diff --git a/mysql-test/r/view.result b/mysql-test/r/view.result index 029daa14256..b10d4302776 100644 --- a/mysql-test/r/view.result +++ b/mysql-test/r/view.result @@ -2475,3 +2475,32 @@ alias1 alias2 5 5 drop view v2, v1; drop table t1; +CREATE TABLE t1 (a int PRIMARY KEY, b int); +INSERT INTO t1 VALUES (2,20), (3,10), (1,10), (0,30), (5,10); +CREATE VIEW v1 AS SELECT * FROM t1; +SELECT MAX(a) FROM t1; +MAX(a) +5 +SELECT MAX(a) FROM v1; +MAX(a) +5 +EXPLAIN SELECT MAX(a) FROM t1; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away +EXPLAIN SELECT MAX(a) FROM v1; +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Select tables optimized away +SELECT MIN(a) FROM t1; +MIN(a) +0 +SELECT MIN(a) FROM v1; +MIN(a) +0 +EXPLAIN SELECT MIN(a) FROM t1; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away +EXPLAIN SELECT MIN(a) FROM v1; +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Select tables optimized away +DROP VIEW v1; +DROP TABLE t1; diff --git a/mysql-test/t/view.test b/mysql-test/t/view.test index bfa12a1ee33..3fed763e3af 100644 --- a/mysql-test/t/view.test +++ b/mysql-test/t/view.test @@ -2343,3 +2343,27 @@ order by v2.receipt_id; drop view v2, v1; drop table t1; + +# +# Bug#16016: MIN/MAX optimization for views +# + +CREATE TABLE t1 (a int PRIMARY KEY, b int); +INSERT INTO t1 VALUES (2,20), (3,10), (1,10), (0,30), (5,10); + +CREATE VIEW v1 AS SELECT * FROM t1; + +SELECT MAX(a) FROM t1; +SELECT MAX(a) FROM v1; + +EXPLAIN SELECT MAX(a) FROM t1; +EXPLAIN SELECT MAX(a) FROM v1; + +SELECT MIN(a) FROM t1; +SELECT MIN(a) FROM v1; + +EXPLAIN SELECT MIN(a) FROM t1; +EXPLAIN SELECT MIN(a) FROM v1; + +DROP VIEW v1; +DROP TABLE t1; diff --git a/sql/opt_sum.cc b/sql/opt_sum.cc index 2e87f9cf0db..4158031b9a9 100644 --- a/sql/opt_sum.cc +++ b/sql/opt_sum.cc @@ -180,14 +180,14 @@ int opt_sum_query(TABLE_LIST *tables, List &all_fields,COND *conds) indexes to find the key. */ Item *expr=item_sum->args[0]; - if (expr->type() == Item::FIELD_ITEM) + if (expr->real_item()->type() == Item::FIELD_ITEM) { byte key_buff[MAX_KEY_LENGTH]; TABLE_REF ref; uint range_fl, prefix_len; ref.key_buff= key_buff; - Item_field *item_field= ((Item_field*) expr); + Item_field *item_field= (Item_field*) (expr->real_item()); TABLE *table= item_field->field->table; /* @@ -267,14 +267,14 @@ int opt_sum_query(TABLE_LIST *tables, List &all_fields,COND *conds) indexes to find the key. */ Item *expr=item_sum->args[0]; - if (expr->type() == Item::FIELD_ITEM) + if (expr->real_item()->type() == Item::FIELD_ITEM) { byte key_buff[MAX_KEY_LENGTH]; TABLE_REF ref; - uint range_fl, prefix_len; + uint range_fl, prefix_len; ref.key_buff= key_buff; - Item_field *item_field= ((Item_field*) expr); + Item_field *item_field= (Item_field*) (expr->real_item()); TABLE *table= item_field->field->table; /*