MDEV-26392: Crash with json_get_path_next and 10.5.12

Analysis:
When we skip level when path is found, it changes the state of the json
engine. This breaks the sequence for json_get_path_next() which is called at
the end to ensure json document is valid and leads to crash.
Fix:
Use json_scan_next() at the end to check if json document has correct
syntax (is valid).

1 files changed, 12 insertions, 0 deletions

diff --git a/mysql-test/main/func_json.test b/mysql-test/main/func_json.test
index 7e7b83c720d..35645bcb226 100644
--- a/mysql-test/main/func_json.test
+++ b/mysql-test/main/func_json.test
@@ -1054,6 +1054,18 @@ DROP TABLE t2;
 SELECT json_object('a', if(1, json_object('b', 'c'), json_object('e', 'f')));
 SELECT json_object('a', coalesce(json_object('b', 'c')));
 
+--echo #
+--echo # MDEV-26392: Crash with json_get_path_next and 10.5.12
+--echo #
+
+CREATE TABLE arrNestTest (
+    id VARCHAR(80) AS (JSON_COMPACT(JSON_EXTRACT(doc, "$._id"))) UNIQUE KEY,
+    doc JSON, 
+    CONSTRAINT id_not_null CHECK(id IS NOT NULL));
+    
+INSERT INTO test.arrNestTest (doc) VALUES ('{ "_id" : { "$oid" : "611c0a463b150154132f6636" }, "a" : [ { "a" : [ { "a" : [ { "a" : [ { "a" : [ { "a" : [ { "a" : [ { "a" : [ { "a" : [ { "a" : [ { "a" : [ { "a" : [ { "a" : [ { "a" : [ { "a" : [ { "a" : 1.0 } ] } ] } ] } ] } ] } ] } ] } ] } ] } ] } ] } ] } ] } ] } ] }');
+SELECT * FROM arrNestTest;
+DROP TABLE arrNestTest;
 
 --echo #
 --echo # End of 10.5 tests