patch thrust to fix intmax num elements limitation in scan_by_key (#8199

)

same fix seen here, but via patch: NVIDIA/thrust#1424

Also fixes rapidsai/cuspatial#393

Alternatively, we could wait and update our thrust version, rather than patching the existing one.

Authors:
  - Christopher Harris (https://github.com/cwharris)

Approvers:
  - Mark Harris (https://github.com/harrism)
  - Paul Taylor (https://github.com/trxcllnt)

URL: #8199

cpp/cmake/thrust.patch

@@ -42,3 +42,25 @@ index 1ffeef0..5e80800 100644
            for (int ITEM = 1; ITEM < ITEMS_PER_THREAD; ++ITEM)
            {
              if (ITEMS_PER_THREAD * tid + ITEM < num_remaining)
+diff --git a/thrust/system/cuda/detail/scan_by_key.h b/thrust/system/cuda/detail/scan_by_key.h
+index fe4b321c..b3974c69 100644
+--- a/thrust/system/cuda/detail/scan_by_key.h
++++ b/thrust/system/cuda/detail/scan_by_key.h
+@@ -513,7 +513,7 @@ namespace __scan_by_key {
+             scan_op(scan_op_)
+       {
+         int  tile_idx      = blockIdx.x;
+-        Size tile_base     = ITEMS_PER_TILE * tile_idx;
++        Size tile_base     = ITEMS_PER_TILE * static_cast<Size>(tile_idx);
+         Size num_remaining = num_items - tile_base;
+
+         if (num_remaining > ITEMS_PER_TILE)
+@@ -734,7 +734,7 @@ namespace __scan_by_key {
+                              ScanOp                     scan_op,
+                              AddInitToScan              add_init_to_scan)
+   {
+-    int          num_items    = static_cast<int>(thrust::distance(keys_first, keys_last));
++    size_t       num_items    = static_cast<size_t>(thrust::distance(keys_first, keys_last));
+     size_t       storage_size = 0;
+     cudaStream_t stream       = cuda_cub::stream(policy);
+     bool         debug_sync   = THRUST_DEBUG_SYNC_FLAG;