[Tarantool-patches] [PATCH v3 0/9] Initial datetime support

[Timur Safin]

* Version #3 changes:

  - renamed `struct datetime_t` to `struct datetime`, and `struct 
    datetime_interval_t` to `struct datetime_interval`;
  - significantly reworked arguments checks in module api entries;
  - fixed datetime comparisons;
  - changed hints calculation to take into account fractional part;
  - provided more comments here and there;

NB! There are MacOSX problems due to GLIBC specific code used (as Vlad
    has already pointed out) - so additional patch, making it more 
    cross-compatible coming here soon...

* Version #2 changes:

  - fixed problem with overloaded '-' and '+' operations for datetime 
    arguments;
  - fixed messagepack serialization problems;
  - heavily documented MessagePack serialization schema in the code;
  - introduced working implementation of datetime hints for storage engines;
  - made interval related names be more consistent, renamed durations and period 
    to intervals, i.e. t_datetime_duration to datetime_interval_t, 
    duration_* to interval_*, period to interval;
  - properly implemented all reasonable cases of datetime+interval 
    arithmetic;
  - moved all initialization code to utils.c;
  - renamed core/mp_datetime.c to core/datetime.c because it makes more
    sense now;

* Version #1 - initial RFC series

In brief
--------
This patchset implements datetime lua support in box, with serialization 
to messagepack, yaml, json and lua mode. Also it contains storage 
engines' indices implementation for datetime type introduced.

* Current implementation is heavily influenced by Sci-Lua lua-time module
  https://github.com/stepelu/lua-time 
  e.g. you could find very similar approach for handling of operations
  with year or month long intervals (which should be handled differently than
  usual intervals of seconds, or days).

* But internally we actually use Christian Hanson' c-dt module
  https://github.com/chansen/c-dt 
  (though it has been modified slightly for cleaner integration
  into cmake build process)


Datetime Module API
-------------------

We used to have here draft documentation of datetime module api, but 
for a convenience it has been extracted to the discussion topic there - 
https://github.com/tarantool/tarantool/discussions/6244#discussioncomment-1043988

Messagepack serialization schema
--------------------------------

In short it looks like:
- now we introduce new MP_EXT extension type #4;
- we may save 1 required and 2 optional fields for datetime field;

In all gory details it's explained in MessagePack serialization schema depicted here:
https://github.com/tarantool/tarantool/discussions/6244#discussioncomment-1043990


https://github.com/tarantool/tarantool/issues/5941
https://github.com/tarantool/tarantool/issues/5946

https://github.com/tarantool/tarantool/tree/tsafin/gh-5941-datetime-v3

Timur Safin (9):
  build: add Christian Hansen c-dt to the build
  lua: built-in module datetime
  lua, datetime: datetime tests
  lua, datetime: display datetime
  box, datetime: messagepack support for datetime
  box, datetime: datetime comparison for indices
  lua, datetime: time intervals support
  datetime: changelog for datetime module
  lua, box, datetime: rename struct datetime_t

 .gitmodules                                   |    3 +
 CMakeLists.txt                                |    8 +
 .../gh-5941-datetime-type-support.md          |    4 +
 cmake/BuildCDT.cmake                          |    6 +
 src/CMakeLists.txt                            |    3 +
 src/box/field_def.c                           |   52 +-
 src/box/field_def.h                           |    4 +
 src/box/lua/serialize_lua.c                   |    7 +-
 src/box/memtx_space.c                         |    3 +-
 src/box/msgpack.c                             |    7 +-
 src/box/tuple_compare.cc                      |   76 ++
 src/box/vinyl.c                               |    3 +-
 src/exports.h                                 |   29 +
 src/lib/core/CMakeLists.txt                   |    4 +-
 src/lib/core/datetime.c                       |  250 ++++
 src/lib/core/datetime.h                       |  115 ++
 src/lib/core/mp_extension_types.h             |    1 +
 src/lib/mpstream/mpstream.c                   |   10 +
 src/lib/mpstream/mpstream.h                   |    3 +
 src/lua/datetime.lua                          | 1058 +++++++++++++++++
 src/lua/init.c                                |    4 +-
 src/lua/msgpack.c                             |   12 +
 src/lua/msgpackffi.lua                        |   18 +
 src/lua/serializer.c                          |    4 +
 src/lua/serializer.h                          |    2 +
 src/lua/utils.c                               |   28 +-
 src/lua/utils.h                               |   12 +
 test/app-tap/datetime.test.lua                |  367 ++++++
 test/engine/datetime.result                   |   77 ++
 test/engine/datetime.test.lua                 |   35 +
 test/unit/CMakeLists.txt                      |    2 +
 test/unit/datetime.c                          |  221 ++++
 test/unit/datetime.result                     |  358 ++++++
 third_party/c-dt                              |    1 +
 third_party/lua-cjson/lua_cjson.c             |    8 +
 third_party/lua-yaml/lyaml.cc                 |    6 +-
 36 files changed, 2776 insertions(+), 25 deletions(-)
 create mode 100644 changelogs/unreleased/gh-5941-datetime-type-support.md
 create mode 100644 cmake/BuildCDT.cmake
 create mode 100755 src/lib/core/datetime.c
 create mode 100644 src/lib/core/datetime.h
 create mode 100644 src/lua/datetime.lua
 create mode 100755 test/app-tap/datetime.test.lua
 create mode 100644 test/engine/datetime.result
 create mode 100644 test/engine/datetime.test.lua
 create mode 100644 test/unit/datetime.c
 create mode 100644 test/unit/datetime.result
 create mode 160000 third_party/c-dt

-- 
2.29.2