Support for timestamps

Signed-off-by: Julien Jerphanion <[email protected]>

include/sparrow/data_traits.hpp

@@ -18,6 +18,8 @@
 #include "fixed_size_layout.hpp"
 #include "variable_size_binary_layout.hpp"
 
+using time_point = std::chrono::zoned_time<std::chrono::system_clock>;
+
 namespace sparrow
 {
 
@@ -125,6 +127,12 @@ namespace sparrow
         using default_layout = variable_size_binary_layout<value_type, std::span<byte_t>, std::span<byte_t>>;  // FIXME: this is incorrect, change when we have the right types
     };
 
+    template <>
+    struct arrow_traits<time_point> : common_native_types_traits<time_point>
+    {
+        static constexpr data_type type_id = data_type::TIMESTAMP;
+    };
+
     namespace predicate
     {
 
@@ -147,4 +155,4 @@ namespace sparrow
         } constexpr has_arrow_traits;
     }
 
-}
+}

include/sparrow/data_type.hpp

@@ -19,6 +19,7 @@
 #include <optional>
 #include <string>
 #include <vector>
+#include <chrono>
 
 #include "sparrow/mp_utils.hpp"
 
@@ -82,14 +83,15 @@ namespace sparrow
         BINARY,
         // Fixed-size binary. Each value occupies the same number of bytes
         FIXED_SIZE_BINARY,
+        // Number of nanoseconds since the UNIX epoch with an optional timezone.
+        // See: https://arrow.apache.org/docs/python/timestamps.html#timestamps
+        TIMESTAMP,
     };
 
     /// C++ types value representation types matching Arrow types.
     // NOTE: this needs to be in sync-order with `data_type`
     using all_base_types_t = mpl::typelist<
-        std::nullopt_t  // REVIEW: not sure about if we need to have this one? for representing NA? is this
-                        // the right type?
-        ,
+        std::nullopt_t,
         bool,
         std::uint8_t,
         std::int8_t,
@@ -103,7 +105,8 @@ namespace sparrow
         float32_t,
         float64_t,
         std::string,
-        std::vector<byte_t>
+        std::vector<byte_t>,
+        std::chrono::time_point<std::chrono::system_clock>
         // TODO: add missing fundamental types here
         >;