;};
+    auto mapper = [] (auto elem) { auto [a, b] = elem; auto [c, d] = a; return c;};
     auto z2 = dr::transform_view(m_row, mapper);
+    for (auto x: local_segments(z2)) {
+      for (auto z : x)
+        {
+        fmt::print("some res {}\n", z);
+        }
+    }
+    auto summer = [](auto x, auto y) { return x + y;};
     auto red2 = dr::mp::reduce(z2, 0, summer);
     fmt::print("reduced row {} {}\n", red2, m_row.size());
   }

include/dr/mp/containers/matrix_formats/csr_row_distribution.hpp

@@ -335,18 +335,18 @@ class csr_row_distribution {
     std::size_t offset = row_size * rank;
     auto local_vals_range = rng::subrange(local_vals, local_vals + vals_size);
     auto local_cols_range = rng::subrange(local_cols, local_cols + vals_size);
-    // auto local_rows = rows_data->segments()[rank].begin().local();
+    auto local_rows = rows_data->segments()[rank].begin().local();
     auto zipped_results = rng::views::zip(local_vals_range, local_cols_range);
     auto enumerated_zipped = rng::views::enumerate(zipped_results);
     auto transformer = [=](auto entry){
       assert(offset == 0);
       auto [index, pair] = entry;
       auto [val, column] = pair;
-      auto row = 0;
-      // auto row = rng::distance(
-      //           local_rows,
-      //           std::upper_bound(local_rows, local_rows + row_size, offset_ + index) -
-      //               1);
+      // auto row = 0;
+      auto row = rng::distance(
+                local_rows,
+                std::upper_bound(local_rows, local_rows + row_size, offset + index) -
+                    1);
       dr::index<index_type> index_obj(row, column);
       value_type entry_obj(index_obj, val);
       return entry_obj;