[Tarantool-patches] [PATCH] sql: allow accessing list of collations via pragma

[Chris Sosnin]

Hi! Thank you for the review!

> Content returned by 'pragma collation_list' is already verified in
> sql-tap/collation.test.lua. So I guess it is enough to check that
> box.execute("pragma collation_list") does not throw an error.

I'm sorry, didn't notice such test exists. I changed the patch so it only
checks for an error:
+-- gh-4713 "PRAGMA collation_list" is not accessible to all users
+_, err = box.execute('pragma collation_list')
+assert(err == nil)

See the whole patch below.

'pragma collation_list' uses _collation space, although user
may have no access to it. Thus, we replace it with the
corresponding view.

Closes #4713
---
branch: https://github.com/tarantool/tarantool/tree/ksosnin/gh-4713-pragma-collation-list
issue: https://github.com/tarantool/tarantool/issues/4713

 src/box/sql/pragma.c        |  2 +-
 test/sql/collation.result   | 10 ++++++----
 test/sql/collation.test.lua |  5 +++--
 3 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/src/box/sql/pragma.c b/src/box/sql/pragma.c
index 28ba64500..636f519ef 100644
--- a/src/box/sql/pragma.c
+++ b/src/box/sql/pragma.c
@@ -241,7 +241,7 @@ sql_pragma_collation_list(struct Parse *parse_context)
 	char key_buf[16];
 	char *key_end = mp_encode_array(key_buf, 0);
 	box_tuple_t *tuple;
-	box_iterator_t *it = box_index_iterator(BOX_COLLATION_ID, 0, ITER_ALL,
+	box_iterator_t *it = box_index_iterator(BOX_VCOLLATION_ID, 0, ITER_ALL,
 						key_buf, key_end);
 	if (it == NULL) {
 		parse_context->is_aborted = true;
diff --git a/test/sql/collation.result b/test/sql/collation.result
index 4e43a7cb7..4e4c27ef0 100644
--- a/test/sql/collation.result
+++ b/test/sql/collation.result
@@ -360,11 +360,13 @@ box.schema.user.create('tmp')
 box.session.su('tmp')
 ---
 ...
--- Error: read access to space is denied.
-box.execute("pragma collation_list")
+-- gh-4713 "PRAGMA collation_list" is not accessible to all users
+_, err = box.execute('pragma collation_list')
 ---
-- null
-- Read access to space '_collation' is denied for user 'tmp'
+...
+assert(err == nil)
+---
+- true
 ...
 box.session.su('admin')
 ---
diff --git a/test/sql/collation.test.lua b/test/sql/collation.test.lua
index 9a2042c09..407fc19dc 100644
--- a/test/sql/collation.test.lua
+++ b/test/sql/collation.test.lua
@@ -103,8 +103,9 @@ box.schema.user.revoke('guest', 'read,write,execute', 'universe')
 -- gh-3857 "PRAGMA collation_list" invokes segmentation fault.
 box.schema.user.create('tmp')
 box.session.su('tmp')
--- Error: read access to space is denied.
-box.execute("pragma collation_list")
+-- gh-4713 "PRAGMA collation_list" is not accessible to all users
+_, err = box.execute('pragma collation_list')
+assert(err == nil)
 box.session.su('admin')
 box.schema.user.drop('tmp')
 
-- 
2.21.0 (Apple Git-122.2)