Use provided memory resource for allocating mixed join results. (#16153)

This PR fixes a few places where certain code paths for mixed joins are not using the user-provided memory resource.

Authors:
  - Bradley Dice (https://github.com/bdice)

Approvers:
  - Mark Harris (https://github.com/harrism)
  - David Wendt (https://github.com/davidwendt)

URL: #16153

cpp/src/join/mixed_join.cu

@@ -82,9 +82,7 @@ mixed_join(
       // Left and full joins all return all the row indices from
       // left with a corresponding NULL from the right.
       case join_kind::LEFT_JOIN:
-      case join_kind::FULL_JOIN:
-        return get_trivial_left_join_indices(
-          left_conditional, stream, rmm::mr::get_current_device_resource());
+      case join_kind::FULL_JOIN: return get_trivial_left_join_indices(left_conditional, stream, mr);
       // Inner joins return empty output because no matches can exist.
       case join_kind::INNER_JOIN:
         return std::pair(std::make_unique<rmm::device_uvector<size_type>>(0, stream, mr),
@@ -100,8 +98,7 @@ mixed_join(
                          std::make_unique<rmm::device_uvector<size_type>>(0, stream, mr));
       // Full joins need to return the trivial complement.
       case join_kind::FULL_JOIN: {
-        auto ret_flipped = get_trivial_left_join_indices(
-          right_conditional, stream, rmm::mr::get_current_device_resource());
+        auto ret_flipped = get_trivial_left_join_indices(right_conditional, stream, mr);
         return std::pair(std::move(ret_flipped.second), std::move(ret_flipped.first));
       }
       default: CUDF_FAIL("Invalid join kind."); break;

cpp/src/join/mixed_join_semi.cu

@@ -117,9 +117,7 @@ std::unique_ptr<rmm::device_uvector<size_type>> mixed_join_semi(
       // Anti and semi return all the row indices from left
       // with a corresponding NULL from the right.
       case join_kind::LEFT_ANTI_JOIN:
-        return get_trivial_left_join_indices(
-                 left_conditional, stream, rmm::mr::get_current_device_resource())
-          .first;
+        return get_trivial_left_join_indices(left_conditional, stream, mr).first;
       // Inner and left semi joins return empty output because no matches can exist.
       case join_kind::LEFT_SEMI_JOIN:
         return std::make_unique<rmm::device_uvector<size_type>>(0, stream, mr);