module Code_treejoin: sig .. end
val build_treejoin_code : Code_selection_context.code_selection_context ->
       Algebra_type.algop_expr ->
       Xquery_common_ast.axis * Xquery_algebra_ast.anode_test ->
       Algebra_type.alg_eval_code_dep *
       Code_selection_context.code_selection_context
val select_physical_op : Code_selection_context.code_selection_context ->
       Xquery_algebra_ast.input_signature ->
       Algebra_type.algop_expr ->
       Xquery_common_ast.axis * Xquery_algebra_ast.anode_test ->
       Xquery_physical_algebra_ast.physop_expr_name