[Tarantool-patches] [PATCH] sequence: return correct error on using dropped sequence

[Chris Sosnin <k.sosnin@tarantool.org>]

This code is called from C, so it shouldn't throw.

Closes #4753
---
branch: https://github.com/tarantool/tarantool/tree/ksosnin/gh-4753-sequence-cpp-exception 
issue: https://github.com/tarantool/tarantool/issues/4753

 src/box/schema.cc          |  2 +-
 test/box/sequence.result   | 17 +++++++++++++++++
 test/box/sequence.test.lua |  8 ++++++++
 3 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/src/box/schema.cc b/src/box/schema.cc
index fab7544f2..456eef429 100644
--- a/src/box/schema.cc
+++ b/src/box/schema.cc
@@ -646,7 +646,7 @@ sequence_cache_find(uint32_t id)
 {
 	struct sequence *seq = sequence_by_id(id);
 	if (seq == NULL)
-		tnt_raise(ClientError, ER_NO_SUCH_SEQUENCE, int2str(id));
+		diag_set(ClientError, ER_NO_SUCH_SEQUENCE, int2str(id));
 	return seq;
 }
 
diff --git a/test/box/sequence.result b/test/box/sequence.result
index 0a6cfee2c..32a094d6f 100644
--- a/test/box/sequence.result
+++ b/test/box/sequence.result
@@ -2102,6 +2102,23 @@ s:drop()
 ---
 ...
 --
+-- gh-4753: accessing dropped sequence should yield correct error
+--
+s = box.schema.sequence.create('s')
+---
+...
+s:drop()
+---
+...
+s:next()
+---
+- error: Sequence '1' does not exist
+...
+s:reset()
+---
+- error: Sequence '1' does not exist
+...
+--
 -- Check that altering parts of a primary index with a sequence
 -- attached requires sequence update. Renaming fields does not.
 --
diff --git a/test/box/sequence.test.lua b/test/box/sequence.test.lua
index 8e00571e5..d8a212fab 100644
--- a/test/box/sequence.test.lua
+++ b/test/box/sequence.test.lua
@@ -710,6 +710,14 @@ s.index.pk:alter{sequence = {field = 'x.a.b[1]'}}
 s:replace{{a = {b = {box.NULL}}}} -- ok
 s:drop()
 
+--
+-- gh-4753: accessing dropped sequence should yield correct error
+--
+s = box.schema.sequence.create('s')
+s:drop()
+s:next()
+s:reset()
+
 --
 -- Check that altering parts of a primary index with a sequence
 -- attached requires sequence update. Renaming fields does not.
-- 
2.21.1 (Apple Git-122.3)