merged bug 39656 to 5.0-bugteam

mysql-test/r/func_group.result

@@ -1425,4 +1425,27 @@ SELECT AVG(a), CAST(AVG(a) AS DECIMAL) FROM t1;
 AVG(a)	CAST(AVG(a) AS DECIMAL)
 15	15
 DROP TABLE t1;
+CREATE TABLE t1 (a INT, b INT);
+INSERT INTO t1 VALUES (1,1), (1,2), (1,3);
+SET SQL_MODE='ONLY_FULL_GROUP_BY';
+SELECT COUNT(*) FROM t1;
+COUNT(*)
+3
+SELECT COUNT(*) FROM t1 where a=1;
+COUNT(*)
+3
+SELECT COUNT(*),a FROM t1;
+ERROR 42000: Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause
+SELECT COUNT(*) FROM t1 a JOIN t1 b ON a.a= b.a;
+COUNT(*)
+9
+SELECT COUNT(*), (SELECT count(*) FROM t1 inr WHERE inr.a = outr.a) 
+FROM t1 outr;
+ERROR 42000: Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause
+SELECT COUNT(*) FROM t1 a JOIN t1 outr 
+ON a.a= (SELECT count(*) FROM t1 inr WHERE inr.a = outr.a);
+COUNT(*)
+0
+SET SQL_MODE=default;
+DROP TABLE t1;
 End of 5.0 tests

mysql-test/t/func_group.test

@@ -926,5 +926,34 @@ SELECT AVG(a), CAST(AVG(a) AS DECIMAL) FROM t1;
 
 DROP TABLE t1;
 
+#
+# Bug #39656: Behaviour different for agg functions with & without where -
+# ONLY_FULL_GROUP_BY
+#
+
+CREATE TABLE t1 (a INT, b INT);
+INSERT INTO t1 VALUES (1,1), (1,2), (1,3);
+
+SET SQL_MODE='ONLY_FULL_GROUP_BY';
+
+SELECT COUNT(*) FROM t1;
+SELECT COUNT(*) FROM t1 where a=1;
+
+--error ER_MIX_OF_GROUP_FUNC_AND_FIELDS
+SELECT COUNT(*),a FROM t1;
+
+SELECT COUNT(*) FROM t1 a JOIN t1 b ON a.a= b.a;
+
+--error ER_MIX_OF_GROUP_FUNC_AND_FIELDS
+SELECT COUNT(*), (SELECT count(*) FROM t1 inr WHERE inr.a = outr.a) 
+  FROM t1 outr;
+
+SELECT COUNT(*) FROM t1 a JOIN t1 outr 
+  ON a.a= (SELECT count(*) FROM t1 inr WHERE inr.a = outr.a);
+
+SET SQL_MODE=default;
+DROP TABLE t1;
+
+
 ###
 --echo End of 5.0 tests

sql/sql_select.cc

@@ -390,11 +390,21 @@ inline int setup_without_group(THD *thd, Item **ref_pointer_array,
 {
   int res;
   nesting_map save_allow_sum_func=thd->lex->allow_sum_func ;
+  /* 
+    Need to save the value, so we can turn off only the new NON_AGG_FIELD
+    additions coming from the WHERE
+  */
+  uint8 saved_flag= thd->lex->current_select->full_group_by_flag;
   DBUG_ENTER("setup_without_group");
 
   thd->lex->allow_sum_func&= ~(1 << thd->lex->current_select->nest_level);
   res= setup_conds(thd, tables, leaves, conds);
 
+  /* it's not wrong to have non-aggregated columns in a WHERE */
+  if (thd->variables.sql_mode & MODE_ONLY_FULL_GROUP_BY)
+    thd->lex->current_select->full_group_by_flag= saved_flag |
+      (thd->lex->current_select->full_group_by_flag & ~NON_AGG_FIELD_USED);
+
   thd->lex->allow_sum_func|= 1 << thd->lex->current_select->nest_level;
   res= res || setup_order(thd, ref_pointer_array, tables, fields, all_fields,
                           order);