Fix bug in depth calculation for list of struct columns

Signed-off-by: Yan Feng <[email protected]>

src/main/cpp/src/xxhash64.cu

@@ -515,8 +515,13 @@ void check_nested_depth(cudf::table_view const& input)
 
   column_checker_fn_t get_nested_depth = [&](cudf::column_view const& col) {
     if (col.type().id() == cudf::type_id::LIST) {
-      // list column will be replaced by its most inner non-list child
-      return get_nested_depth(cudf::lists_column_view(col).child());
+      auto const& child_col = cudf::lists_column_view(col).child();
+      // When encountering a List of Struct column, we need to account for an extra depth,
+      // as both the struct column and its elements will be pushed into the stack.
+      if (child_col.type().id() == cudf::type_id::STRUCT) {
+        return 1 + get_nested_depth(child_col);
+      }
+      return get_nested_depth(child_col);
     } else if (col.type().id() == cudf::type_id::STRUCT) {
       int max_child_depth = 0;
       for (auto child = col.child_begin(); child != col.child_end(); ++child) {