cql3: selection: drop selector_factories, selectables, and selectors

The whole class hierarchy is no longer used by anything and we can just
delete it.

configure.py

@@ -916,10 +916,7 @@ def find_headers(repodir, excluded_dirs):
                 'cql3/query_options.cc',
                 'cql3/user_types.cc',
                 'cql3/untyped_result_set.cc',
-                'cql3/selection/abstract_function_selector.cc',
-                'cql3/selection/simple_selector.cc',
                 'cql3/selection/selectable.cc',
-                'cql3/selection/selector_factories.cc',
                 'cql3/selection/selection.cc',
                 'cql3/selection/selector.cc',
                 'cql3/restrictions/statement_restrictions.cc',

cql3/CMakeLists.txt

@@ -98,10 +98,7 @@ target_sources(cql3
     query_options.cc
     user_types.cc
     untyped_result_set.cc
-    selection/abstract_function_selector.cc
-    selection/simple_selector.cc
     selection/selectable.cc
-    selection/selector_factories.cc
     selection/selection.cc
     selection/selector.cc
     restrictions/statement_restrictions.cc

cql3/Cql.g

@@ -16,7 +16,6 @@ options {
 }
 
 @parser::includes {
-#include "cql3/selection/writetime_or_ttl.hh"
 #include "cql3/statements/raw/parsed_statement.hh"
 #include "cql3/statements/raw/select_statement.hh"
 #include "cql3/statements/alter_keyspace_statement.hh"
@@ -67,8 +66,8 @@ options {
 #include "cql3/statements/index_target.hh"
 #include "cql3/statements/ks_prop_defs.hh"
 #include "cql3/selection/raw_selector.hh"
+#include "cql3/selection/selectable-expr.hh"
 #include "cql3/keyspace_element_name.hh"
-#include "cql3/selection/selectable_with_field_selection.hh"
 #include "cql3/constants.hh"
 #include "cql3/operation_impl.hh"
 #include "cql3/error_listener.hh"

cql3/functions/castas_fcts.cc

@@ -380,19 +380,5 @@ get_castas_fctn_as_cql3_function(data_type to_type, data_type from_type) {
     return make_castas_function(to_type, from_type, f);
 }
 
-shared_ptr<function> castas_functions::get(data_type to_type, const std::vector<shared_ptr<cql3::selection::selector>>& provided_args) {
-    if (provided_args.size() != 1) {
-        throw exceptions::invalid_request_exception("Invalid CAST expression");
-    }
-    auto from_type = provided_args[0]->get_type();
-    auto from_type_key = from_type;
-    if (from_type_key->is_reversed()) {
-        from_type_key = dynamic_cast<const reversed_type_impl&>(*from_type).underlying_type();
-    }
-
-    auto f = get_castas_fctn(to_type, from_type_key);
-    return make_castas_function(to_type, from_type, f);
-}
-
 }
 }

cql3/functions/castas_fcts.hh

@@ -18,7 +18,6 @@
 #include "exceptions/exceptions.hh"
 #include <seastar/core/print.hh>
 #include "cql3/cql3_type.hh"
-#include "cql3/selection/selector.hh"
 
 namespace cql3 {
 namespace functions {
@@ -32,10 +31,5 @@ using castas_fctn = data_value(*)(data_value);
 castas_fctn get_castas_fctn(data_type to_type, data_type from_type);
 ::shared_ptr<function> get_castas_fctn_as_cql3_function(data_type to_type, data_type from_type);
 
-class castas_functions {
-public:
-    static shared_ptr<function> get(data_type to_type, const std::vector<shared_ptr<cql3::selection::selector>>& provided_args);
-};
-
 }
 }