[Tarantool-patches] [PATCH v2 0/2] Add constraint names hash table to space

[Roman Khabibov <roman.habibov@tarantool.org>]

I have made essential changes to the previous patch, so I decided
to send it as v2.

1) I still don't understand, why we need to store constraint id. If we have the
query "ALTER TABLE T DROP CONSTRAINT C", we just get struct space by its name,
then find the corresponding constraint_def node by the name and emit opcode on
replace in _index/_fk_constraint/_ck_constraint depending on
constraint_def->type.

2) space_delete()
I don't know how to check, if the hash table is empty, because it jsut freed.

salad/mhash.h
void
_mh(delete)(struct _mh(t) *h)
{
	if (h->shadow->p) {
		free(h->shadow->p);
		free(h->shadow->b);
		memset(h->shadow, 0, sizeof(*h->shadow));
	}
	free(h->shadow);
	free(h->b);
	free(h->p);
	free(h);
}

3) I copy names of constraints instead of use index_def->name or
ck_constraint_def->name or fk_constraint_def->name, because in some cases these
defs can be freed. I discovered it during degugging, when I haven't use name copy
yet: there was node in the hash table with name length and hash, but without name
itself. Now, I decided to store duplicates in struct constraint_def.

Issue: https://github.com/tarantool/tarantool/issues/3503
Branch: https://github.com/tarantool/tarantool/tree/romanhabibov/gh-3503-constr-names_v3

Roman Khabibov (2):
  box: introduce constraint names hash table
  sql: make constraint operations transactional

 src/box/CMakeLists.txt       |   1 +
 src/box/alter.cc             | 427 +++++++++++++++++++++++++++++++----
 src/box/constraint_def.c     |  59 +++++
 src/box/constraint_def.h     |  83 +++++++
 src/box/space.c              |  56 +++++
 src/box/space.h              |  39 ++++
 test/sql/constraint.result   | 190 ++++++++++++++++
 test/sql/constraint.test.lua |  84 +++++++
 8 files changed, 892 insertions(+), 47 deletions(-)
 create mode 100755 src/box/constraint_def.c
 create mode 100755 src/box/constraint_def.h
 create mode 100644 test/sql/constraint.result
 create mode 100755 test/sql/constraint.test.lua

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