Hi.
based on v22.
I added some tests again json_value for the sake of coverager test.
A previous email thread mentioned needing to check *empty in ExecEvalJsonExpr.
since JSON_VALUE_OP, JSON_QUERY_OP, JSON_EXISTS_OP all need to have
*empty cases, So I refactored a little bit.
might be helpful. Maybe we can also refactor *error cases.
The following part is not easy to understand.
res = ExecPrepareJsonItemCoercion(jbv,
+ jsestate->item_jcstates,
+ &post_eval->jcstate);
+ if (post_eval->jcstate &&
+ post_eval->jcstate->coercion &&
+ (post_eval->jcstate->coercion->via_io ||
+ post_eval->jcstate->coercion->via_populate))
