for sql like:
SELECT JSONB_EXTRACT('{"k1":"v31","k2":300}','$.k1');
the result should be
+------------------------------------------------+
| jsonb_extract('{"k1":"v31","k2":300}', '$.k1') |
+------------------------------------------------+
| "v31" |
+------------------------------------------------+
but curent result is
+------------------------------------------------+
| jsonb_extract('{"k1":"v31","k2":300}', '$.k1') |
+------------------------------------------------+
| <null> |
+------------------------------------------------+