[PATCH v2 0/4] Reuse tuple formats for ephemeral spaces

[Kirill Yukhin <kyukhin@tarantool.org>]

This patchset makes it possible to re-use tuple_format around
multiple ephemeral spaces. This is needed when many SQL requests
are served at the same time. In this case for almost each non-trivial
SELECT request ephemeral space is created with its own format.
Since removal of ephemeral spaces doesn't mean removal of format,
and formats count is limited, it is pretty much simple to run out of
formats.
This occurs on TPC-C benchmark, when number of clients > 32.

Issue https://github.com/tarantool/tarantool/issues/3924
Branch https://github.com/tarantool/tarantool/commits/kyukhin/gh-3924-reuse-eph-formats

Kirill Yukhin (4):
  Pass necessary fields to tuple_format contructor
  Set is_temporary flag for formats of ephemeral spaces
  sql: set error type in case of ephemral space creation failure
  Allow to reuse tuple_formats for ephemeral spaces

ChangeLog:
  - Fixed all nits pointed
  - Hashing of formats refactored: extracted into dedicated
    routine()
  - Moved initialization of hasher to tuple_init()
  - Removed dead code from test.

 src/box/blackhole.c             |   7 +-
 src/box/box.cc                  |   1 +
 src/box/memtx_engine.c          |   6 ++
 src/box/memtx_space.c           |   9 +-
 src/box/space.c                 |   3 +-
 src/box/space_def.c             |  16 +++
 src/box/space_def.h             |  14 +++
 src/box/sql.c                   |   6 +-
 src/box/sql/vdbe.c              |   4 +-
 src/box/tuple.c                 |  13 ++-
 src/box/tuple_format.c          | 184 +++++++++++++++++++++++++++++---
 src/box/tuple_format.h          |  31 +++++-
 src/box/vinyl.c                 |  12 ++-
 src/box/vy_lsm.c                |  10 +-
 src/errinj.h                    |   2 +
 test/box/errinj.result          |   8 +-
 test/sql/errinj.result          |  36 +++++++
 test/sql/errinj.test.lua        |  13 +++
 test/unit/tuple_bigref.c        |   1 +
 test/unit/vy_iterators_helper.c |  14 +--
 test/unit/vy_mem.c              |   5 +-
 test/unit/vy_point_lookup.c     |   5 +-
 22 files changed, 342 insertions(+), 58 deletions(-)

-- 
2.19.1