schema: Provide all-selecting partition slice

This patch introduces schema::full_slice(), which returns a
partition_slice selecting the full clustering range, as well as all
static and regular columns. No options aside from the default are
set in that partition_slice.

Signed-off-by: Duarte Nunes <duarte@scylladb.com>
Message-Id: <1507732800-9448-1-git-send-email-duarte@scylladb.com>

schema.cc

@@ -34,6 +34,7 @@
 #include <boost/range/algorithm.hpp>
 #include <boost/algorithm/cxx11/any_of.hpp>
 #include "view_info.hh"
+#include "partition_slice_builder.hh"
 
 constexpr int32_t schema::NAME_LENGTH;
 
@@ -240,6 +241,7 @@ void schema::rebuild() {
     }
 
     _v3_columns = v3_columns::from_v2_schema(*this);
+    _full_slice = make_shared(partition_slice_builder(*this).build());
 }
 
 const column_mapping& schema::get_column_mapping() const {

schema.hh

@@ -408,6 +408,10 @@ public:
     void apply_to(schema_builder&) const;
 };
 
+namespace query {
+class partition_slice;
+}
+
 /*
  * Effectively immutable.
  * Not safe to access across cores because of shared_ptr's.
@@ -481,6 +485,8 @@ private:
     lw_shared_ptr<compound_type<allow_prefixes::no>> _partition_key_type;
     lw_shared_ptr<compound_type<allow_prefixes::yes>> _clustering_key_type;
     column_mapping _column_mapping;
+    shared_ptr<query::partition_slice> _full_slice;
+
     friend class schema_builder;
 public:
     using row_column_ids_are_ordered_by_name = std::true_type;
@@ -713,6 +719,9 @@ public:
     bool is_view() const {
         return bool(_view_info);
     }
+    const query::partition_slice& full_slice() const {
+        return *_full_slice;
+    }
     // Returns all index names of this schema.
     std::vector<sstring> index_names() const;
     // Returns all indices of this schema.