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box: make functional index creation transactional
Kirill Shcherbatov authored 
The _func_index space trigger used to reject an insertion of a
tuple that defines an invalid functional index.
As insertion in _index space had been completed before, a garbage
is kept in _index space in such case.

We need to do something with the yelding _func_index trigger(that
rebuilds an index) to wrap all index creation operation in DDL
transaction in further patches (because only the first DDL
operation may yeld now).

This problem could be trivially solved with preparatory
initialization of index_def function ponter: the memtx_tree
index construction would perform all required job in such case.
Therefore the following index rebuild in _func_index trigger
becomes redundant and should be omitted.

In other words, a trivial prefetch operation makes possible
a transactional index creation (with space:create_index operation).

As for index construction during recovery (a lack of function
cache during recovery was the main motivation to introduce
_func_index space), it's workflow is kept unchanged.

Follow up #1250
Needed for #4348
Closes #4401
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Tarantool

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https://tarantool.io/en/

Tarantool is an in-memory database and application server.

Key features of the application server:

  • 100% compatible drop-in replacement for Lua 5.1, based on LuaJIT 2.1. Simply use #!/usr/bin/tarantool instead of #!/usr/bin/lua in your script.
  • full support for Lua modules and a rich set of own modules, including cooperative multitasking, non-blocking I/O, access to external databases, etc

Key features of the database:

  • ANSI SQL, including views, joins, referential and check constraints
  • MsgPack data format and MsgPack based client-server protocol
  • two data engines: 100% in-memory with optional persistence and an own implementation of LSM-tree, to use with large data sets
  • multiple index types: HASH, TREE, RTREE, BITSET
  • asynchronous master-master replication
  • authentication and access control
  • the database is just a C extension to the application server and can be turned off

Supported platforms are Linux/x86 and FreeBSD/x86, Mac OS X.

Tarantool is ideal for data-enriched components of scalable Web architecture: queue servers, caches, stateful Web applications.

To download and install Tarantool as a binary package for your OS, please visit https://tarantool.io/en/download/.

To build Tarantool from source, see detailed instructions in the Tarantool documentation at https://tarantool.io/en/doc/2.1/dev_guide/building_from_source/.

Please report bugs at https://github.com/tarantool/tarantool/issues We also warmly welcome your feedback in the discussion mailing list, tarantool@googlegroups.com.

Thank you for your interest in Tarantool!