MDEV-16620 JSON_ARRAYAGG and JSON_OBJECTAGG.

Ison_objectagg implemented.

mysql-test/main/func_json.result

@@ -1198,7 +1198,17 @@ JSON_ARRAYAGG(JSON_OBJECT('a', a, 'b', b))
 SELECT JSON_ARRAYAGG(a, b) FROM t1;
 ERROR 42000: Incorrect parameter count in the call to native function 'JSON_ARRAYAGG'
 SELECT JSON_ARRAYAGG(JSON_ARRAYAGG(a, b)) FROM t1;
+ERROR 42000: Incorrect parameter count in the call to native function 'JSON_ARRAYAGG'
+SELECT JSON_ARRAYAGG(JSON_ARRAYAGG(a)) FROM t1;
 ERROR HY000: Invalid use of group function
+#
+# MDEV-16620 JSON_OBJECTAGG
+#
+SELECT JSON_OBJECTAGG(a, b) FROM t1;
+JSON_OBJECTAGG(a, b)
+{"1":"Hello", "1":"World", "2":"This", "2":"Will", "2":"Work", "2":"!", "3":null, "1":"Hello", "1":"World", "2":"This", "2":"Will", "2":"Work", "2":"!", "3":null}
+SELECT JSON_OBJECTAGG(a) FROM t1;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near ') FROM t1' at line 1
 DROP TABLE t1;
 #
 # End of 10.4 tests

mysql-test/main/func_json.test

@@ -713,9 +713,20 @@ SELECT JSON_ARRAYAGG(JSON_OBJECT('a', a, 'b', b)) FROM t1 GROUP BY a;
 --error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT
 SELECT JSON_ARRAYAGG(a, b) FROM t1;
 
---error ER_INVALID_GROUP_FUNC_USE
+--error  ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT
 SELECT JSON_ARRAYAGG(JSON_ARRAYAGG(a, b)) FROM t1;
 
+--error ER_INVALID_GROUP_FUNC_USE
+SELECT JSON_ARRAYAGG(JSON_ARRAYAGG(a)) FROM t1;
+
+-- echo #
+-- echo # MDEV-16620 JSON_OBJECTAGG
+-- echo #
+
+SELECT JSON_OBJECTAGG(a, b) FROM t1;
+--error ER_PARSE_ERROR
+SELECT JSON_OBJECTAGG(a) FROM t1;
+
 DROP TABLE t1;
 
 --echo #

sql/item_jsonfunc.cc

@@ -3643,3 +3643,119 @@ String* Item_func_json_arrayagg::val_str(String *str)
 
   return str;
 }
+
+
+Item_func_json_objectagg::
+Item_func_json_objectagg(THD *thd, Item_func_json_objectagg *item)
+  :Item_sum(thd, item)
+{
+  result.set_charset(collation.collation);
+  result.append("{");
+}
+
+
+bool
+Item_func_json_objectagg::fix_fields(THD *thd, Item **ref)
+{
+  uint i;                       /* for loop variable */
+  DBUG_ASSERT(fixed == 0);
+
+  if (init_sum_func_check(thd))
+    return TRUE;
+
+  maybe_null= 1;
+
+  /*
+    Fix fields for select list and ORDER clause
+  */
+
+  for (i=0 ; i < arg_count ; i++)
+  {
+    if (args[i]->fix_fields_if_needed_for_scalar(thd, &args[i]))
+      return TRUE;
+    m_with_subquery|= args[i]->with_subquery();
+    with_param|= args[i]->with_param;
+    with_window_func|= args[i]->with_window_func;
+  }
+
+  /* skip charset aggregation for order columns */
+  if (agg_arg_charsets_for_string_result(collation, args, arg_count))
+    return 1;
+
+  result.set_charset(collation.collation);
+  result_field= 0;
+  null_value= 1;
+  max_length= (uint32)(thd->variables.group_concat_max_len
+              / collation.collation->mbminlen
+              * collation.collation->mbmaxlen);
+
+  if (check_sum_func(thd, ref))
+    return TRUE;
+
+  fixed= 1;
+  return FALSE;
+}
+
+
+void Item_func_json_objectagg::cleanup()
+{
+  DBUG_ENTER("Item_func_json_objectagg::cleanup");
+  Item_sum::cleanup();
+
+  result.length(1);
+  DBUG_VOID_RETURN;
+}
+
+
+Item *Item_func_json_objectagg::copy_or_same(THD* thd)
+{
+  return new (thd->mem_root) Item_func_json_objectagg(thd, this);
+}
+
+
+void Item_func_json_objectagg::clear()
+{
+  result.length(1);
+  null_value= 1;
+}
+
+
+bool Item_func_json_objectagg::add()
+{
+  StringBuffer<MAX_FIELD_WIDTH> buf;
+  String *key;
+
+  key= args[0]->val_str(&buf);
+  if (args[0]->is_null())
+    return 0;
+
+  null_value= 0;
+  if (result.length() > 1)
+    result.append(", ");
+
+  result.append("\"");
+  result.append(*key);
+  result.append("\":");
+
+  buf.length(0);
+  append_json_value(&result, args[1], &buf);
+
+  return 0;
+}
+
+
+String* Item_func_json_objectagg::val_str(String* str)
+{
+  DBUG_ASSERT(fixed == 1);
+  if (null_value)
+    return 0;
+
+  result.append("}");
+  return &result;
+}
+
+
+void Item_func_json_objectagg::print(String *str, enum_query_type query_type)
+{
+}
+

sql/item_jsonfunc.h

@@ -527,7 +527,6 @@ public:
 class Item_func_json_arrayagg : public Item_func_group_concat
 {
 public:
-
   Item_func_json_arrayagg(THD *thd, Name_resolution_context *context_arg,
                           bool is_distinct, List<Item> *is_select,
                           const SQL_I_List<ORDER> &is_order, String *is_separator,
@@ -536,6 +535,8 @@ public:
                              is_separator, limit_clause, row_limit, offset_limit)
   {
   }
+  Item_func_json_arrayagg(THD *thd, Item_func_json_arrayagg *item);
+  bool is_json_type() { return true; }
 
   const char *func_name() const { return "json_arrayagg("; }
   enum Sumfunctype sum_func() const {return JSON_ARRAYAGG_FUNC;}
@@ -548,6 +549,58 @@ public:
   {
     return Item_func_group_concat::add(false);
   }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_json_arrayagg>(thd, this); }
+};
+
+
+class Item_func_json_objectagg : public Item_sum
+{
+  String result;
+public:
+  Item_func_json_objectagg(THD *thd, Item *key, Item *value) :
+    Item_sum(thd, key, value)
+  {
+    result.append("{");
+  }
+
+  Item_func_json_objectagg(THD *thd, Item_func_json_objectagg *item);
+  bool is_json_type() { return true; }
+  void cleanup();
+
+  enum Sumfunctype sum_func () const {return GROUP_CONCAT_FUNC;}
+  const char *func_name() const { return "json_objectagg("; }
+  const Type_handler *type_handler() const
+  {
+    if (too_big_for_varchar())
+      return &type_handler_blob;
+    return &type_handler_varchar;
+  }
+  void clear();
+  bool add();
+  void reset_field() { DBUG_ASSERT(0); }        // not used
+  void update_field() { DBUG_ASSERT(0); }       // not used
+  bool fix_fields(THD *,Item **);
+
+  double val_real()
+  { return 0.0; }
+  longlong val_int()
+  { return 0; }
+  my_decimal *val_decimal(my_decimal *decimal_value)
+  {
+    my_decimal_set_zero(decimal_value);
+    return decimal_value;
+  }
+  bool get_date(THD *thd, MYSQL_TIME *ltime, date_mode_t fuzzydate)
+  {
+    return get_date_from_string(thd, ltime, fuzzydate);
+  }
+  String* val_str(String* str);
+  Item *copy_or_same(THD* thd);
+  void no_rows_in_result() {}
+  void print(String *str, enum_query_type query_type);
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_json_objectagg>(thd, this); }
 };
 
 

sql/item_sum.cc

@@ -3652,14 +3652,6 @@ int dump_leaf_key(void* key_arg, element_count count __attribute__((unused)),
   if (item->limit_clause && !(*row_limit))
     return 1;
 
-  if (item->sum_func() == Item_sum::JSON_ARRAYAGG_FUNC &&
-      item->arg_count_field > 1)
-  {
-      /* JSON_ARRAYAGG supports only one parameter */
-    my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), "JSON_ARRAYAGG");
-    return 1;
-  }
-
   if (item->no_appended)
     item->no_appended= FALSE;
   else

sql/lex.h

@@ -742,6 +742,7 @@ static SYMBOL sql_functions[] = {
   { "FIRST_VALUE",      SYM(FIRST_VALUE_SYM)},
   { "GROUP_CONCAT",	SYM(GROUP_CONCAT_SYM)},
   { "JSON_ARRAYAGG",	SYM(JSON_ARRAYAGG_SYM)},
+  { "JSON_OBJECTAGG",	SYM(JSON_OBJECTAGG_SYM)},
   { "LAG",              SYM(LAG_SYM)},
   { "LEAD",             SYM(LEAD_SYM)},
   { "MAX",		SYM(MAX_SYM)},

sql/sql_yacc.yy

@@ -1007,6 +1007,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b, size_t *yystacksize);
 %token  <kwd> GRANT                         /* SQL-2003-R */
 %token  <kwd> GROUP_CONCAT_SYM
 %token  <rwd> JSON_ARRAYAGG_SYM
+%token  <rwd> JSON_OBJECTAGG_SYM
 %token  <kwd> GROUP_SYM                     /* SQL-2003-R */
 %token  <kwd> HAVING                        /* SQL-2003-R */
 %token  <kwd> HOUR_MICROSECOND_SYM
@@ -11508,19 +11509,26 @@ sum_expr:
           }
         | JSON_ARRAYAGG_SYM '(' opt_distinct
           { Select->in_sum_expr++; }
-          expr_list opt_glimit_clause
+          expr_list opt_gorder_clause opt_glimit_clause
           ')'
           {
             SELECT_LEX *sel= Select;
+            List<Item> *args= $5;
             sel->in_sum_expr--;
+            if (args && args->elements > 1)
+            {
+              /* JSON_ARRAYAGG supports only one parameter */
+              my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), "JSON_ARRAYAGG");
+              MYSQL_YYABORT;
+            }
             String* s= new (thd->mem_root) String(",", 1, &my_charset_latin1);
             if (unlikely(s == NULL))
               MYSQL_YYABORT;
 
             $$= new (thd->mem_root)
                   Item_func_json_arrayagg(thd, Lex->current_context(),
-                                          $3, $5,
+                                          $3, args,
-                                          sel->gorder_list, s, $6,
+                                          sel->gorder_list, s, $7,
                                           sel->select_limit,
                                           sel->offset_limit);
             if (unlikely($$ == NULL))
@@ -11531,6 +11539,17 @@ sum_expr:
             $5->empty();
             sel->gorder_list.empty();
           }
+        | JSON_OBJECTAGG_SYM '('
+          { Select->in_sum_expr++; }
+          expr ',' expr ')'
+          {
+            SELECT_LEX *sel= Select;
+            sel->in_sum_expr--;
+
+            $$= new (thd->mem_root) Item_func_json_objectagg(thd, $4, $6);
+            if (unlikely($$ == NULL))
+              MYSQL_YYABORT;
+          }
         ;
 
 window_func_expr:

sql/sql_yacc_ora.yy

@@ -472,6 +472,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b, size_t *yystacksize);
 %token  <kwd> GRANT                         /* SQL-2003-R */
 %token  <kwd> GROUP_CONCAT_SYM
 %token  <rwd> JSON_ARRAYAGG_SYM
+%token  <rwd> JSON_OBJECTAGG_SYM
 %token  <kwd> GROUP_SYM                     /* SQL-2003-R */
 %token  <kwd> HAVING                        /* SQL-2003-R */
 %token  <kwd> HOUR_MICROSECOND_SYM
@@ -11608,19 +11609,26 @@ sum_expr:
           }
         | JSON_ARRAYAGG_SYM '(' opt_distinct
           { Select->in_sum_expr++; }
-          expr_list opt_glimit_clause
+          expr_list opt_gorder_clause opt_glimit_clause
           ')'
           {
             SELECT_LEX *sel= Select;
+            List<Item> *args= $5;
             sel->in_sum_expr--;
+            if (args && args->elements > 1)
+            {
+              /* JSON_ARRAYAGG supports only one parameter */
+              my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), "JSON_ARRAYAGG");
+              MYSQL_YYABORT;
+            }
             String* s= new (thd->mem_root) String(",", 1, &my_charset_latin1);
             if (unlikely(s == NULL))
               MYSQL_YYABORT;
 
             $$= new (thd->mem_root)
                   Item_func_json_arrayagg(thd, Lex->current_context(),
-                                          $3, $5,
+                                          $3, args,
-                                          sel->gorder_list, s, $6,
+                                          sel->gorder_list, s, $7,
                                           sel->select_limit,
                                           sel->offset_limit);
             if (unlikely($$ == NULL))
@@ -11631,6 +11639,17 @@ sum_expr:
             $5->empty();
             sel->gorder_list.empty();
           }
+        | JSON_OBJECTAGG_SYM '('
+          { Select->in_sum_expr++; }
+          expr ',' expr ')'
+          {
+            SELECT_LEX *sel= Select;
+            sel->in_sum_expr--;
+
+            $$= new (thd->mem_root) Item_func_json_objectagg(thd, $4, $6);
+            if (unlikely($$ == NULL))
+              MYSQL_YYABORT;
+          }
         ;
 
 window_func_expr: