Update join to use experimental row hasher and comparator

cpp/include/cudf/detail/join.hpp

@@ -36,8 +36,8 @@
 template <typename T>
 class default_allocator;
 
-namespace cudf::structs::detail {
-class flattened_table;
+namespace cudf::experimental::row::equality {
+class preprocessed_table;
 }
 
 namespace cudf {
@@ -77,9 +77,9 @@ struct hash_join {
   rmm::device_buffer const _composite_bitmask;  ///< Bitmask to denote whether a row is valid
   cudf::null_equality const _nulls_equal;       ///< whether to consider nulls as equal
   cudf::table_view _build;                      ///< input table to build the hash map
-  std::unique_ptr<cudf::structs::detail::flattened_table>
-    _flattened_build_table;  ///< flattened data structures for `_build`
-  map_type _hash_table;      ///< hash table built on `_build`
+  std::shared_ptr<cudf::experimental::row::equality::preprocessed_table>
+    _preprocessed_build;  ///< input table preprocssed for row operators
+  map_type _hash_table;   ///< hash table built on `_build`
 
  public:
   /**
@@ -152,21 +152,20 @@ struct hash_join {
    * i.e. if full join is specified as the join type then left join is called. Behavior
    * is undefined if the provided `output_size` is smaller than the actual output size.
    *
-   * @throw cudf::logic_error if build table is empty and `JoinKind == INNER_JOIN`.
-   *
-   * @tparam JoinKind The type of join to be performed.
+   * @throw cudf::logic_error if build table is empty and `join == INNER_JOIN`.
    *
    * @param probe_table Table of probe side columns to join.
+   * @param join The type of join to be performed.
    * @param output_size Optional value which allows users to specify the exact output size.
    * @param stream CUDA stream used for device memory operations and kernel launches.
    * @param mr Device memory resource used to allocate the returned vectors.
    *
    * @return Join output indices vector pair.
    */
-  template <cudf::detail::join_kind JoinKind>
   std::pair<std::unique_ptr<rmm::device_uvector<size_type>>,
             std::unique_ptr<rmm::device_uvector<size_type>>>
   probe_join_indices(cudf::table_view const& probe_table,
+                     join_kind join,
                      std::optional<std::size_t> output_size,
                      rmm::cuda_stream_view stream,
                      rmm::mr::device_memory_resource* mr) const;
@@ -179,10 +178,10 @@ struct hash_join {
    * @throw cudf::logic_error if the number of columns in build table and probe table do not match.
    * @throw cudf::logic_error if the column data types in build table and probe table do not match.
    */
-  template <cudf::detail::join_kind JoinKind>
   std::pair<std::unique_ptr<rmm::device_uvector<size_type>>,
             std::unique_ptr<rmm::device_uvector<size_type>>>
   compute_hash_join(cudf::table_view const& probe,
+                    join_kind join,
                     std::optional<std::size_t> output_size,
                     rmm::cuda_stream_view stream,
                     rmm::mr::device_memory_resource* mr) const;