Fixed bug MDEV-14368 Improper error for a grouping query that

uses alias in HAVING when sql_mode = 'ONLY_FULL_GROUP_BY'

This patch corrects the patch for bug#18739: non-standard
HAVING extension was allowed in strict ANSI sql mode
added in 2006 by commit 4b7c4cd2.
As a result of incompleteness of the fix in the above commit
if a query with GROUP BY contained an aggregate function with an
alias and this alias was used in the HAVING clause of the query
the server reported an error when sql_mode was set to
'ONLY_FULL_GROUP_BY'.

mysql-test/r/having.result

@@ -697,3 +697,18 @@ id	column_1
 1	80a12660d24a72460e5e292fe33f870276d7f40a
 expected -- 1 row(s) returned not ER_BAD_FIELD_ERROR
 drop table t1;
+#
+# mdev-14368: grouping query with alias for aggregate function in HAVING
+#             when sql_mode = 'ONLY_FULL_GROUP_BY'
+set @save_sql_mode= @@sql_mode;
+set sql_mode = 'ONLY_FULL_GROUP_BY';
+create table t1(a int);
+insert  t1 values (4),(1),(2),(1), (3),(4);
+SELECT a, COUNT(a) as ct FROM t1 GROUP BY a HAVING ct>0;
+a	ct
+1	2
+2	1
+3	1
+4	2
+set sql_mode=@save_sql_mode;
+drop table t1;

mysql-test/t/having.test

@@ -727,3 +727,20 @@ HAVING UPPER(`column_1`) LIKE '8%';
 --echo expected -- 1 row(s) returned not ER_BAD_FIELD_ERROR
 
 drop table t1;
+
+--echo #
+--echo # mdev-14368: grouping query with alias for aggregate function in HAVING
+--echo #             when sql_mode = 'ONLY_FULL_GROUP_BY'
+
+
+set @save_sql_mode= @@sql_mode;
+set sql_mode = 'ONLY_FULL_GROUP_BY';
+
+create table t1(a int);
+insert  t1 values (4),(1),(2),(1), (3),(4);
+
+SELECT a, COUNT(a) as ct FROM t1 GROUP BY a HAVING ct>0;
+
+set sql_mode=@save_sql_mode;
+
+drop table t1;

sql/item.cc

@@ -4771,7 +4771,8 @@ 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->having_fix_field  &&
-      select_ref != not_found_item && !group_by_ref)
+      select_ref != not_found_item && !group_by_ref &&
+      !ref->alias_name_used)
   {
     /*
       Report the error if fields was found only in the SELECT item list and