MDEV-32007: JSON_VALUE and JSON_EXTRACT doesn't handle dash (-)

as first character in key

Analysis:
While parsing the path, if '-' is encountered as a part of the key,
the state of the parser changes to error. Hence NULL is returned eventually.

Fix:
If '-' encountered as part of the key, change the state appropriately to
continue scanning the key.

mysql-test/main/func_json.result

@@ -2608,3 +2608,24 @@ SET @@collation_connection= @save_collation_connection;
 #
 # End of 10.9 Test
 #
+#
+# MDEV-32007: JSON_VALUE and JSON_EXTRACT doesn't handle dash (-)
+#             as first character in key
+#
+CREATE TEMPORARY TABLE IF NOT EXISTS jsonTest AS
+SELECT '{ "-1234" : "something",
+                 "12-34" : "else",
+                 "1234-" : "and",
+                 "1234" : "match" }' AS 'message';
+SELECT JSON_SEARCH(message, 'one', 'something') AS t1_path,
+JSON_VALUE(message, JSON_UNQUOTE(JSON_SEARCH(message, 'one', 'something'))) AS t1_result,
+JSON_SEARCH(message, 'one', 'else') AS t2_path,
+JSON_VALUE(message, JSON_UNQUOTE(JSON_SEARCH(message, 'one', 'else'))) AS t2_result,
+JSON_SEARCH(message, 'one', 'and') AS t3_path,
+JSON_VALUE(message, JSON_UNQUOTE(JSON_SEARCH(message, 'one', 'and'))) AS t3_result,
+JSON_SEARCH(message, 'one', 'match') AS t4_path,
+JSON_VALUE(message, JSON_UNQUOTE(JSON_SEARCH(message, 'one', 'match'))) AS t4_result
+FROM jsonTest;
+t1_path	t1_result	t2_path	t2_result	t3_path	t3_result	t4_path	t4_result
+"$.-1234"	something	"$.12-34"	else	"$.1234-"	and	"$.1234"	match
+# End of 11.0 test

mysql-test/main/func_json.test

@@ -1809,3 +1809,26 @@ SET @@collation_connection= @save_collation_connection;
 --echo #
 --echo # End of 10.9 Test
 --echo #
+
+--echo #
+--echo # MDEV-32007: JSON_VALUE and JSON_EXTRACT doesn't handle dash (-)
+--echo #             as first character in key
+--echo #
+
+CREATE TEMPORARY TABLE IF NOT EXISTS jsonTest AS
+       SELECT '{ "-1234" : "something",
+                 "12-34" : "else",
+                 "1234-" : "and",
+                 "1234" : "match" }' AS 'message';
+
+SELECT JSON_SEARCH(message, 'one', 'something') AS t1_path,
+       JSON_VALUE(message, JSON_UNQUOTE(JSON_SEARCH(message, 'one', 'something'))) AS t1_result,
+       JSON_SEARCH(message, 'one', 'else') AS t2_path,
+       JSON_VALUE(message, JSON_UNQUOTE(JSON_SEARCH(message, 'one', 'else'))) AS t2_result,
+       JSON_SEARCH(message, 'one', 'and') AS t3_path,
+       JSON_VALUE(message, JSON_UNQUOTE(JSON_SEARCH(message, 'one', 'and'))) AS t3_result,
+       JSON_SEARCH(message, 'one', 'match') AS t4_path,
+       JSON_VALUE(message, JSON_UNQUOTE(JSON_SEARCH(message, 'one', 'match'))) AS t4_result
+FROM jsonTest;
+
+--echo # End of 11.0 test

strings/json_lib.c

@@ -1093,7 +1093,7 @@ static int json_path_transitions[N_PATH_STATES][N_PATH_CLASSES]=
 /* AS */  { JE_EOS, JE_SYN, JE_SYN, JE_SYN, PS_T, PS_PT, JE_SYN, PS_NEG,
             PS_Z, PS_INT, PS_LAST, PS_AS, JE_SYN, JE_SYN, JE_SYN,
             JE_NOT_JSON_CHR, JE_BAD_CHR},
-/* KEY */ { JE_EOS, PS_KNM, PS_KWD, JE_SYN, PS_KNM, PS_KNM, JE_SYN, JE_SYN,
+/* KEY */ { JE_EOS, PS_KNM, PS_KWD, JE_SYN, PS_KNM, PS_KNM, JE_SYN, PS_KNM,
             PS_KNM, PS_KNM, PS_KNM, PS_KNM, PS_KNM, JE_SYN, PS_KEYX, PS_KNM,
             JE_NOT_JSON_CHR, JE_BAD_CHR},
 /* KNM */ { PS_KOK, PS_KNM, PS_AST, PS_EAR, PS_KNM, PS_KNM, PS_EKY, PS_KNM,