[PlSql] Fix JSON_OBJECT to allow FORMAT JSON for all entry types

Author: lbovet

sql/plsql/PlSqlParser.g4

@@ -6555,9 +6555,10 @@ json_object_content
     ;
 
 json_object_entry
-    : KEY? expression (VALUE | IS)? expression
-    | expression ':' expression (FORMAT JSON)?
-    | identifier
+    : (KEY? expression (VALUE | IS)? expression
+        | expression ':' expression
+        | identifier
+    ) (FORMAT JSON)?
     ;
 
 json_table_clause

sql/plsql/examples/json_sql.sql

@@ -9,6 +9,8 @@ ORDER BY d.department_id;
 
 SELECT JSON_OBJECT(KEY 'VALUE' VALUE COL), t.*  FROM T t;
 
+SELECT JSON_OBJECT(KEY 'VALUE' VALUE COL FORMAT JSON), t.*  FROM T t;
+
 SELECT JSON_ARRAY (
                JSON_OBJECT('percentage' VALUE .50),
                JSON_ARRAY(1,2,3),