[PATCH v2 0/6] Merger

[Alexander Turenko]

There was made many changes since the previous iteration. Consider the
email in the mailing thread re the first version, where I answer to the
review comments. In short (non-exhaustive list of changes):

* move to box/;
* renames structures;
* change API: merger.pairs(ctx, ...);
* remove decode/encode, added net.box/msgpack helpers;
* removed say_debug() debug prints;
* replaced switched around different sources with virtual functions;
* deduplicated the code was copied from lbox_tuple_new();
* moved key_def creation to box/lua/key_def.[ch];

https://github.com/tarantool/tarantool/issues/3276
https://github.com/tarantool/tarantool/tree/Totktonada/gh-3276-on-board-merger

Alexander Turenko (6):
  Add luaL_iscallable with support of cdata metatype
  Add functions to ease using Lua iterators from C
  lua: add luaT_newtuple()
  lua: add luaT_new_key_def()
  net.box: add helpers to decode msgpack headers
  Add merger for tuple streams

 extra/exports                    |    2 +
 src/CMakeLists.txt               |    1 +
 src/box/CMakeLists.txt           |    2 +
 src/box/lua/init.c               |    3 +
 src/box/lua/key_def.c            |  217 +++++
 src/box/lua/key_def.h            |   61 ++
 src/box/lua/merger.c             | 1402 ++++++++++++++++++++++++++++++
 src/box/lua/merger.h             |   47 +
 src/box/lua/net_box.c            |   49 ++
 src/box/lua/net_box.lua          |    1 +
 src/box/lua/tuple.c              |   91 +-
 src/box/lua/tuple.h              |   15 +
 src/lua/msgpack.c                |   66 ++
 src/lua/utils.c                  |  109 +++
 src/lua/utils.h                  |   38 +
 test/app-tap/module_api.c        |   23 +
 test/app-tap/module_api.test.lua |  172 +++-
 test/app-tap/msgpack.test.lua    |  157 +++-
 test/box-tap/merger.test.lua     |  558 ++++++++++++
 test/box-tap/suite.ini           |    1 +
 test/box/net.box.result          |   58 ++
 test/box/net.box.test.lua        |   26 +
 22 files changed, 3072 insertions(+), 27 deletions(-)
 create mode 100644 src/box/lua/key_def.c
 create mode 100644 src/box/lua/key_def.h
 create mode 100644 src/box/lua/merger.c
 create mode 100644 src/box/lua/merger.h
 create mode 100755 test/box-tap/merger.test.lua

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2.20.1