MDEV-12312 JSON_CONTAINS_PATH does not detect invalid path and returns

TRUE.

        Let's make empty brackets to be the syntax error in the JSON
        paths.

mysql-test/r/func_json.result

@@ -720,3 +720,8 @@ json_data
 SELECT JSON_OBJECT("user","Jožko Mrkvičká") as json_data;
 json_data
 {"user": "Jožko Mrkvičká"}
+select json_contains_path('{"foo":"bar"}', 'one', '$[]');
+json_contains_path('{"foo":"bar"}', 'one', '$[]')
+NULL
+Warnings:
+Warning	4042	Syntax error in JSON path in argument 3 to function 'json_contains_path' at position 3

mysql-test/t/func_json.test

@@ -370,3 +370,11 @@ select json_array(5,json_query('[1,2]','$'));
 
 SELECT JSON_ARRAY('1. ě 2. š 3. č 4. ř 5. ž 6. ý 7. á 8. í 9. é 10. ů 11. ú') AS json_data;
 SELECT JSON_OBJECT("user","Jožko Mrkvičká") as json_data;
+
+
+#
+# MDEV-12312 JSON_CONTAINS_PATH does not detect invalid path and returns TRUE.
+#
+
+select json_contains_path('{"foo":"bar"}', 'one', '$[]');
+

strings/json_lib.c

@@ -1043,7 +1043,7 @@ static int json_path_transitions[N_PATH_STATES][N_PATH_CLASSES]=
 /* PT */  { PS_OK,  JE_SYN, PS_AST, PS_AR,  JE_SYN, PS_KEY, JE_SYN, JE_SYN,
             JE_SYN, JE_SYN, JE_SYN, JE_SYN, JE_SYN, JE_SYN,
             JE_NOT_JSON_CHR, JE_BAD_CHR},
-/* AR */  { JE_EOS, JE_SYN, PS_AWD, JE_SYN, PS_PT,  JE_SYN, PS_Z,
+/* AR */  { JE_EOS, JE_SYN, PS_AWD, JE_SYN, JE_SYN, JE_SYN, PS_Z,
             PS_INT, JE_SYN, JE_SYN, PS_SAR, JE_SYN, JE_SYN, JE_SYN,
             JE_NOT_JSON_CHR, JE_BAD_CHR},
 /* SAR */ { JE_EOS, JE_SYN, PS_AWD, JE_SYN, PS_PT,  JE_SYN, PS_Z,