Manually merged

sql/item.cc:
  Auto merged
sql/sql_select.cc:
  Auto merged

mysql-test/r/having.result

@@ -392,3 +392,16 @@ HAVING HU.PROJ.CITY = HU.STAFF.CITY);
 EMPNUM	GRADE*1000
 E3	13000
 DROP SCHEMA HU;
+USE test;
+create table t1(f1 int);
+select f1 from t1 having max(f1)=f1;
+f1
+select f1 from t1 group by f1 having max(f1)=f1;
+f1
+set session sql_mode='ONLY_FULL_GROUP_BY';
+select f1 from t1 having max(f1)=f1;
+ERROR 42000: non-grouping field 'f1' is used in HAVING clause
+select f1 from t1 group by f1 having max(f1)=f1;
+f1
+set session sql_mode='';
+drop table t1;

mysql-test/t/having.test

@@ -393,3 +393,16 @@ SELECT EMPNUM, GRADE*1000
                            HAVING HU.PROJ.CITY = HU.STAFF.CITY);
 
 DROP SCHEMA HU;
+USE test;
+#
+# Bug#18739: non-standard HAVING extension was allowed in strict ANSI sql mode.
+#
+create table t1(f1 int);
+select f1 from t1 having max(f1)=f1;
+select f1 from t1 group by f1 having max(f1)=f1;
+set session sql_mode='ONLY_FULL_GROUP_BY';
+--error 1461
+select f1 from t1 having max(f1)=f1;
+select f1 from t1 group by f1 having max(f1)=f1;
+set session sql_mode='';
+drop table t1;

sql/item.cc

@@ -3137,7 +3137,8 @@ static Item** find_field_in_group_list(Item *find_item, ORDER *group_list)
     both clauses contain different fields with the same names, a warning is
     issued that name of 'ref' is ambiguous. We extend ANSI SQL in that when no
     GROUP BY column is found, then a HAVING name is resolved as a possibly
-    derived SELECT column.
+    derived SELECT column. This extension is allowed only if the
+    MODE_ONLY_FULL_GROUP_BY sql mode isn't enabled.
 
   NOTES
     The resolution procedure is:
@@ -3147,7 +3148,9 @@ static Item** find_field_in_group_list(Item *find_item, ORDER *group_list)
       in the GROUP BY clause of Q.
     - If found different columns with the same name in GROUP BY and SELECT
       - issue a warning and return the GROUP BY column,
-      - otherwise return the found SELECT column.
+      - otherwise
+        - if the MODE_ONLY_FULL_GROUP_BY mode is enabled return error
+        - else return the found SELECT column.
 
 
   RETURN
@@ -3192,6 +3195,17 @@ resolve_ref_in_select_and_group(THD *thd, Item_ident *ref, SELECT_LEX *select)
     }
   }
 
+  if (thd->variables.sql_mode & MODE_ONLY_FULL_GROUP_BY &&
+      select_ref != not_found_item && !group_by_ref)
+  {
+    /*
+      Report the error if fields was found only in the SELECT item list and
+      the strict mode is enabled.
+    */
+    my_error(ER_NON_GROUPING_FIELD_USED, MYF(0),
+             ref->name, "HAVING");
+    return NULL;
+  }
   if (select_ref != not_found_item || group_by_ref)
   {
     if (select_ref != not_found_item && !ambiguous_fields)

sql/share/errmsg.txt

@@ -5615,3 +5615,5 @@ ER_MAX_PREPARED_STMT_COUNT_REACHED 42000
         eng "Can't create more than max_prepared_stmt_count statements (current value: %lu)"
 ER_VIEW_RECURSIVE
         eng "`%-.64s`.`%-.64s` contain view recursion"
+ER_NON_GROUPING_FIELD_USED 42000
+	eng "non-grouping field '%-.64s' is used in %-.64s clause"

sql/sql_select.cc

@@ -12613,6 +12613,10 @@ setup_group(THD *thd, Item **ref_pointer_array, TABLE_LIST *tables,
       if (item->type() != Item::SUM_FUNC_ITEM && !item->marker &&
 	  !item->const_item())
       {
+        /*
+          TODO: change ER_WRONG_FIELD_WITH_GROUP to more detailed
+          ER_NON_GROUPING_FIELD_USED
+        */
 	my_error(ER_WRONG_FIELD_WITH_GROUP, MYF(0), item->full_name());
 	return 1;
       }