[tarantool-patches] [PATCH v1 1/1] sql: fix segfault with check referencing new table

[Kirill Shcherbatov <kshcherbatov@tarantool.org>]

Starting with 9a54320 on tuple insertion in _space we
make sql_checks_resolve_space_def_reference for checks
if any. During executing on_replace_dd_space trigger
box_space_id_by_name that takes a look to _space space
returnes not-nullable value, but the same time space
object doesn't present in space chache and could not be
found with space_by_id.
Before 1.10 path 0ecabde merged to 2.0 as a part of 13df2b1
box_space_id_by_name returned BOX_ID_NIL because of
"multi-engine transaction error" that is not rased in same
situation now.

Closes #3611.
---
Branch: http://github.com/tarantool/tarantool/tree/kshch/gh-3611-subquery-with-self-reference-check
Issue: https://github.com/tarantool/tarantool/issues/3611

 src/box/sql/select.c     | 5 ++---
 test/sql/checks.result   | 8 ++++++++
 test/sql/checks.test.lua | 4 ++++
 3 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/src/box/sql/select.c b/src/box/sql/select.c
index d824b8b..6738ba5 100644
--- a/src/box/sql/select.c
+++ b/src/box/sql/select.c
@@ -4817,14 +4817,13 @@ selectExpander(Walker * pWalker, Select * p)
 				int space_id =
 					box_space_id_by_name(t_name,
 							     strlen(t_name));
-				if (space_id == BOX_ID_NIL) {
+				struct space *space = space_by_id(space_id);
+				if (space == NULL) {
 					sqlite3ErrorMsg(pParse,
 							"no such table: %s",
 							t_name);
 					return WRC_Abort;
 				}
-				struct space *space = space_by_id(space_id);
-
 				if (space->def->field_count <= 0) {
 					sqlite3ErrorMsg(pParse, "no format for"\
 							" space: %s", t_name);
diff --git a/test/sql/checks.result b/test/sql/checks.result
index 2a31b01..094367a 100644
--- a/test/sql/checks.result
+++ b/test/sql/checks.result
@@ -105,6 +105,14 @@ s = box.space._space:insert(t)
 ---
 - error: 'Wrong space options (field 5): invalid MsgPack map field ''name'' type'
 ...
+box.sql.execute("CREATE TABLE w2 (s1 INT PRIMARY KEY, CHECK ((SELECT COUNT(*) FROM w2) = 0));")
+---
+- error: 'Failed to create space ''W2'': SQL error: no such table: W2'
+...
+box.sql.execute("DROP TABLE w2;")
+---
+- error: 'no such table: W2'
+...
 test_run:cmd("clear filter")
 ---
 - true
diff --git a/test/sql/checks.test.lua b/test/sql/checks.test.lua
index 7ff78fe..bbd6747 100644
--- a/test/sql/checks.test.lua
+++ b/test/sql/checks.test.lua
@@ -43,4 +43,8 @@ format = {{name = 'X', type = 'unsigned'}}
 t = {513, 1, 'test', 'memtx', 0, opts, format}
 s = box.space._space:insert(t)
 
+
+box.sql.execute("CREATE TABLE w2 (s1 INT PRIMARY KEY, CHECK ((SELECT COUNT(*) FROM w2) = 0));")
+box.sql.execute("DROP TABLE w2;")
+
 test_run:cmd("clear filter")
-- 
2.7.4