MDEV-25875: JSON_TABLE: extract document fragment into JSON column

Accept JSON values for the JSON fields.

mysql-test/suite/json/r/json_table.result

@@ -953,6 +953,20 @@ converted	original
 Warnings:
 Warning	1264	Out of range value for column 'converted' at row 2
 Warning	1366	Incorrect integer value: 'foo' for column ``.`(temporary)`.`converted` at row 3
+select * from
+json_table('[{"color": "blue",  "price": { "high": 10, "low": 5}},
+               {"color": "white",   "price": "pretty low"},
+               {"color": "yellow",  "price": 256.20},
+               {"color": "red",   "price": { "high": 20, "low": 8}}]',
+'$[*]' columns(color varchar(100) path '$.color',
+price json path '$.price'
+                        )
+) as T;
+color	price
+blue	{ "high": 10, "low": 5}
+white	"pretty low"
+yellow	256.20
+red	{ "high": 20, "low": 8}
 #
 # MDEV-27696 Json table columns accept redundant COLLATE syntax
 #