fix jsonb multibyte character invisible problem

src/common/backend/utils/adt/json.cpp

@@ -2107,7 +2107,7 @@ void escape_json(StringInfo buf, const char *str)
                     appendStringInfo(buf, "\\u%04x", (int) *p);
                 } else {
                     for (int i = 0; i < charlen; i++) {
-                        appendStringInfoCharMacro(buf, *p);
+                        appendStringInfoCharMacro(buf, *(p + i));
                     }
                 }
                 break;

src/test/regress/expected/json.out

@@ -79,6 +79,12 @@ SELECT '"\uaBcD"'::json;		-- OK, uppercase and lower case both OK
  "\uaBcD"
 (1 row)
 
+SELECT '"哈1哈"'::jsonb;                -- OK
+  jsonb  
+---------
+ "哈1哈"
+(1 row)
+
 -- Numbers.
 SELECT '1'::json;				-- OK
  json 

src/test/regress/expected/jsonb.out

@@ -73,6 +73,12 @@ SELECT '"\u0000"'::jsonb;		-- OK, legal escape
  "\\u0000"
 (1 row)
 
+SELECT '"哈1哈"'::jsonb;		-- OK
+  jsonb  
+---------
+ "哈1哈"
+(1 row)
+
 -- use octet_length here so we don't get an odd unicode char in the
 -- output
 SELECT octet_length('"\uaBcD"'::jsonb::text); -- OK, uppercase and lower case both OK

src/test/regress/sql/json.sql

@@ -12,6 +12,7 @@ SELECT '"\u00"'::json;			-- ERROR, incomplete escape
 SELECT '"\u000g"'::json;		-- ERROR, g is not a hex digit
 SELECT '"\u0000"'::json;		-- OK, legal escape
 SELECT '"\uaBcD"'::json;		-- OK, uppercase and lower case both OK
+SELECT '"哈1哈"'::jsonb;                -- OK
 
 -- Numbers.
 SELECT '1'::json;				-- OK

src/test/regress/sql/jsonb.sql

@@ -11,6 +11,7 @@ SELECT '"\u"'::jsonb;			-- ERROR, incomplete escape
 SELECT '"\u00"'::jsonb;			-- ERROR, incomplete escape
 SELECT '"\u000g"'::jsonb;		-- ERROR, g is not a hex digit
 SELECT '"\u0000"'::jsonb;		-- OK, legal escape
+SELECT '"哈1哈"'::jsonb;		-- OK
 -- use octet_length here so we don't get an odd unicode char in the
 -- output
 SELECT octet_length('"\uaBcD"'::jsonb::text); -- OK, uppercase and lower case both OK